The complex external covering composed of two or three layers found on the majority of bacteria is termed the cell?
Answers
The complex external covering composed of two or three layers found on the majority of bacteria is termed the cell envelope.
Bacteria are the prokaryotic microorganisms that cannot be seen through unaided eyes. These are omnipresent creatures that can be visualized only under a microscope. The examples of bacteria are: E. coli, Helicobacter pylori, Lactobacillus, etc.
Cell envelope is the outermost layer that gives the cell its structure integrity and also protects the cell. The envelope is composed of three layers: cell membrane, cell wall and an outer membrane (if present). The envelope is also involved in the cell growth and division.
To know more about cell envelope, here
brainly.com/question/28231946
#SPJ4
Related Questions
You are studying a plant. Most of the cells in the plant (99 percent) have been found to contain 10 chromosomes. However, you have found in certain parts of the plant the cell containing 5 chromosomes. How could you explain your findings?
Answer choices:
A) Plant reproductive cells are produced by meiosis and cells containing 5 chromosomes are body cells produced by mitosis
B) Plant reproductive cells are produced by mitosis and cells containing 5 chromosomes are body cells produced by meiosis
C) Plant body cells are produced by mitosis and cells containing 5 chromosomes are reproductive cells produced by meiosis
D) Plant body cells are produced by meiosis and cells containing 5 chromosomes are reproductive cells produced by mitosis
Answers
The correct explanation can be "Plant body cells are produced by mitosis and cells containing 5 chromosomes are reproductive cells produced by meiosis".
What is meant by meiosis?
It is a special type of cell division occurs in sexually reproducing organisms that reduces the number of chromosomes in the gametes to half of the parent cell and producing four haploid cells.
Generally, Plants undergo mitotic cell division to produce diploid parts like stem, leaf etc. But they use meiotic cell division to produce haploid parts that ultimately results in the production of egg and sperm cells which are haploid.
Both pollen mother cells and megaspore mother cells undergo meiotic division to produce sperm cells and egg for the continuation of generation. During meiotic division chromosomes are reduced to half of the parent cell.
Hence, certain parts of the plant undergo meiotic division to produce gametes and this result in the reduction of chromosomes to 5 whereas most of the parts of the plant which undergo mitotic division have 10 chromosomes.
Learn more about meiotic division from the link given below:
https://brainly.com/question/1169672
#SPJ1
Tell me more about the parts of the water cycle and how they work.
Answers
Answer:
QUESTION:
Tell me more about the parts of the water cycle and how they work.
ANSWER:
The water cycle consists of three major processes: evaporation, condensation, and precipitation. ... In the water cycle, liquid water (in the ocean, lakes, or rivers) evaporates and becomes water vapor. Water vapor surrounds us, as an important part of the air we breathe. Water vapor is also an important greenhouse gas.
Explanation:
Hope that this helps you out! :)
If any questions, please leave them below and I will try my best and help you.
Have a great rest of your day/night!
Please thank me on my profile if this answer has helped you!
Lesson 05.01 Evolution
Identify early ideas about evolution
Discuss theories that influenced scientific debate over evolution
Recognize the major sources of evidence for evolution
Recognize the pattern of features that reveal the history of a species
Answers
1. Early ideas about evolution:
Ancient Greek philosophers, such as Empedocles and Anaximander, proposed early ideas about the development and transformation of life forms.In the 18th century, naturalists like Jean-Baptiste Lamarck suggested theories of transmutation, proposing that species could change over time through the inheritance of acquired traits.2. Theories that influenced scientific debate over evolution:
Jean-Baptiste Lamarck's theory of inheritance of acquired characteristics proposed that traits acquired during an organism's lifetime could be passed on to the next generation.Charles Darwin's theory of natural selection, outlined in his book "On the Origin of Species" (1859), suggested that favorable variations in organisms' heritable traits would increase their chances of survival and reproduction, leading to the gradual evolution of species over time.Gregor Mendel's work on inheritance and genetics in the 19th century provided a foundation for understanding how traits are passed on through generations.3. Major sources of evidence for evolution:
Fossil record: Fossils provide evidence of organisms that lived in the past and show the progression and changes in species over time.Comparative anatomy: Similarities and differences in anatomical structures across different species provide evidence of common ancestry and evolutionary relationships.Biogeography: The distribution of species around the world can be explained by evolutionary processes, such as continental drift and the movement of organisms across geographic barriers.Embryology: The study of the development of embryos reveals similarities in early stages among different species, suggesting a common ancestry.Molecular biology: Comparisons of DNA, proteins, and other molecules across different organisms provide evidence of shared genetic information and evolutionary relationships.4. Pattern of features revealing the history of a species:
Phylogenetic relationships: By comparing the characteristics of different species and constructing phylogenetic trees, scientists can infer the evolutionary history and relationships between species.Homologous structures: Similar structures found in different species, such as the forelimbs of vertebrates, suggest a common ancestry and shared evolutionary history.Vestigial structures: Rudimentary or non-functional structures in organisms that serve no purpose but have functional counterparts in other species provide evidence of shared ancestry and evolutionary change.Fossil record: Fossils reveal the succession of different species over time, showing patterns of extinction, appearance, and transformation.These concepts and lines of evidence collectively support the understanding of evolution and provide insights into the history and development of species over millions of years.
