how many nucleolus can a single cell have?
Answers
Answer:
five nucleoli
Explanation:
step by step explanation
Related Questions
thomas malthus and others predicted that surpassing a threshold population size would bring about catastrophic collapse. explain how humans have managed to increase the carrying capacity of the planet for our species in order to prevent collapse.
Answers
The "carrying capacity" of the Earth, or the most people it can sustain permanently, is still a matter of debate among scientists, with estimates varying considerably between 500 million to more than one trillion.
Why did Thomas Malthus think the population would outpace growth?Thomas Malthus discovered that food production rose more gradually rather than exponentially. Malthus projected that the human population will ultimately become too high to be adequately maintained by the food supply due to these variations in population and food growth rates.
What remedies did Malthus propose to deal with the overpopulation?Malthus suggested "moral constraint" as a remedy. In other words, he mandated forced sterilization when necessary, abstinence before to marriage, and the imposition of harsh penalties on so-called unprepared parents who had more children than they could sustain.
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Fossil fuel dependence has an impact on which of the following?
A)
the environment
B)
economics
C)
poverty
D)
international security
E)
all of the above
Answers
When a sperm and egg combine, it is called
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what is the difference between a thymine dimer and two thymine nucleotides next to each other who are joined properly.
Answers
Answer:
Thymine dimer and two thymine nucleotides next to each other that are joined properly are two different molecular structures that have distinct biological implications.
Thymine dimer refers to a type of DNA damage that occurs when two adjacent thymine nucleotides become covalently bonded to each other, instead of being properly paired with their complementary nucleotides (adenine). This type of damage is usually caused by exposure to UV radiation and can lead to errors in DNA replication and transcription, potentially causing mutations and cell death.
On the other hand, two thymine nucleotides next to each other that are joined properly refers to the normal, stable pairing of thymine nucleotides with their complementary nucleotide, adenine, through hydrogen bonding. This correct pairing is crucial for the proper replication and transcription of DNA, and any errors in this process can cause genetic mutations and diseases.
In summary, thymine dimer and two thymine nucleotides next to each other that are joined properly are two distinct molecular structures with different biological implications. The former is a type of DNA damage that can lead to mutations and cell death, while the latter is a normal and essential feature of DNA structure and function.
Which two systems are the kidney, bladder, colon, stomach, and small intestines associated with?
Answers
Explanation:
(idk why i can't comment under ur answer in my post) but yess i do like them, can i have your snap? bc it's easier to talk there
You have carried out a genetic screen and isolated two pure-breeding lines of zebrafish with abnormal tail fin shapes. Both of the abnormal phenotypes are inherited in a recessive fashion. What is the easiest way to tell whether these two lines have mutations in the same gene or in two different genes?.
Answers
A complementation test is the simplest approach to determine if the mutation that causes aberrant phenotypes and is inherited recessively is in the same gene or in two distinct genes.
A mutation is a change in the regular sequence of genes. It could take the shape of deletion, addition, duplication, reversion, and so on. In general, mutations have negative consequences, although certain mutations have no effect at all. Silent mutations are such mutations.
The complementation test is performed to evaluate if the mutations are caused by the same version of a gene or by two separate genes. In this experiment, two mutants are crossed and their F1 progeny are observed. If the wild type attribute arises, the mutation could occur in two separate genes.
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Which of the following is/are example(s) of lymphocytes? Question 6 options: 1) antibodies 2) B-cells 3) T-Cells 4) T and B-cells
Answers
b) cuz(my instinct says so)
B cells and T cells are examples of lymphocytes. So the correct option is D.
What are lymphocytes?Lymphocytes are a kind of white blood cells that are an indispensable part of the immune system. The lymphocytes are produced by the bone marrow.
Most of the lymphocytes produced by the bone marrow enter the blood. The remaining lymphocytes enter the lymphatic system. The lymphatic system includes the tonsils, spleen, and lymph nodes.
B cells are formed from 25% of the new lymphocytes produced and the remaining 75% of cells result in the formation of the T cells.
