Plasma membranes allow some substances to pass through easily while other substances only pass through very slowly or not at all. For that reason, plasma membranes are said to be ______.
Answers
Plasma membranes are selectively permeable, which means that some substances pass through them with ease while other substances only pass through very slowly or not at all.Plasma membranes, also referred to as cell membranes, are the outermost components of cells.
It is a phospholipid bilayer embedded with proteins that is primarily responsible for controlling what enters and exits cells. They are vital for life since they are involved in cellular activities such as nutrient absorption and waste removal.As a result of the plasma membrane's structure, which is primarily phospholipid bilayer, it is selectively permeable. The plasma membrane is selectively permeable, allowing only specific molecules or ions to pass through. This is important since not all substances should enter or exit the cell, and the membrane ensures that the appropriate materials are transported both into and out of the cell.The plasma membrane's primary constituents, phospholipids, are a vital component of living cells since they are amphipathic, meaning they have a hydrophilic head and hydrophobic tail. This property enables phospholipids to form a bilayer that restricts substances from entering the cell while simultaneously allowing others to pass.
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Related Questions
In a small population of Brazilian natives, the frequency of gene p, responsible for this disease, is 0.3. What must be the frequency of people who are heterozygous for this disease?
Answers
Answer:
Explanation:
According to hardy weinberg
p+q=1
p2+2pq+q2=1
p stands for the dominant genotype
q stands for recessive genotype
pq stands for population that are not homogenous i.e not the same
Given that p=0.3
P2=0.09
q=1-0.3= 0.7
q2=0.49
2pq= 2×0.3×0.7
=0.42
Therefore, the frequency of heterozygous population is 0.42
p2+2pq+q2
0.09+0.42+0.49 = 1
The height above the ground. *
Answers
Answer is
Altitude.
.........
What is an ice age?
a recent increase in the average global temperature near Earth’s surface
a period of time when temperatures across the planet are colder than normal
a characteristic of winter that returns seasonally
the loss of heat in coastal areas from La Niña storms
Answers
Explanation:
What is an ice age?
a recent increase in the average global temperature near Earth’s surface
a period of time when temperatures across the planet are colder than normal
a characteristic of winter that returns seasonally
the loss of heat in coastal areas from La Niña storms
Answer:
a period of time when temperatures across the planet are colder than normal
Explanation:
What chemical feature of carbohydrates makes them a necessary food?
Answers
Answer:
see below
Explanation:
Carbohydrates contain a large amount of energy that can be released quickly inside the body. They are used as fuels to provide the energy for keeping the body alive.
Not yet answered Marked out of 1.00 P Flag question Arrange the following steps of the Biuret assay in the correct order.
A) Thoroughly mix by inversion. B) Measure absorbance and record. C) Prepare 9 standards with BSA and NaOH
D) Add Biuret reagent to all samples. E) Construct a standard curve. F) Allow to stand for 30 minutes. Select one: a. F, C, B, D, A, E b. C, D, A, F, B, E c. A, F, C, B, D, E d. F, A, E, C, D, B e. A, E, F, C, D, B
Answers
The following steps of the Biuret assay need to be arranged in the correct order: Prepare 9 standards with BSA and NaOH Add Biuret reagent to all samples. Allow to stand for 30 minutes.
Thoroughly mix by inversion .Measure absorbance and record .Construct a standard curve. The main answer is option (b) C, D, A, F, B, E. The explanation is as follows: The Biuret assay is a common and simple way to determine protein concentrations in biological samples.
The steps for the Biuret assay are as follows:1) Preparation of 9 standards with BSA and NaOH.2) Add Biuret reagent to all samples.3) Allow to stand for 30 minutes.4) Thoroughly mix by inversion.5) Measure absorbance and record.6) Construct a standard curve.
The correct order of steps for the Biuret assay is C, D, A, F, B, E as given in option (b).
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1. The cestodes or tapeworms have a complex life cycle in which____ are released and pass out of human host in feces. Intermediate host like farm animals become infected via contaminated food and-or water. Humans become host again by consuming ____.