Learn more about evolution:
https://brainly.com/question/27748371
please help, it’s due tomorrow.
Answers
Answer:
1. You know I was like I was just going through a rough time right here is the only one that
2.Eteydsbc K Michelle and you can do is get it
if a researcher was interested in slowing down the movement of amoebas by disrupting their cell membranes, which protein filaments should she be studying?
Answers
To slow down the movement of amoebas by disrupting their cell membranes, a researcher should be studying the actin filaments.
One of the key parts of the cytoskeleton, which keeps cells in their proper shapes and supports them structurally, are actin filaments. Actin filaments perform these tasks as well as assisting in the development of pseudopodia, which are movements used by amoebas. Pseudopodia are extensions of the cell membrane.
The production of pseudopodia by amoebas could be impacted by cell membrane disruption, which in turn could have an impact on how they travel. Actin filaments are essential for cell mobility and serve a crucial role in the development of pseudopodia. Therefore, by preventing amoebas from forming pseudopodia, interrupting the actin filaments could limit their motility.
To know more about amoebas click here
brainly.com/question/1217776
#SPJ4
Which of the following statements about marriage prohibitions in the United States is correct? Consanguineous unions (fist-cousin marriage) show an increase of more than 8 percent in predicted birth defects of offspring Cousin prohibitions in marriage were enacted by law in the United States long before genetic research began. Inbreeding was considered a sign of family viability and success in the United States in the early 1900s. There is a lower risk of birth defects in offspring from women who are older than 50 years than in first-cousin marriages.
Answers
The correct statement regarding marriage prohibitions in the United States is that consanguineous unions (fist-cousin marriage) show an increase of more than 8 percent in predicted birth defects of offspring.
According to genetic research, marriages between cousins are associated with an increase of more than 8 percent in predicted birth defects of offspring. Many states in the United States have banned first-cousin marriage due to the high probability of birth defects, such as Alabama, California, Florida, and so on. While it is legal in a few states, it is only permitted under specific conditions, such as medical counseling. Consequently, consanguineous marriages are discouraged in the United States because of the increased risk of genetic anomalies.
The state of being related by blood is known as consanguinity, and the terms consanguineous relationships or unions are used to describe relationships between relatives who are related by blood.
Know more about consanguineous unions, here:
https://brainly.com/question/545744
#SPJ11
In your biology class, your final grade is based on several things: a lab score, score on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 30% of your total grade, each major test is worth 22.5%, and the final exam is worth 25%. Compute the weighted average for the following scores: 92 on the lab, 85 on the first major test, 90 on the second major test, and 84 on the final exam. Round your answer to the nearest hundredth.
Answers
A weighted average is a statistical measure that considers the relative importance of each value to calculate the final average.
In this problem, the weighted average score for the four scores will be calculated as given below:Given:L = 92 (lab score)T1 = 85 (score on the first major test)T2 = 90 (score on the second major test)F = 84 (score on the final exam)Weightage of lab score = 30% = 0.3 Weightage of each major test score = 22.5% = 0.225Weightage of the final exam score = 25% = 0.25
Weighted score of lab = 92 × 0.3 = 27.6 Weighted score of first major test = 85 × 0.225 = 19.125 Weighted score of second major test = 90 × 0.225 = 20.25Weighted score of final exam = 84 × 0.25 = 2 Total weighted score = 27.6 + 19.125 + 20.25 + 21 = 87.975 (out of 100)Therefore, the weighted average score is 87.98 when rounded to the nearest hundredth.