The T cells and B cells are categorized into two types -
Effector cells are the cells that are activated by antigen simulation. Memory cells are the cells that remember the previous infections and work against them if they ever reenter the system.Thus B cells and T cells are both types of lymphocytes.
Therefore the correct option is D.
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HOW AND WHY HAS THE SEA-TURTLE CHANGE?
Answers
All oil wells are drilled with a , a tool which bites into the rock and progressively deepens the hole. 6. The rock particles created by the drill bit are removed from the borehole and carried to the surface by the 7. What does the term spud in mean? 8. into the hole to keep the well walls from caving in. 9. wells determine the size and productive capacity of the oil reservoir. 10. The high temperature on the drill bit by the bit biting into rock was reduced by pumping through the bit.
Answers
The answers to the given questions are as follows:
All oil wells are drilled with the tool called a "drill bit."The rock particles created by the drill bit are removed by the "drilling mud" or "drilling fluid."The term "spud in" refers to the initial drilling of a well. The casing is inserted into the hole to keep the well walls from caving in.To reduce the high temperature on the drill bit caused by the bit biting into the rock, a process called "cooling" is employed.The procedure used to build a well and bore tubes through the Earth's surface is known as oil drilling. The tube is attached to a pump, which forcibly removes the petroleum from underground.
Because oil and natural gas are found far below the earth's surface, drilling is a difficult procedure. To access fossil fuel resources, a hole must be drilled through the crust of the planet. After that, the oil must be safely pumped out of the oil well.
Steps of Oil Drilling:
The first step in oil drilling is to drill a hole through the crust of the earth. It requires a drill string and a long bit. A "drill bit" is the instrument used in oil wells to bite into the rock and gradually deepen the hole.A tiny diameter steel pipe is placed after drilling a hole, and the spaces surrounding it are filled with cement. This helps to keep the steel casing stable.In order to lubricate the spinning bit and clear the path of the shattered rocks, the drillers fill the hole with a mixture of solids, liquids, and chemicals, sometimes referred to as "mud," throughout the drilling operation. As the drill bit goes further, more pipes must be added to the drill string. To prevent the pipe connections from separating in the well, screws must be used.Learn more about Oil Drilling from the given link:
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which statement best contrast food chains and food webs
Answers
Answer:
Food chains show a single path of energy in an ecosystem, and food webs show all the overlapping food chains in that ecosystem. Food webs show the path of energy in an ecosystem, and food chains show the path of nutrients in that ecosystem
Explanation:
14. Which statement is true for ALL of the organisms in the ecosystem
represented in the diagram below?*
Answers
Answer:
the answer is c
Explanation:
makes since ig
The statement "energy in organic molecules is released during cellular respiration" is true for all of the organisms in the ecosystem represented in the diagram below.
What is cellular respiration?Cellular respiration is the process by which organisms mix oxygen with food molecules, transferring the chemical energy in these molecules to life-sustaining processes while discarding carbon dioxide and water as waste products.Glucose is broken down in the presence of oxygen to produce carbon dioxide and water during cellular respiration. The energy-carrying molecule ATP captures the energy generated during the process (adenosine triphosphate).learn more about cellular respiration here:
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How could the aquifer around the Los Angeles are in California be susceptible to an impact by a Tragedy of the Commons?
Answers
Answer:
Due to over-pumping of water.
Explanation:
The aquifer around the Los Angeles are in California could be susceptible to an impact by a Tragedy of the Commons because the people used more water than the aquifer receives. The excess use of water from the aquifer through the well causes depletion of water which results in the shortage of water to fulfill the needs of existing population so it is wise to use water efficiently and used lower or equal water the aquifer receives in order to maintain level of aquifer.
a lubricant containing lipids, cell debris and some natural antibiotics is:_____.
Answers
Answer:
Smegma
Explanation:
A lubricant containing lipids, cell debris and some natural antibiotics is smegma.
Hope this helps!
Draw your own Punnett square using the following data.
he mother has long fur:
(F)
F = long fur
Che father does not have long fur: (ff)
f = short fur
Answers
Answer:
The punnet squares are in the pic above. Either of them could be correct because the mother may have 2 dominant traits (FF) , or one of them could be recessive (Ff).
