The fluid mosaic model shown above describes the structure and function of
A.
nuclei.
B.
cell membranes.
C.
chloroplasts.
D.
chromosomes.
Answers
The corrrect option is B (Cell membrane).
Explanation:
Fluid Mosaic Model was proposed by Fluid Mosaic Singer and GL Nicolson in 1972, to describe the structure of cell membrane.
Statement:
"According to this model cell membrane is like a sea of lipids in which protein molecules are floating".
Explanation:
Fluid mosaic model show that cell membrane is composed of:
1. proteins:
Two types of proteins are present in cell membrane.
a. Intrinsic protein:
Also known as integral proteins. These proteins are nestled into phospholipid and embedded in the cell membrane.
b. Extrinsic protein:
These proteins are also known as peripheral proteins. These are present on the surface of cell membrane.
2. Phospholipid:
Each phospholipid is composed of head and two tails. The head is phosphate group which is hydrophilic while tail is composed of fatty acid which is hydrophobic.
3. Carbohydrate molecules:
It is the third major composition of plasma membrane. Two types of conjugating molecules are also present in plasma membrane.
Example:
Glycolipids and glycoproteins.
4. Cholesterol:
Cholesterol is a type of steroid which help in regulating molecule entering and exiting cell.
Answer:
The correct answer would be B. cell membranes.
Fluid mosaic model is one of the models which explains the structure of functional cell membrane.
It explains cell membrane as the mosaic structure made up of components like phospholipid, proteins, cholesterol, and carbohydrates which provide the cell membrane a fluid nature.
Phospholipids are the prime component of the lipid bilayer. Proteins are embedded in the lipid bilayer structure and serve different functions like cell signaling.
Related Questions
Water diffusion through a ____________ cell membrane is made easier by membrane proteins called aquaporins.
Answers
Water diffusion through a hydrophobic cell membrane is made easier by membrane proteins called aquaporins. The correct answer is hydrophobic.
Plasma - membrane separates the inner and outer environment of the cell. It provides protection to the cell. It has hydrophobic region tails.
Some cell's plasma - membrane contain the water channels known s aquaporins by which the water molecules easily cross the membrane than the phospholipid membrane.
Aquaporins functions in transporting the water molecules in and out of the cell without disturbing the passage of the other ions.
So, the correct answer answer is hydrophobic.
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Final answer:
Water diffusion through cell membranes is facilitated by proteins called aquaporins that increase the efficiency of water transport via osmosis. These proteins are essential for maintaining cellular water balance and have been linked to various genetic diseases. Aquaporins are an example of facilitated diffusion and can also help transport other small molecules.
Explanation:
Water diffusion through a semi-permeable cell membrane is made easier by membrane proteins called aquaporins. Aquaporins are specialized channel proteins that facilitate the rapid transport of water across the cell membrane, contributing to the process known as osmosis. While water can passively diffuse through a membrane, aquaporins increase the rate at which water moves in response to a concentration gradient. This is an example of facilitated diffusion, and aquaporins can also help the transport of other small molecules and ions in addition to water.
Aquaporins are essential for maintaining the water balance within cells and are so significant that their discovery led to a Nobel Prize in Chemistry for Peter Agre. Mutations in aquaporin genes have been linked to various genetic diseases, emphasizing their importance in biology. These proteins are also allosterically regulated allowing cells to adjust water permeability according to their specific needs
A diet high in ________ is linked to high rates of colon and prostate cancer. fat and meat nitrosamines
Answers
What is the muscular organ that holds the developing embryo?
Answers
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The plankton in the ocean ingested mercury that was in the water. a small fish ate the plankton. a larger fish ate the smaller fish that had eaten the plankton. marcus ate the large fish that had eaten the smaller fish. this reflects __________.
Answers
The food chain describes relationships among the organisms by showing how the organisms are related to each other by the food they eat. The food chain contains levels and each of them presents a different trophic level (position of the organism in that chain). There is reliable energy transfer through each stage of the chain. Not all the energy at one stage is absorbed by the organism at the next stage but, the amount of energy from one stage to another decreases.
How is the function of dialysis tubing similar to the small intestine?
Answers
The function of dialysis tubing is similar to the small intestine due to their shared role in the absorption of materials. Just like the small intestine absorbs nutrients from food into the bloodstream, dialysis tubing enables the transfer of certain substances. Both heavily rely on the process of osmosis for their functioning.
Explanation:The function of dialysis tubing is similar to the small intestine in the aspect of absorption of materials. For instance, the small intestine, with its villi and microvilli, allows for the nutrients to be absorbed from the digested food into the bloodstream. It increases the surface area for increased absorption efficiency, which is the same principle the dialysis tubing operates on.