To know more about statistical measure visit:-
https://brainly.com/question/17516934
#SPJ11
select characteristics exhibited by most bacteria and archaea to test your understanding of the differences between these microbes and eukaryotic organisms.
Answers
Some characteristics exhibited by most bacteria and archaea to test understanding of the differences between these microbes and eukaryotic organisms are nuclear membrane, ribosomes, membrane bound organelles, cell wall structure and size.
Bacteria and archaea comes under the prokaryotic organisms which are different in fundamental ways with the eukaryotic organisms.
The bacteria and archaea have smaller size as compared to eukaryotes. The prokaryotes have no defined nucleus and membrane bound organelles while eukaryotes have.
The cell wall structure of prokaryotes are more complex as compared to eukaryotes. The ribosomes in prokaryotes are smaller as compared to eukaryotes.
To learn more about eukaryotes here
https://brainly.com/question/4644590
#SPJ4
The element nitrogen is present in all of the following except A) proteins.B) nucleic acids.C) amino acids.D) DNA.E) monosaccharides.
Answers
Nitrogen is present in all of the options listed except for monosaccharides. Thus, correct option is (E).
A crucial component of biological compounds is nitrogen. Nitrogen is a component of proteins, nucleic acids (DNA and RNA), amino acids (which serve as the building blocks for proteins), and DNA. Amino acids, which make up proteins, contain nitrogen as a necessary part of their structure.
Adenine, cytosine, guanine, and thymine/uracil are nitrogenous bases that are essential for the operation of nucleic acids, including DNA. Monosaccharides, simple sugars and the fundamental unit of carbohydrates, do not, however, include nitrogen. Instead, the majority of their atoms are made up of carbon, hydrogen, and oxygen.
To know more about Nitrogen here https://brainly.com/question/11483365
#SPJ4
Are there possible risks/harms that the genetic engineering process can cause to the public? How could this be prevented/minimized? How would humans benefit from this process?
Answers
Answer:
Harms: May cause nasty diseases and all sorts of bad things if not engineered properly.
We would benefit by basically being where we are now. We used a lot of genetic engineering to get our technology to the point it is now.
Explanation: Kind of hard to turn back from genetic engineering as it is a potentially useful process.
Which of the following is a major reason that many people are against damming up rivers for human use? A) dams create floods B) dams are not aesthetically pleasing to the community C) dams affect the aquatic organisms and surrounding ecosystem D) dams prevent the use of water for hydroelectric power
Answers
Answer:
i feel as if the answer would be C or D
Explanation:
Because the first two isnt really that abd but dams ruin the water and people want that to themselves if that makes sense
A major reason that many people are against damming up rivers for human use is because dams affect the aquatic organisms and surrounding ecosystem. T Option C. his is further explained below.
What is a Dam?A Dam built to hold back and elevate the level of water, producing a reservoir used to produce energy or as a water source.
In conclusion, Many individuals are opposed to damming rivers for human use because dams harm aquatic species and the surrounding ecology.
Read more about Humans
https://brainly.com/question/18540902
#SPJ2
why are metamorphic rocks denser then igneous rocks
Answers
Answer:
Metamorphic rocks are denser than igneous rocks, because of the way they are formed. To explain:
Metamorphic rocks are formed when all types of rocks are compressed under high temperature and pressure. Having been compressed under high pressure, they become denser.
Igneous rocks, however are formed when magma freezes. It could just freeze when it reaches a slightly colder area and is not affected by the pressure at all. Or if it was, it wouldn't be igneous anymore.
Hope this helps
HELP!!!! A single-celled protozoan with a selectively permeable membrane is placed in a hypertonic glucose solution. Which statement correctly describes the movement of molecules?
A. The cell actively transports glucose into the cell
B. The glucose enters the cell through diffusion
C. There is a net gain of water into the cell through osmosis
D. The cell is in dynamic equilibrium for the water molecules
Answers
Answer: The answer is B
Hope this helps.
a single-celled protozoan with a selectively permeable membrane that is placed in a hypertonic glucose solution. so the glucose will enter the cell by diffusion. Option B is the correct answer.