A. proglottids; larvae in undecooked meat
B. fertilized eggs; mature worms in undercooked meat
C. larvae; mature worms in undercooked meat
D. Proglottiids; mature worms in undercooked meat
Answers
Tapeworms have a life cycle in which proglottids are released in feces, farm animals become infected by consuming contaminated food or water, and humans become hosts again by consuming undercooked meat containing larvae. The correct answer to the question is: A. proglottids; larvae in undercooked meat.
The cestodes, also known as tapeworms, have a complex life cycle. In this life cycle, proglottids or segments of the tapeworm are released from the human host and passed out in feces. These proglottids contain fertilized eggs. The intermediate host, such as farm animals, can become infected by ingesting contaminated food or water that contains these eggs. Once inside the intermediate host, the eggs develop into larvae.
Humans can become hosts again by consuming undercooked meat that contains the mature worms. When a person consumes the undercooked meat, the larvae from the meat will develop into mature worms inside their intestines, completing the life cycle of the tapeworm.
The proglottids, containing the fertilized eggs, are released from the human host and passed out in feces. The intermediate host, such as farm animals, become infected by consuming contaminated food or water that contains these proglottids. Humans become hosts again by consuming undercooked meat that contains the larvae. The larvae then develop into mature worms in the human intestines.
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Have you ever experienced swollen lymph nodes when you were sick? Why might this happen?
Answers
Answer:
Yes, swollen lymph nodes are more common than some might think.
Explanation:
The medical terms for swollen lymph nodes are adenopathy or lymphadenopathy.
Lymph nodes play a vital role in fighting off sickness in the body. They act as a filter, trapping bacteria and viruses before they can spread too far.
Lymph nodes typically swell up as a response to bacteria or viruses. Though cancer can be a factor in swelling, it is very rare. Most commonly they are felt right below the corner of the jaw, in the neck. Yet, they are not only in the neck; they are all throughout the body. When they are swollen, they might feel tender or even painful.
State one similarity and one difference between parasitic and predatory modes of feeding
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Answer:
One similarity between parasitic and predatory modes of feeding is that both involve the ingestion of other organisms for nutrition. In both cases, the organisms that do the feeding (the parasites or predators) obtain their food from other organisms (the host or prey), which they consume and use to nourish themselves.
One difference between parasitic and predatory modes of feeding is the relationship between the predator and its prey. In predatory feeding, the predator and its prey are typically separate and distinct organisms, and the predator actively hunts and kills its prey for food. In parasitic feeding, the parasite and its host are typically closely associated, and the parasite typically lives on or inside the host, feeding off of its nutrients or tissues. This relationship between the parasite and its host is often harmful to the host, while the relationship between the predator and its prey is typically not harmful (as long as the predator is not over-consuming its prey).
Describe 3 main organelle differences between plant and animal cells.
Answers
Answer:
chloroplasts, the cell wall, and vacuoles.
Explanation:
HOPE THIS HELPS
Helppppppppp!!!!!!! I don’t know any of this!
Answers
The answer is Polysaccharide, hope this helped :)
if a segment of one side of a dna molecule has 500 adenine bases, how many thymine bases does the other side have? question 3 options: 0 you can't tell from this data. 250 500
Answers
The other side will have 500 thymine bases.
One of the four nucleotide bases of DNA, along with adenine (A), cytosine (C), and guanine, is thymine (T) (G). Thymine nucleotides on one strand of a double-stranded DNA molecule couple with adenine bases on the other strand. DNA and its information is encoded by the order of nucleotide bases.
Adenine (A), thymine (T), and cytosine (C), two nitrogen-containing bases, couple together in typical circumstances. By binding these pairs together, the structure of DNA is created.
Thymine is a pyrimidine nucleobase, also referred to as 5-methyluracil. Thymine is swapped out for the nucleobase uracil in RNA. Albrecht Kossel and Albert Neumann isolated thymine for the first time from calf thymus glands in 1893, hence its name.