The dialysis tubing is semi-permeable, allowing for certain substances to pass through, while keeping larger substances within. Similarly, the small intestine absorbs nutrients from the chyme while leaving larger, indigestible food residue to be passed into the large intestine.
Moreover, both the small intestine and dialysis tubing depend heavily on the process of osmosis for their functioning. The small intestine absorbs most of its water via osmosis, just as the dialysis tubing relies on osmosis to filter out waste products from the blood during dialysis treatment.
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The process by which organisms keep internal conditions relatively constant is called
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What role did mycorrhizae play in the transition of plants to land?
Answers
A population of bacteria is treated with hand sanitizer. Because of genetic variation in the population, what is the possible outcome?
A. All of the bacteria are already resistant
B. They will get better at obtaining a food source
C. The population will grow quickly
D. Some of the bacteria may be resistant and survive.
Answers
Answer:
D. Some of the bacteria may be resistant and survive.
When a population of bacteria is exposed to hand sanitizer, due to genetic variation among the bacteria, a possible outcome is that some of the bacteria may be resistant and survive. Hence, the correct option is D.
This scenario highlights the principle of natural selection, where genetic variations that offer a survival advantage in a specific environment are more likely to be passed on to future generations. Given that resistance to sanitizers or antibiotics in bacteria is caused by specific genes already present in the gene pool of the bacteria, applying a sanitizer selectively kills those without resistance, thereby allowing only resistant individuals to survive and reproduce. This does not mean the bacteria become overall stronger or better at obtaining food sources, nor does it imply that the entire population will grow quickly. Instead, the population will evolve over time to have a higher proportion of individuals with the resistant gene, as it is the key trait that enables survival and reproduction in the presence of hand sanitizer.
Homeostasis is the process of maintaining a stable internal environment in the body. what is the term that defines the targeted value to be maintained?
Answers
The operation of nuclear power plants in the United States is closely monitored and regulated. Please select the best answer from the choices provided T F
Answers
The operation of nuclear power plants in the United States is closely monitored and regulated. The NRC or Nuclear regulatory commission is the body that is tasked to monitor and regulate the construction and operation of nuclear power plants. Nuclear power plants use the heat generated from nuclear fission in a contained environment to convert water to steam, which powers generate to produce electricity.
Ture
Explanation:
I just took the test
in figure 33-6 what structure is labeled a? what is the role of the delicate network?
Answers
Alveoli are the important part of the respiratory system. Its function is to exchange carbon dioxide and oxygen molecules from and into the bloodstream. They are the end point of the respiratory system and it starts when we inhale air into the nose or mouth.
Rich air which is oxygen travels down the trachea and to the smaller passage which is called bronchioles and passes through the alveolar duct then finally to the alveolus.
The diagram shows the respiratory structure of humans and their structures. Label A in the diagram is alveoli surrounded by B. bronchioles, C. diaphragm, and D. bronchi,
What is the respiratory system?A respiratory system is an organ system that enables the inhalation and exhalation of the gases. Many parts like bronchi, bronchioles, ribs, diaphragm, alveoli and sacs make the respiratory system.
Alveoli are the essential part of the respiratory system that is the region of the exchange of carbon dioxide and oxygen gases. The network of the capillaries around it allows the exchange of gases from the bloodstream.
Therefore, the label A is the alveoli of the respiratory system.
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The daily value for protein is ____ grams per day.
Answers
A hummingbird needs 10 grams of sugar and 8 grams of protein each day. one honeysuckle flower provides 20 mg of sugar and 10 mg of protein. one nasturtium flower provides 10 mg of sugar and 10 mg of protein. it takes 5 seconds to feed from a nasturtium and 20 seconds per honeysuckle. how many minutes does it take to get exactly the food it needs?
Answers
Since one nasturtium flower provides 10 mg of sugar and 10 mg of protein, the hummingbird needs 1000 nasturtium flowers each day for its nutritional needs (10,000/10 = 1000).
Since one honeysuckle flower provides 20 mg of sugar and 10 mg of protein, the hummingbird needs 500 honeysuckle flowers each day for its nutritional needs.
If the hummingbird feeds only on nasturtium flowers, then the bird will need 5,000 seconds to get exactly the food it needs. This is calculated based on the information that it takes 5 seconds to feed on a nasturtium: 1000 flowers daily * 5 seconds = 5000 sec = 83,3 min.
If the hummingbird feeds only on honeysuckle flowers, then the bird will need: 500 flowers * 20 seconds = 10,000 sec = 166,6 min.
A hummingbird needs 10 grams of sugar and 8 grams of protein each day. One honeysuckle flower provides 20 mg of sugar and 10 mg of protein. One nasturtium flower provides 10 mg of sugar and 10 mg of protein. It takes 5 seconds to feed from a nasturtium and 20 seconds per honeysuckle. She need 83.3 minutes and 166.6 minutes from nasturtium flower and honeysuckle flower respectively.