What is the tonicity of the solution and how does glucose enter in cell?Solvent and solute combine to form a solution. Depending upon the concentration of solute, the solution is of three types: hypertonic solution, hypotonic solution, and isotonic solution. The solute concentration in a hypotonic solution is less than the solvent concentration. The solute concentration in a hypertonic solution is greater than the solvent. In an isotonic solution, both the solute and solvent concentrations are equal.
When the cell is placed in a hypertonic glucose solution, the cell takes glucose into the cell by certain transporters or channels. Glucose is a polar molecule that cannot easily pass through the membrane. Hence, there are many transporters and channels present in the cell membrane. The movement of glucose is called "facilitated diffusion." No energy is required.
Hence, option B is the correct answer, as the glucose is diffused.
To learn more about glucose entry in cell, refer to the following link
https://brainly.com/question/27949019
#SPJ5
describe the primary function of glucose in cells
Answers
Answer:
The primary function of glucose is to serve as a biological fuel source for the body. All cells of the body are capable of using glucose to generate energy. Through a series of complex biochemical reactions, the breakdown
Explain why some parts of the plant must have sucrose delivered to them
Answers
Some parts of the plant, such as roots, flowers, and fruits, do not photosynthesize and therefore rely on sucrose delivery from photosynthetic tissues to provide them with energy.
What is photosynthesis?Sucrose, which is a type of sugar, is a key source of energy for the plant. During photosynthesis, plants produce glucose, which is converted to sucrose for transport to other parts of the plant. Sucrose is a crucial molecule for plant growth and development, and it is required in all parts of the plant that carry out metabolic processes, such as respiration and cell division.
Some parts of the plant, such as the roots and developing flowers or fruits, may not have access to sunlight or may have limited ability to produce their own sucrose through photosynthesis. In these cases, sucrose must be delivered to these parts of the plant from other areas where it is produced, such as the leaves. The transport of sucrose throughout the plant is facilitated by specialized cells and tissues, such as phloem, which form a network of tubes and channels that connect different parts of the plant.
Learn more about photosynthesis, here;
https://brainly.com/question/29764662
#SPJ9
How do you mathematically represent chromosomes?
Answers
Traditionally, chromosomes are represented in binary as strings of 0s and 1s, however other encodings are also possible; almost any representation which allows the solution to be represented as a finite-length string can be used.
☆...hope this helps...☆
_♡_mashi_♡_
Explanation:
All chromosomes must be completely replicated prior to cell division, a requirement that demands the activation of a sufficient number of appropriately distributed DNA replication origins. Here we investigate how the activity of multiple origins on each chromosome is coordinated to ensure successful replication. We present a stochastic model for whole chromosome replication where the dynamics are based upon the parameters of individual origins. Using this model we demonstrate that mean replication time at any given chromosome position is determined collectively by the parameters of all origins. Combining parameter estimation with extensive simulations we show that there is a range of model parameters consistent with mean replication data, emphasising the need for caution in interpreting such data. In contrast, the replicated-fraction at time points through S phase contains more information than mean replication time data and allowed us to use our model to uniquely estimate many origin parameters. These estimated parameters enable us to make a number of predictions that showed agreement with independent experimental data, confirming that our model has predictive power. In summary, we demonstrate that a stochastic model can recapitulate experimental observations, including those that might be interpreted as deterministic such as ordered origin activation times
Why does the cycle that occurs during the AIDS stage of HIV infection cause increasingly severe symptoms ?
Answers
During the Guides phase of HIV disease, the insusceptible framework turns out to be seriously compromised, prompting a pattern of progressively extreme side effects. This cycle happens because of the accompanying elements:
Declining CD4+ Lymphocytes: HIV explicitly targets and obliterates CD4+ White blood cells, which assume a pivotal part in planning a safe reaction. As the infection duplicates and contaminates more CD4+ Lymphocytes, their numbers decline, debilitating the insusceptible framework's capacity to actually ward off diseases and sicknesses.
