Which statement about the cell membrane is true?

A) It contains cellulose and sugars that are involved in communication.

B) It is present in animal cells only.

C) It is rigid and elastic for supporting the cell's shape.

D) It prevents harmful substances from entering a cell.

Answers

Answer 1

Answer:

Its D, The cell membrane(also known a the plasma membrane) has a job in which it has to allow passage in and out of the cell. Therefore it can prevent harmful substances from entering the cell. Think of it as security, either allowing you access or denying you depending on if you're a threat

Answer 2

Answer:

D) it prevents harmful substances from entering a cell

Explanation:

The entire purpose of the cells membrane is to contain its organelles, the structures within it and prevent them from getting harmed by outside material.


Related Questions

Which of the following is the primary method of controlling citrus canker?


quarantine and destruction of infected plants

treatment with fungicides

genetic modification of plant stock

treatment with herbicides

Answers

Answer:

genetic modification of plant stock

any 2 characteristics of columnar epithelium​

Answers

Polarity- Epithelium is arranged so there is one free surface (apical surface) and one attached surface (basal surface)

Cellular nature– Cells in epithelium fit closely together side by side and sometimes atop each other to form sheets of cells.

Complete these three sentences using the same pair of words each time . Ice is made up of_______ ______ Water is made up of ______ _____ Water vapour is made up of _____ ___

Answers

Answer:

Hydrogen & Oxygen

Explanation:

How can evidence from an experiment be explained in relationship to the hypothesis?
• as a prediction
• as a question
• as an inference
• as a conclusion

Answers

Answer:

As a conclusion

Explanation:

A hypothesis is a tentative statement about the relationship between two or more variables. It is a specific, testable prediction about what you expect to happen in a study.  A hypothesis is a prediction based on the theory being tested. The evidence can support the Hypothesis or invalidate the Hypothesis.

Answer:

A conclusion

Explanation:

It sums up everything that you did

Which of the following statements about active transport is true?

Molecules move down the concentration gradient.

ATP is not required to move molecules through the membrane.

ATP is formed as molecules pass through protein channels.

It results in a higher concentration of molecules on one side of the membrane.

Answers

Answer:

It results in a higher concentration of molecules on one side of the membrane.

Explanation:

Active transport is the transport of molecules up the concentration gradient. This means that molecules are going from low density to high density. This is the opposite of natural diffusion. So, it requires ATP to move the molecules this way. Diffusion normally occurs to maintain homeostasis and an equal amount of concentration on both sides of a membrane. But, with active transport, since molecules are moving up the gradient, the opposite happens and the concentrations are unequal.

(h) Which one of the following favours the fastest transpiration rate ? (i) A cool, humid, windy day (ii) A hot, humid, windy day (iii) A hot, humid, still day (iv) A hot, dry, windy day​

Answers

Answer:

Hot temperature, dry and windy environment causes fastest transpiration rate.

option IV

Which of the six kingdoms are ONLY multi-cellular? *

Answers

Answer:Plantae and Animalia

Explanation:

Plantae and animalia

what is tissue A called? ​

Answers

Answer:

Tissue is a group of cells that have similar structure and that function together as a unit. A nonliving material, called the intercellular matrix, fills the spaces between the cells. ... There are four main tissue types in the body: epithelial, connective, muscle, and nervous

How does Earth's internal structure contribute to its magnetic field?
A. The inner core is a permanent magnet made of iron, and the liquid
iron in the outer core aligns with that magnet's magnetic field.
B. Convection currents in the core generate a magnetic field, which is
strengthened by convection currents in the mantle.
C. The crust becomes magnetic because of radiation from the sun,
and the resulting magnetic field makes all of Earth's layers
magnetic
O D. Convection currents in liquid iron in the outer core generate an
electric current, which produces a magnetic field.

Answers

i think answer D( convection currents in liquid iron in the outer core generate an electric current , which produces a magnetic field)

D
I think its the best answer
Hope its help

No.3 plzz ...?
Any one ​

Answers

2^n=32

n=5

It doesn't really match up with the options so not sure, my best guess would be either choosing 16 or 4. 16 in case the person calculated as 16 times 2 = 32 and 4 bc its the closest.

perfect 2 minute speech on deforstation

Answers

Answer:

A warm welcome to all present here. Today I am going to give a speech on deforestation. Deforestation is the process of cutting down the forest, without replanting them again. The causes for deforestation are to obtain wood and fuel or to use the land for farming, mining or construction. From the time of civilization till now, forest wood is very essential for humans in our day to day life.