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The most efficient type of carbohydrate metabolism is:
a. Fermentation
b. Anaerobic electron transport
c. Aerobic respiration
d. Lactate production
Answers
Answer:
c. Aerobic respiration
Explanation:
Aerobic respiration is the process by which carbohydrates are broken down in the presence of oxygen to produce energy. It is the most efficient form of carbohydrate metabolism because it yields a significantly higher amount of ATP (adenosine triphosphate), which is the main energy currency in cells, compared to other forms of metabolism.
which phase of motosis is this
Answers
Answer:
where is the picture for the question?
In one of the steps of the carbon cycle, a person exhales a molecule of
carbon dioxide (CO2) into the atmosphere. Which of the following is
most likely to happen next to the atom of carbon in this molecule?
A. It may be used as part of a sugar in a plant.
B. It may become part of a protein in an animal.
C. It may be consumed as a fossil fuel is burned.
O D. It may be decomposed into carbon and oxygen by a bacterium.
Answers
Plants need carbon dioxide to create their food
After next to the atom of carbon in this molecule, in carbon cycle it may be used as part of a sugar in a plant.
What is carbon cycle?
The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
During photosynthesis, plants absorb carbon dioxide and sunlight to create fuel—glucose and other sugars—for building plant structures. This process forms the foundation of the fast (biological) carbon cycle.
The carbon cycle describes how carbon moves between the atmosphere, soils, living creatures, the ocean, and human sources. The carbon cycle is the process that moves carbon between plants, animals, and microbes; minerals in the earth.
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where does each strand of DNA from the parent molecule end up?
Answers
DNA replicates itself, so no, unlike what it may seem, parent organisms do not loose their DNA. Before the fecundation process, a cool process similar to miosis happens, it is called meiosis. During meiosis the parent chromosome will duplicate it self and break down each of its 46 chromosomes into 4 different new formed cells, which will become the sperm and egg cells. Each of these egg or sperm cells will be different from eachother, which is how you get siblings that don't look alike, however they will contain a copy of the parent's genetic information.
In conclusion;
In the creation of offspring, the copy of the parent's DNA breaks apart into 4 different pieces which will form sperm or egg cells.
Fluid mosaic model of membrane structureWhich of the following is true of the fluid mosaic model of membrane structure?A)Membranes behave more like a solid than a liquid.B)Lipids can flip from one leaflet to another as easily as they can move laterally in a membrane.C)Proteins can easily move across membranes.D)Proteins can easily move laterally through membranes.
Answers
The answer choice that best fits the question is D) Protein can travel lateraly through membranes with ease.
What does a membrane look like?Mullerian Membranes The body openings that access to the outside are lined with these membranes, also known as mucosae. Mucous membranes line the inside of the digestive tract. Additional examples are the respiratory, reproductive, and excretory systems.
What is a membrane, exactly?All cells have a cell membrane, also known as a plasma membrane, which separates the cell interior from the external environment. The cell is a membrane that surrounds which is optically transparent. The cell membrane regulates the flow of substances from and to the cell.
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7. Cells will generally divide when? *
Answers
Answer:
cells will generally divide when reproduction occurs
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which is the acceptable administration route for Vincristine?
A-intrapertoneal
B-intravenous
C-intravesicular
D- intrathecal
Answers
The acceptable administration route for Vincristine is intravenous (IV). The correct option is B
What is Vincristine ?Leukemia, lymphoma, and sarcoma are just a few of the cancers that are handled by the chemotherapy medication vincristine. Because it is a vesicant, if it seeps out of a vein, it can seriously harm tissue. Vincristine should only be given intravenously for this reason.
The other options are not suitable ways to administer vincristine. To administer medication straight into the abdomen, employ intraperitoneal (IP) administration. Medication is delivered directly into the bladder through intravenous (IV) injection. Medication is delivered directly into the cerebrospinal fluid by intrathecal (IT) injection. Because it might have major side effects such paralysis and nerve damage, vincristine is normally not given through these routes.
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Sorry, but I didn't read the directions for the section 4 discussion board. I already answered them before completing the notes.
Answers
PLEASE HELP
structures found in eukaryotic cells but not in a bacterial cells are?