Any process used to ask and answer testable questions about observations of the natural world” defines which term?
Answers
Answer:
That is the definition of a hypothesis.
Explanation:
If the 5′ → 3′ nucleotide sequence on the nontemplate dna strand is cat, what is the corresponding codon on mrna?.
Answers
If the 5′ → 3′ nucleotide sequence on the non template DNA strand is CAT, the corresponding codon on mRNA will be CAU. DNA first gets converted into RNA and then the complementary codon is read on mRNA.
Both the coding (or sense) and the template (or non-coding, or anti-sense) strands of DNA are complementary and anti-parallel. During transcription, the RNA polymerase "reads" the template strand in the 3' to 5' direction to create a complementary RNA that is in the 5' to 3' direction. Since the template strand of DNA is complementary to both the coding strand of DNA and the RNA, the coding (or sense) strand reveals the meaning of the RNA, except that all Ts in the coding strand are converted to Us in RNA because RNA employs uracil bases rather than thymine bases. Hence, the CAT on DNA template strand first converts into GTA and then changes to CAU. Here A gets replaced by U because of presence of mRNA.
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The Narrowmouth Catshark and the Spiny Dogfish shark are species with overlapping fundamental niches in the South Atlantic. As a result, the Narrowmouth Catshark occupies a realized niche that feeds on benthic fish and crustaceans, while the realized niche of the Spiny Dogfish includes feeding on pelagic school fish. This scenario BEST illustrates which species interaction
Answers
Answer:Despite the immense variety of species, these aquatic creatures generally share a similar body shape. They have elongated bodies with long tails, and their pectoral fins usually stick outward from their bodies rather than downward. While most species measure at about three feet long, they range in size from about eight inches long to over five feet long.With such a wide variety of species to choose from, you can find any number of interesting traits and adaptations. Learn more about some individual catshark species below.
The nursehound is one of the largest catshark species, with maximum lengths exceeding five feet. Their name originates from a fisherman’s tale, which depicts this species caring for its younger relatives. Despite this name, nursehounds do not offer any parental care.
Despite the unappealing name, people actually eat this species as food! They are popular in England, Germany, Italy, and France.
You can find various Cat Shark species in oceans nearly worldwide. The different species live in tropical and temperate oceans. Each species has its own unique range and distribution. Some species live across entire oceans, while others only live in a single small region.
These sharks are carnivores, which means that they eat other animals. Their diet generally depends on two primary factors, their size and their location. Smaller species usually feed on small fish, squid, crabs, and other invertebrates. Larger species can fit larger fish and other prey in their mouths.
Species living in different areas eat different prey, depending on what is abundant near them. Regardless of species, these sharks mostly eat other benthic organisms rather than traveling up the water column for food.
Human interaction varies drastically from species to species. Those with large populations and wide distributions generally do not suffer as heavily from overfishing and bycatch. However, species that live in small regions decline swiftly due to human impacts.
Some of the primary threats to these creatures include overfishing of their populations or their prey, bycatch in nets aimed at other species, pollution of their waters. In addition, climate change impacts temperatures, reducing egg viability, as well as negatively affecting their prey species.
Explanation: it's too long to type
How can fossils tell scientist about the past?
Answers
Answer: Fossils can tell scientists about the past by showing how the skeleton is structured so they can get an idea about what they ate, their limitations, and sometimes even how they acted or mated.
Explanation:
What would Most likely happen if the number of salmon decreased??
A. The Plankton population would rise.
B. The Shrimp population would decrease.
C. The Shrimp population would increase.
D. Salmon would become extinct.
Answers
Answer:The Shrimp population would increase.
Explanation:
Answer:
I would say B, because then they need more food as a whole and shrimps are a salmon's dish
according to cell theory which are made of cells check all that apply
Answers
Answer:
Cells are the basic building blocks of all living things.
Explanation:
I have no idea what the answers are but every living thing is made of one or more cells.
in drought conditions, many plants aren't able to survive because they do not have enough water to photosynthesize. which step in photosynthesis would be blocked by drought conditions?