Pioneering diseases: With a debilitated insusceptible framework, people with Helps become defenseless to deft contaminations. These are contaminations brought about by organic entities that normally don't cause extreme disease in individuals with sound safe frameworks. Deft contaminations can go from bacterial, viral, parasitic, and protozoal diseases. These diseases can be extreme, relentless, and testing to treat, adding to the deteriorating of side effects.
Industrious aggravation: Persistent safe actuation and irritation are signs of HIV contamination. The continuous insusceptible reaction and aggravation further harm the safe framework and imperative organs after some time. This tireless irritation can prompt the advancement of unexpected complexities, like cardiovascular illness, neurological issues, and certain malignant growths, which add to the movement of side effects.
HIV transformations and viral variety: HIV has a high change rate, prompting the improvement of viral variations that can dodge the safe framework and antiretroviral treatments. As the infection advances, it turns out to be harder to control and treat, adding to the deteriorating side effects and treatment challenges.
Generally speaking, the pattern of progressively extreme side effects during the Guides phase of HIV contamination is driven by the dynamic obliteration of the safe framework, powerlessness to shrewd contaminations, persevering aggravation, and viral changes that compromise the body's capacity to protect against contaminations and illnesses.
Read more about AIDS progression at:
https://brainly.com/question/15604048
What is the correct order for respiration?
Answers
2. Krebs cycle
3. Electron transport chain
Where does the energy come from to make NADPH in the light reactions?
A. From the potential energy of ADP molecules
B. From the energy stored in light
Ο Ο Ο Ο
C. From the energy stored by the Calvin cycle
D. From the energy released by ATP molecules
Answers
Answer:
C Is biomass in the rainforest an energy source or energy sink
Explanation:
Answer:
B. From the energy stored in light.
FORENSIC SCIENCE AND WILL MARK BRAINLIEST!
A virtospy is performed to determine whether the victim had any drugs in their system at the time of death.
A. TRUE
B. FALSE
2. The manner of death refers to the way a person was killed, such as poisoning or gunshots.
A. TRUE
B. FALSE
Answers
Answer:
2:A other i don't know.....
A scientist compares the plasma membrane composition of an animal from the mediterranean coast with one from the mojave desert. Which hypothesis is most likely to be correct?.
Answers
The cells from the Mediterranean animal will have a low cholesterol concentration in the plasma membranes to the animal from mojave deserts.
The environment is the reason for the validity of this hypothesis. The animal in the Mojave Desert lives in a hot climate, but the animal on the Mediterranean coast lives in a cold climate. The plasma membrane is frequently impacted by temperature because it is composed of phospholipids with a hydrophobic internal fatty acid chain and hydrophilic ends. So, fluid changes inside plasma membranes occur in these ways. The first is the temperature. Plasma membranes will become less fluid as temperatures drop, as the components of the membranes become more firmly packed together. They will normally become more fluid as the temperature rises.
Another consideration is the ratio of saturated to unsaturated fatty acids. Plasma membrane membranes are found in the hydrophobic fatty acid chains. If these fatty acids are saturated, their chains will be straight, and at cooler temperatures, they will compress together limiting fluidity. These chains, however, will have kinks if they are unsaturated. And at lower temperatures, the gaps between these kinks caused by air will keep them fluid. Thus, cholesterol concentration is high in animals of hot temperature because they are not packed but free to move and are saturated.
To learn more about the function of cholesterol in plasma membrane. Click, https://brainly.com/question/13450754
#SPJ4
What are 3 point mutations examples?.
Answers
There are three types of point mutations: deletions, insertions, and substitutions. Deletions happen when a nucleotide is removed. Insertions occur when a new nucleotide is added to the genome. Substitutions occur when one nucleotide is exchanged for another.
Which is the best example of mutation?
Cystic fibrosis is an example of a genetic disorder. A single gene mutation causes the body to produce thick, sticky mucus, which clogs the lungs and blocks ducts in digestive organs. Cancer is a disease in which cells proliferate uncontrollably and form abnormal cell masses (called tumors).
What exactly is a point mutation, and how does it happen?
A point mutation is a single base change in DNA. It can occur as a result of natural replication errors or from exposure to carcinogens, which are substances that can cause mutations.
Learn more about point mutations to visit this link
https://brainly.com/question/15870401
#SPJ4
what is carbon used for in each sphere?