Answers
Answer:
Bacterial cells do not have a nucleus. They also lack membrane-bound organelles, such as mitochondria or chloroplasts. The DNA of a bacterial cell is also different from a eukaryotic cell.
Explanation:
Eukaryotic cells are by definition those that have a membrane-bound nucleus, a morphological component that is absent from bacterial and archaeal cells.
What is the difference between eukaryotic and prokaryotic cells?Eukaryotic cells are distinguished by numerous membrane-bound structures in addition to the nucleus, including the endoplasmic reticulum, Golgi apparatus, chloroplasts, mitochondria, and others.
Prokaryotic cells lack membrane-bound structures, whereas eukaryotic cells do, including the nucleus.
The existence of mitochondria and chloroplasts, the cell wall, and the makeup of chromosomal DNA are all examples of differences between the cellular structures of prokaryotes and eukaryotes.
Therefore, prokaryotic cells are the name for bacteria's cells. Eukaryotic cells are cells that are found in mammals, plants, and fungi.
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Are mosses a direct ancestor of flowering plants?
Answers
Answer:
Mosses are not a direct ancestor of flowering plants
Explanation:
the diversity of offspring produced by the same parents is enhanced by multiple effects. propose the mechanism through which metaphase i contributes to this diversity. a) the random orientation of tetrads at the metaphase plate. b) the random alignment of homologous chromosomes when they cross over. c) the formation of chiasmata when the homologous chromosomes line up at the equator. d) the formation of a synaptonemal complex during chromosomal synapsis
Answers
The random orientation of tetrads at the metaphase plate contributes to the diversity of offspring produced by the same parents.
The diversity of offspring produced by the same parents is enhanced by multiple effects, including the random orientation of tetrads at the metaphase plate during meiosis I.
During metaphase I, homologous pairs of chromosomes align at the metaphase plate, and the orientation of these pairs is random, resulting in different combinations of maternal and paternal chromosomes in the daughter cells.
Additionally, the random alignment of homologous chromosomes during crossing over and the formation of chiasmata during the alignment of homologous chromosomes at the equator also contribute to the diversity of offspring.
These mechanisms, along with the formation of the synaptonemal complex during chromosomal synapsis, ensure that each offspring is genetically unique.
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The mechanism through which metaphase I contributes to the diversity of offspring produced by the same parents is the random orientation of tetrads at the metaphase plate.
During metaphase I of meiosis, homologous chromosomes form bivalents or tetrads, consisting of four chromatids, and align at the metaphase plate. The orientation of each bivalent is random, with the maternal and paternal chromosomes aligning randomly on either side of the metaphase plate. This leads to a random assortment of maternal and paternal chromosomes into the daughter cells, resulting in genetic diversity. The other options (b, c, d) are also mechanisms that contribute to genetic diversity during meiosis but are not directly related to metaphase I.
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what do the data suggest about how related Turtles are to humans compared to tuna and chimpanzees
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The data suggest that Turtles are less evolutionary related to humans when compared to chimpanzees and closer compared to tunes since amino acid differences account for the term divergence between species.
What does the term divergence between species mean in evolution?The term divergence between species in evolution makes reference to the difference between species in a given homolog protein sequence and or any other feature derived from a common ancestor. In this case, we can see that the aminoacid differences are higher between humans and tunas, thereby these species are evolutionary distant when compared to chimpanzees and also compared to humans and turtles (mammals and reptiles are evolutionary closer compared to tunas).
Therefore, with this data, we can see that the term divergence between species is based on the presence of homologies between individuals due to a common ancestor such as occurring between species.
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Please help i need it for tommorow
which bacteria lives in our intestine and help us in digestion?
Answers
Answer:
There are four dominant bacterial phyla that live in our intestine and help us in digestion They are, Firmicutes, Bacteroidetes, Actinobacteria, and Proteobacteria.
Question 7 of 10
A certain plant has a color that can range from green to yellow. Some plants
are very green, and some are very yellow, but most are in between. What is
most likely true about this trait?