Answers
In drought conditions, the step of photosynthesis that would be blocked is the light-dependent reactions which take place in the thylakoid membrane of the chloroplast.
Photosynthesis is the process by which green plants and some other organisms utilize sunlight to synthesize foods with the aid of chlorophyll pigments, carbon dioxide, and water. Photosynthesis in plants is carried out by organelles called chloroplasts, which contain chlorophyll pigment. Chloroplasts convert light energy into chemical energy in the form of ATP by using photosystems 1 and 2, which are complex arrangements of pigments and proteins.
The ATP produced is used in the dark reactions of photosynthesis (also known as the Calvin cycle), which occur in the stroma of the chloroplasts. The dark reactions take carbon dioxide and water to make sugars, with oxygen gas as a by-product. The process of photosynthesis can be divided into two parts: light-dependent reactions and light-independent reactions.
Light-dependent reactions: During light-dependent reactions, energy is obtained from sunlight and converted into chemical energy in the form of ATP, which is used in light-independent reactions. This process takes place in the thylakoid membrane of the chloroplasts. It is during this process that water is split into oxygen and hydrogen ions.
Light-independent reactions: During light-independent reactions, chemical energy in the form of ATP is used to convert carbon dioxide to glucose. This process takes place in the stroma of the chloroplasts.
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air passes from the nose into the bronchi true or false?
Answers
Answer:
True
Explanation:
The right lung has 3 sections called lobes and is a little larger than the left lung, which has 2 lobes. The bronchial tubes divide into smaller air passages called bronchi. The functioning of the lungs is discussed in detail.
match the plant structures and functions they perform with the process that they are supporting for the plant
1. The stamen relates to _____ by producing pollen/ sperm
2. The stomata relate to _____ by allowing oxygen to enter the plant
3. The leaf relates to _____ because its cells are numerous in chloroplasts
4. The root relates to _____ by forming the first parts of the plant
5. The leaf relates to _____ because its surfaces are covered in a waxy cuticle
Word bank:
Cellular respiration
Reproduction
Growth
Transpiration
Photosynthesis
Answers
Answer:
Reproduction
Transpiration
Photosynthesis
Growth
Cellular respiration
Explanation:
In the rain forest, the thick foliage allows limited sunlight to filter through to the forest floor. Which wild cat species is best adapted to living in the rain forest?
Answers
Answer
D)Ocelot because they are medium sized cats that live in rain forests and grasslands.Ocelots appear to be better adapted to habitat disturbance and can live in disturbed forests. However, they can be found in a variety of habitats in Belize, from dry scrub to the dense forests.
What are the 7 layers of skin?
Answers
The skin is the largest organ in the human body and is made up of several layers. These layers, from outermost to innermost, are:
Epidermis: This is the outermost layer of the skin and is made up of multiple layers of cells called keratinocytes. These cells produce the protein keratin, which gives the skin its strength and waterproof properties.
Dermis: The dermis is the layer of the skin beneath the epidermis. It contains blood vessels, nerves, and sweat glands. Collagen and elastin fibers provide the skin with elasticity and support.
Subcutaneous tissue: This layer is also known as the hypodermis. It is made up of fat cells, blood vessels, and nerves. The subcutaneous tissue helps to insulate the body and protect it from injury.
Hair follicles: These are small structures that extend from the epidermis into the dermis. Each follicle contains a hair shaft and a sebaceous gland which produces oil that moisturizes the hair and skin.
Nail root: This is where nails originate from, it is an extension of the epidermis and the area that surrounds it.
Sweat glands: These glands are located in the dermis layer of the skin and produce sweat, which helps to cool the body and maintain body temperature.
Sebaceous gland: These glands are located in the dermis layer of the skin and produce oil, which moisturizes the skin and hair.
All these layers work together to protect the body, regulate body temperature, and provide sensation. The skin also plays an important role in the immune system, helping to protect the body against infections and other harmful organisms. It is important to take care of the skin by keeping it clean and moisturized, protecting it from the sun, and avoiding smoking and other harmful habits.