Explanation:

U can add more if u like it!

which statement correctly pairs the organelle with its function

Answers

Answer:

smooth endoplasmic, metabolism, lipids

Explanation:

these are the answers hope this helps you out.

When many nucleotides link together, they form a biomolecule responsible for storing genetic information called a
Group of answer choices

protein.

nucleic acid.

retinal.

carbohydrate.

Answers

Nucleic acid, just know nucleic acid is made up of nucleotides

When many nucleotides link together, they form a biomolecule responsible for storing genetic information called nucleic acids. Thus, the correct option is B.

What are Nucleotides?

Nucleotides may be defined as the basic unit of the polynucleotide chain of nucleic acids such as DNA or RNA. Each nucleotide is composed of three components. They are as follows:

A nitrogenous base.A pentose sugar (ribose in the case of RNA, and deoxyribose in the case of DNA).A phosphate group.

Nucleotides are the monomers of nucleic acids. Each nucleotide is joined together by covalent bonds known as phosphodiester linkage. This linkage is present between the phosphate group of one nucleotide and the third carbon atom of the pentose sugar of next nucleotide.

Therefore, nucleic acids are formed when many nucleotides link together which are responsible for storing the genetic information.

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Frequently, a group of related species will each have a unique courtship ritual that must be performed correctly for both partners to be willing to mate. Such a ritual constitutes a ________ ________ reproductive barrier. Group of answer choices

Answers

Complete question:

Frequently, a group of related species will each have a unique courtship ritual that must be performed correctly for both partners to be willing to mate. Such a ritual constitutes a ________ ________ reproductive barrier.

Group of answer choices

A) behavioral . . . prezygotic

B) mechanical . . . postzygotic

C) temporal . . . prezygotic

D) gametic . . . postzygotic

Answer:

A) behavioral . . . prezygotic

Explanation:

The biological concept of species states that individuals of a species can not mate and reproduce with individuals of another species. But if they get to reproduce, the progeny will not be viable or fertile. There will not be any reproductive success.

There are different reproductive isolation mechanisms, which are barriers that inhibit or interrupt the genetic flow between different species.

Reproductive barriers are isolation mechanisms that prevent mating between two or more species. The prezygotic mechanism avoids fertilization between individuals of different species, while the postzygotic mechanism impedes the zygote to develop and reach the adult stage.

There are different types of reproductive barriers.

Pre-copulatory o pre-ziygotic:

Ecological or by habitat isolation; Seasonal or temporal; Sexual o ethologic; Mechanic; Gametes incompatibility.  

Postzygotic mechanisms or barriers include

Hybrid inviability,   Hybrid sterility, Hybrid reduced viability or fertility, Cytoplasmic interactions.

Behavioral isolation is also known as ethological isolation or sexual isolation. This is a prezygotic barrier that refers to the fact that even when many species occupy the same area, they are not sexually attracted to each other, and might be rejected because of behavioral factors, not getting to mate. This mechanism includes courtship patterns or mating rituals and specific chemical signals that allow recognition between individuals of the same species.

An ecosystem experiences a loss of denitrifying prokaryotes. Will this loss affect the health of the ecosystem?

Answers

yes it will, it will ruin the food chain

Why do oxygen levels drop sharply during eutrophication?

Answers

Explanation:

during eutrophication, there is a presence of excess algae in the water body. this causes an excess overconsumption of available organic materials by algae, causing the oxygen levels to reduce rapidly.

When the algae population grows rapidly, it may hinder sunlight from reaching other lifeforms and cause dissolved oxygen levels to fall.

What is eutrophication?

Eutrophication is the substantial increase in phosphorus, nitrogen, and other organic material in an ageing aquatic environment such as a lake.

As the amount of organic material that can be subdivided into nutrients increases, so does the efficiency or fertility of such an ecosystem.

When the algae population grows rapidly, it may prevent sunshine from reaching other organisms and cause dissolved oxygen levels to fall.

The primary environmental impacts of eutrophication are an increase in suspended particles caused by extensive macroalgal blooms, a decrease in water clarity, and an increase in precipitation rate, which has resulted in the destruction of benthic habitat due to shading of submerged vegetation.

Thus, this way, oxygen levels drop sharply during eutrophication.