Further Explanation:
The hummingbirds require 10g of sugar and 8g of protein each day. Honeysuckle gives 10mg of protein and 20 mg of sugar. Nasturtium gives 10mg of protein and 10 mg of sugar. For calculation, unit of each measurement should be same. So, the hummingbird requires total 10,000mg of sugar and 8000 mg of protein.
First case, if humming bird is taken sugar and protein from honeysuckle. The bird takes 20 second to eat each honeysuckle. The hummingbird requires 500 honeysuckle flowers each day to fulfill its nutritional needs. If the hummingbird depends only on honeysuckle flowers, then the bird will need: 500 flowers * 20 seconds = 10,000 sec = 166.6 min.
The hummingbird needs 1000 nasturtium flowers each day for its nutritional needs (10,000/10 = 1000). If the hummingbird depends only on nasturtium flowers, then the bird will require 5,000 seconds to get exactly the food it needs. This calculation is based on the information that it takes 5 seconds to feed on a nasturtium: 1000 flowers daily * 5 seconds = 5000 sec = 83.3 min.
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Grade: High School
Subject: Biology
Chapter: Animal physiology
Keywords:
Humming bird, sugar, protein, measurement, honeysuckle, depend, require, nasturtium, need, bird, information, flower, nutritional need, eat.
Which kingdom includes the organism that causes lyme disease monera protista?
Answers
The kingdom that includes the organism that causes Lyme disease would be monera.
What causes Lyme disease?Lyme disease is caused by bacteria in the Borrelia genus. The genus includes both burgdorferi and mayonii species.
Bacteria generally belong to the kingdom of organisms known as Monera. The kingdom is made up of unicellular organisms that are prokaryotic in nature. The cells of organisms in this kingdom lack nucleus as well as membrane-bound organelles.
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Why do microbiologists need to isolate bacterial colonies from a specimen? quzilet?
Answers
Specimens taken from a patient sample usually contain a mixture of different bacteria. But sample with only one type of bacteria, are necessary to study a bacterial species accurately. Therefore, it is necessary to isolate all of the possible disease causing organisms in order to study the sample by itself. Once isolation of individual colonies is done, then these colonies can be used for identification tests. A sample of the specimen is move very fast onto an agar plate in order to physically separate the bacterial colonies.
How is energy from sunlight used to make sugar molecules?
Answers
Light, H2O, and CO2 are converted into energy and sugar in leaf chloroplasts . Water converts sunlight into plant cell energy-storing molecules. These molecules generate glucose from CO2.
What is photosynthesis?In the process known as photosynthesis, plants convert light, water, and carbon dioxide from the air into oxygen and sugar, which can then be used as a source of energy.
The process of photosynthesis can be broken down into two separate steps. During the light processes, the energy from sunlight is used as a driving force, which results in the synthesis of ATP and NADPH, as well as the creation of O2 from H2O. The light reactions produce ATP and NADPH, which are then used in the dark reactions to power glucose production. The dark reactions get their name from the fact that they do not require sunlight.
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The presence of bright red blood in the stool is known as _____.
a. steatorrhea
b. melena
c. hematemesis
d. hematochezia
Answers
The answer is letter d. Hematochezia. Most rectal bleeding comes from the colon, rectum, or anus and can be connected with diarrhea. Hematochezia is the passage of fresh blood through the anus, usually in or with stools. Hematochezia is also known in medical term as rectal bleeding often associated with a stool and blood clots.
If analogous structures are often examples of convergent evolution,what types of structures would likely be examples of divergent evolution
Answers
Final answer:
Structures that would likely be examples of divergent evolution are homologous structures, which have a common evolutionary origin but may function differently in various related species.
Explanation:
If analogous structures are often examples of convergent evolution, the types of structures that would likely be examples of divergent evolution are homologous structures. While analogous structures are the result of convergent evolution, where different species develop similar traits independently due to similar environmental pressures, homologous structures have a common evolutionary origin but may have different functions in their present forms.
For instance, the forelimbs of humans, whales, and bats are considered homologous structures. They all share a common ancestral limb but have diverged over time to perform different functions aligned with the needs of the respective species—hands for manipulation in humans, flippers for swimming in whales, and wings for flying in bats. This divergence in structure and function among closely related species exemplifies divergent evolution.
Some people think that putting plant roots underwater will allow the plant to absorb all of the water it needs. if you do this to most plants, however, it will kill them. why
Answers
describe at least two ways that carbon can get from land plant to the atmosphere ?
Answers
Carbon can transition from land plants to the atmosphere through processes like respiration and decomposition. Decomposers break down dead organic material, releasing carbon to the soil and then to the atmosphere when they respire. Additionally, burning fossil fuels releases stored carbon as carbon dioxide into the atmosphere.