A. The color is a Mendelian trait.
B. There are several genes that control the color.
C. There are only two alleles for color.
D. Being yellow is a recessive trait.
Answers
Answer:
B. There are several genes that control the color.
Explanation:
According to the description of the trait in this question in which the plant exhibits a wide range of colors from green to yellow, it shows that the trait for color in such plant is controlled by two or more (several) genes. This kind of inheritance is called a POLYGENIC INHERITANCE.
Polygenic inheritance is a kind of non-mendelian inheritance (does not follow the principles of Mendel) in which phenotypic traits of an organism is controlled by several genes. Each gene possess two alleles, which equally contribute to the phenotypic expression of such trait. Traits controlled by polygenes do not conform to Mendel's laws of inheritance as the offsprings exhibit a range of traits from the mixture of parental traits as stated in the question.
In polygenic inheritance, most of the offsprings exhibit the intermediate phenotype (between green and yellow) with few extremes (green and yellow) due to a combination of the genes in the parental phenotypes. Hence, based on the description in the question, there are several genes that control the color trait in the plant.
Answer: B. There are several genes that control the color.
Explanation:
i got it right on the test
Some form of early Homo is estimated to have evolved into Homo erectus around: O 5-7.5 million years ago
O 1.7-2 million years ago O 10,000-40,000 years ago O 50,000-70,000 years ago t
Answers
Some form of early Homo is estimated to have evolved into Homo erectus around 1.7-2 million years ago, option B is correct.
Homo erectus is believed to have evolved around 1.7-2 million years ago based on fossil evidence and dating methods. Fossil discoveries, such as the famous Nariokotome Boy skeleton found in Kenya, provide crucial insights into the anatomy and characteristics of Homo erectus. These fossils, along with other archaeological and genetic evidence, suggest that Homo erectus was the first hominin species to exhibit significant anatomical and behavioral differences from earlier hominins.
The emergence of Homo erectus marked a significant milestone in human evolution, as this species had a larger brain size, more advanced tool-making abilities, and potentially even the ability to control fire. These developments laid the foundation for the subsequent evolution of Homo sapiens, option B is correct.
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The complete question is:
Some form of early Homo is estimated to have evolved into Homo erectus around:
A) 5-7.5 million years ago
B) 1.7-2 million years ago
C) 10,000-40,000 years ago
D) 50,000-70,000 years ago
You are looking at a cell under a microscope and trying to determine whether it is a prokaryote or a eukaryote. You know it is a eukaryote if you see:
a. DNA
b. a plasma membrane
c. a nucleus
d. a cell wall
Answers
Answer:
c
Explanation:
prokaryotes don't have a nucleus
The town council votes to construct an energy plant on the bank of a large river. It uses river water in its cooling tanks and releases the wastewater back into the river. How might this activity affect the local watershed?
I. The energy plant will likely flood the area during heavy rainfall.
II. The energy plant will likely pollute the water flowing in front of it on the riverbank
III. The energy plant will stop all water flowing through the watershed.
II only
I and III
II and III
I, II, and III
Answers
The construction of the energy plant will likely pollute the water flowing in front of it on the riverbank.
The fact that the energy plant will use the water from the river for cooling means that the water will be exposed to thermal pollution. The increase in the temperature of the water will cause less dissolution of oxygen in the water.
As dissolved oxygen levels drop, the aquatic organisms in the river will become negatively affected due to the resulting oxygen stress and they may begin to die.
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In the following diagram of boiling water, what is causing the rising and sinking of the water?
A electromagnetic radiation from the atmosphere
B the insulation of water due to its high heat capacity
C convection from the movement of liquids and gases
D conduction from the fire underneath the pot
Answers
Answer:
B.
Explanation:
the insulation of water due to its high heat capacity
respiration involves the movement of gases by the process of____
Answers
Respiration involves the movement of gases by the process of diffusion.
Respiration is basically the process of release of energy which is by breaking down food into simpler molecules which are then stored in the body cells. The process, by the help of which air is basically drawn into the lungs and then is forced out from the lungs back outside that is into the atmosphere is called breathing.
Breathing takes place in the lungs in humans especially at the alveoli where the exchange between the oxygen and the carbon dioxide takes place with the help of a process which is known as diffusion.
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