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Plasma membranes are selectively permeable. This means
Answers
Plasma membranes are selectively permeable. This means.
the membrane allows some materials to freely enter or leave the cell#CarryOnLearning\( \mathfrak{WatanabeHaruto}\)
A red blood cell is placed in a 0.9% salt solution. If the cell remains at equilibrium, neither gaining nor losing water,
identify the type of solution the cell has been placed in.
A)
Hypertonic
B)
Isotonic
Hypotonic
D)
Hydrostatic
Answers
Answer:
g
Explanation:
The stories seem as tall as the lake is deep. For hundreds of years, visitors to Scotland's Loch Ness have described seeing a `monster. Some believe it lurks in the depths of the loch, or lake.
But now the legend of "Nessie" may have no place left to hide. A New Zealand scientist is leading an international team to the lake next month. They will take samples of the murky waters and conduct DNA tests to determine what species live there.
University of Otago professor Neil Gemmell says he's no believer in Nessie, but he wants to take people on an adventure and communicate some science along the way. Besides, he says, his kids think it's one of the coolest things he's ever done.
One of the more far-fetched theories is that Nessie is a long-necked plesiosaur. Plesiosaurs were long-necked marine animals that lived during the time of dinosaurs. The theory is that the reptile somehow survived the period when all dinosaurs became extinct. Another theory is that the monster is actually a sturgeon or giant catfish. Many believe the sightings are hoaxes or can be explained by floating logs or strong winds. Gemmell said that when creatures move about in the water, they leave behind tiny fragments of DNA. It comes from their skin, feathers, scales, and urine.
He said his team will take 300 samples of water from different points around the lake and at different depths. They will filter the organic material and extract the DNA, he said, sequencing it by using technology originally created for the human genome project.
He said the DNA results will then be compared against a database of known species. He said they should have answers by the end of the year."I'm going into this thinking it's unlikely there is a monster, but I want to test that hypothesis," Gemmell said. "What we'll get is a really nice survey of the biodiversity of Loch Ness."
He said the real discoveries may come in determining things like the prevalence of invasive species.
"I hope he and his cohorts find something, although I think they'll be battling," Matheson said. "Still, it's a good way to get a trip to Scotland," Gemmell said that even if they don't find any monster DNA, it won't deter some Nessie believers. He said they've already been offering him theories, like how Nessie might be on vacation after swimming to the sea via hidden underwater caves. Another is that the creature might be extraterrestrial and not leave behind any DNA.
"In our lives, we want there still to be mysteries, some of which we will ultimately solve," Gemmell said. "That's part of the spirit of discovery. And sometimes, what you find may not be what you were expecting."
Who - New Zealand scientist
What - taking water samples
When - next month
Where - Scotland
Why - determined if the loch ness monster is real
How - testing DNA samples
Use 5 Ws and H to write a summary of the article above, including a main idea (first sentence) and at least 3 supporting details.
Answers
Neil Gemmell, a lecturer at the University of Otago, said he doesn't believe in Nessie, but he still desires to take tourists on an experience and interact with them.
Describe an adventure?A book detailing his numerous daring expeditions. the experience of risks the spirit of exploration. : a memorable or interesting experience. It could also be a daring, typically dangerous activity with a hazard of failure. Adventures might include physically risky activities like exploring, skydiving, mountain biking, river rafting, or engaging in extreme sports.
Describe a book?A collection of printed, blank, or written sheets bundled within a front and rear cover. a large printed or written literary work.: an address book Pages are the pieces of paper that make up a book. The pages contain
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which would most likely result in an increase in generic variation in a population?
a) an increase in predators and a decrease in food
b) an increase in predators and an increase in food
c) a decrease in predators and an increase in food
d) a decrease in predators and a decrease in food
Answers
Answer:
the smaller population would grow
Explanation:
Which of the following is a characteristic of amphibians but not reptiles? a. amniotic egg b. backbone c. larval stage d. rough, dry skin
Answers
Answer:
C
Explanation:
The amphibian larva represents a morphologically distinct stage between the embryo and adult. The larva is a free-living embryo. ... Not long after emerging from their egg capsules, larval salamanders, which have four fully developed limbs, start to feed on small aquatic invertebrates.