Explanation:Carbon can transition from land plants to the atmosphere in multiple ways. The first route is through the process of respiration. During this process, both plants and animals exhale carbon dioxide (CO2), which is returned to the atmosphere. The CO2 is produced as a byproduct of breaking down glucose for energy. Secondly, when plants and animals die, decomposers like fungi and bacteria decompose the organic material, returning carbon to the soil. This carbon can then be released into the atmosphere as carbon dioxide when these decomposers respire.
The burning of fossil fuels is another method which releases carbon into the air. Fossil fuels, like coal and oil, contain carbon that has been stored in the ground for millions of years. When these fuels are burned for energy, the stored carbon is released as carbon dioxide into the atmosphere.
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Which makes photovoltaic systems especially useful?
Answers
Answer:
They generate electricity.
Explanation:
all help is appreciated <3
4) Thanks to the development of transgenic plants, much of the food we eat has been altered so that it tastes better, looks better, and lasts longer. This change in agricultural production has lead to new careers in
A) embryology.
B) forensics.
C) genetics.
D) geology.
5) Advancements in the area of agriculture has started to depend on technology sources for better yield and technology advancements have helped in the areas of irrigation, and drainage. Even the packing, processing, and marketing of agricultural products are also the activities which are influenced by science.
The progress of agriculture technology and the improvements of farming have come from many fields of knowledge. Identify from where some of the contributions to agriculture where received.
A) science
B) machinery
C) biotechnology
D) biotechnology, machinery, and science
6) Advancements in nuclear science have led to new technology which have been beneficial to society. Many of the advances are used in medicine. Which is not a medical use of nuclear energy?
A) nuclear fusion
B) radioimmunotherapy
C) magnetic resonance imaging (MRI)
D) positron emission tomography (PET)
Answers
D) biotechnology, machinery, and science
D) positron emission tomography (PET)
When species interact, as fungi and algae do in lichen, so that the interaction of the two species increases the fitness of both species, this is called __________?
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What could potentially happen if an intramuscular vaccine is administered too high?
Answers
The ______________ in the brain subconsciously provides timing and patterns of smooth movement of skeletal muscle and aids in maintaining posture and balance.
Answers
Trevor examines some water from the open ocean and finds that it contains several single-celled and multi-celled organisms. What term should Trevor use to describe the organisms based on their method of locomotion?
Answers
An organism with flagella could be further classified on the number of flagella such as: atrichous(no flagella), monotrichous(1 flagella), amphitrichous(flagella on both side), lophotrichous(many flagella on one end), peritrichous(flagella all around the membrane)
Answer:
Pelagos
Explanation:
It is the correct answer on pluto
Which of the following reasons best explains why a scientist would want to study rock formations and living organisms in previously unexplored water habitats?
A.
to discover new aspects of the natural world
B.
to explain recently observed phenomena
C.
to test the predictions of current theories
D.
to test the conclusions of prior investigations
Answers
The correct answer is option (A) to discover new aspects of the natural world.
The study of rock formations and living organisms in previously unexplored water habitats helps a scientist to discover the newer aspects of the natural world. The unexplored water habitats are the best source to understand the newer aspects of the aquatic bodies like the new species of plants or animals, factors affecting the aquatic life and the different types interactions in the habitats. The study of rock also helps in the study of plants and animals, which were once a part of the habitat, now in the form of fossils.
Thus, the study of rock formations cannot explain the recently observed phenomena as they help in the study of fossils. The study of living organisms in previously unexplored water habitats cannot be applied to test the conclusions of prior investigations and test the predictions of current theories as they remained unexplored.
Describe how mitochondria and atp are related to cellular respiration.
Answers
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Molecules tend to move from an area of high concentration to an area of low concentration in a process known as
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You catch ,tag ,and release 35 fish back into a pond . Then, you catch 70 more fish , 12 of which have tags on them . What is the best estimate of the number of fish in the proof?
Answers
Final answer:
Using the mark and recapture formula, the best estimate for the total number of fish in the pond would be approximately 204 fish.
Explanation:
The question asked is an example of a mark and recapture problem commonly used in biology to estimate population sizes, but it relies on mathematical principles. The formula used for the estimation is:
Total population (N) = (Number of first catch × Number of second catch) ÷ Number of marked recaptures in second catch
In this case, you initially catch and tag 35 fish (first catch), then later catch 70 more fish (second catch), 12 of which are tagged from the first catch. Applying the mark and recapture formula:
Total population (N) = (35 × 70) ÷ 12
Doing the math: N = 2450 ÷ 12 → N ≈ 204.
Therefore, the best estimate for the total number of fish in the pond would be approximately 204 fish.