Answers
Answer:
Carbon is found in the hydrosphere dissolved in ocean water and lakes. Carbon is used by many organisms to produce shells.
Explanation:
1. Why would immune cells be an important part of tissue repair?
2. A strange experiment can help to show the differences between scar tissue and normal skin tissue. If you were to throw flour on the man in the photo, the flour would stick to the man's chest everywhere but on his scar. Give a possible explanation for this.
Answers
Immune cells, such as white blood cells, play an important role in tissue repair by identifying and removing damaged or infected cells and promoting the growth and differentiation of new cells. Additionally, immune cells release molecules known as growth factors that stimulate the production of new blood vessels, which is important for the delivery of oxygen and nutrients to the repair site.
2. The difference in the way flour sticks to the man's chest in the photo may be due to the fact that scar tissue is composed of different types of collagen than normal skin tissue. Collagen is a protein that gives skin its structure and strength. In scar tissue, the collagen fibers are arranged in a different pattern than in normal skin, which can affect the way that other substances, such as flour, interact with the tissue.
What is the tissue repair?Tissue repair is a complex process that involves multiple stages and multiple cell types. The process begins with an inflammatory response, which is triggered by injury or damage to the tissue.
Next, the proliferation stage begins, in which new cells, such as fibroblasts and blood vessel cells, are produced and migrate to the repair site.
In the maturation stage, the extracellular matrix molecules are organized and remodeled to create a functional tissue that is similar in structure and function to the tissue that was damaged.
Finally, in the remodeling stage, the repair tissue is further strengthened and optimized to match the surrounding tissue. This process may take several weeks to months, depending on the size and location of the injury.
Learn more about tissue repair from
https://brainly.com/question/28525365
#SPJ1
The pull of Jupiter on its moons is a _________ force.
Answers
Answer:
the answer will be the Contact
Explanation:
hope this helps youWhere are waste materials broken down in an animal cell?
Answers
explanation: Lysosomes break down cellular waste products, fats, carbohydrates, proteins, and other macromolecules into simple compounds, which are then transferred back into the cytoplasm as new cell-building materials.
after so many failed attempts at school, why was Charles Darwin's finally successful studying at Cambridge
Answers
Charles Darwin's finally successful studying at Cambridge because he was finally able to peruse in his learning by having an interest in this subject.
Who was Charles Darwin?He was an English naturalist who is now regarded as the father of modern evolution as a result of his various findings.
He initially struggled in school but after many failed attempts, he had interest in the subject which made learning easier.
Read more about Charles Darwin here https://brainly.com/question/1279802
#SPJ1
In carnations, the alleles for flower color exhibit incomplete dominance. Red
flowers have the RR genotype. Pink flowers have the RW genotype. White
flowers have the WW genotype.
If a red flower and a pink flower are crossed, what is the expected genotypic
ratio of their offspring?
A. 2 RR:2 RW:0 WW
B. 1 RR: 3 RW:0 WW
C. O RR:2 RW: 2 WW
D. 1 RR:2 RW: 1 WW
Answers
D. 1 RR:2 RW: 1 WW
This means that for every offspring, there would be one with the RR genotype (red flower), two with the RW genotype (pink flower), and one with the WW genotype (white flower).
What regulates the flow of water through a cell membrane
Answers
Answer:
osmosis? I hope I'm right
Answer:
1. osmosis 2. tonicity 3. hydrostatic pressure.
Explanation:
at what phase of the cell cycle does a cell conduct its usual functions in the body? group of answer choices g1 s cytokinesis g0 g2
Answers
A normal cell spends the majority of its time in interphase, which is the phase of the cell cycle. The metabolic phase of the cell is known as interphase. During this time, the cell acquires nutrients and metabolises them, expands, and repeats its DNA in order to be ready for mitosis.
What occurs during the G1 G2 and S phases?The cell physically expands when in the G1 phase and produces more organelles and protein. The cell duplicates its nucleosomes and copies its DNA to create two sister chromatids during the S phase. Finally, the G2 phase involves continued cell development and cellular content organisation.
The majority of cellular development occurs in G1; cells increase in size and produce the proteins and organelles necessary for DNA synthesis.
learn more about G1 phase refer
https://brainly.com/question/11779221
#SPJ4