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If the results of an experiment are considered valid they will? A. Give the same nontestable results B. Give The same outcome when repeated C. Give different outcomes in different parts of the world D. give different results from repeated by different scientist

Answers

Answer:B

Explanation:

If it's valid, then it has substantial evidence to back up the results, which will  be the same over and over again.

Which would make for a weak claim?
• a blog cited as the source
• a large sample size
• clear variables and controls
• multiple trials

Answers

Answer:

A

Explanation:

Blogs can have a lot of misinformation

Isabel's first car had a manual stick shift. After many years of driving an automatic car, she needs to use her sister's car, which also has a stick
shift. Isabel takes a few minutes to get used to shifting gears. Which memory system Is she using to recall this information?
• A. episodic memory
O B. procedural memory
• C.
semantic memory
)D.
sensory memory

Answers

Answer:

Procedural memory

Explanation:

Isabel has to recall the information about using a manual stick shift. For this reason, she is using long-term, explicit, declarative and episodic memory system.

Human memory system can be broadly classified as: sensory memory, short-term memory and long-term memory.

Long-term memory is used to recall information. If the information are about facts, events and experiences then explicit, declarative and episodic memory helps to recall all information. This will help Isabel to recall all information about driving a car with a manual stick shift and she will be able to drive her sister's car.

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Which molecules in your body do
not contain carbon atoms?
Genes, which are made of DNA
Proteins
Sugars
Water

Answers

I'm pretty sure its water

ASAP
The cell cycle occurs in which order?
A. G1, S, G2, Cytokinesis, Mitosis
B. G1, S, G2, Mitosis, Cytokinesis
C. S, G1, Mitosis, G2, Cytokinesis
D. S, G1, G2, Mitosis, Cytokinesis

Answers

Answer:

B. G1, S, G2, Mitosis, Cytokinesis

Explanation:

G1 is the first stage of the cell cycle, and it is essential for cell growth.

Next, the S (Synthesis) phase occurs. This phase involves DNA synthesis to prepare the cell for division.

G2 is the next phase, and it involves preparing and growing the cell for mitosis.

Mitosis is the next stage, where the cell divides into 2.

Lastly, Cytokinesis occurs after mitosis, and it creates the two daughter cells.

So, the correct answer is B. G1, S, G2, Mitosis, Cytokinesis

ASAP
When you become too cold, your hypothalamus will signal what parts of your body to raise the temperature?
A. Muscles and kidneys
B. Skin and pancreas
C. Muscles and skin
D. Kidneys and lungs

Answers

Answer:

c

Explanation:

Muscles and kidneys or muscles and skin

Which method gives the actual age of a fossil in years?

Answers

Answer:

Radiometric dating methods

Explanation:

Researchers use a clock to estimate the date a rock or fossil was produced in order to ascertain its age. Radiometric dating methods, which are based on the natural radioactive decay of specific elements like potassium and carbon, are widely used by geologists to date ancient events.

OAmalOHopeO

What do you mean by hypometrophia?​

Answers

Answer:

Hypermetropia is also referred to as hyperopia or long-sightedness or far-sightedness. Hypermetropia is the condition of the eyes where the image of a nearby object is formed behind the retina. Here, the light is focused behind the retina instead of focusing on the retina

What energy using-process helps to cool the body

Answers

Answer:

Convection

Explanation:

convection is the process of losing heat through the movement of air or water molecules

Can bacteria break down plastics?
Give reason

Answers

Answer:

Yes, bacteria can break down plastics because they break down the molecules of the plastics into their original building blocks and by secreting an enzyme which “eats” the chemical bonds in the chain, the molecules are broken down into their smaller components.

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Question
Use the text to identify the sentences with evidence that matches the claim.

Claim 1 --> Tropical rainforests contain more biodiversity than all other biomes.

1) Biodiversity refers to the total number of different species of all kinds living in an area.

2) Tropical rainforests have many of the climate characteristics that organisms of different species need to grow, such as warm temperatures, plenty of rain, and many food sources.

3) There are large amounts of daily sunlight, which provides a great deal of energy to a variety of rainforest organisms.

4) Surprisingly, rain forest soil is very poor.

5) Due to the large amounts of rainfall, nutrients are leached out of the soil quickly.

6) Warm temperatures cause dead organisms to decay quickly, and the nutrients are then used by many different plants.


1, 2, 5
1, 2, 5

1, 3, 4
1, 3, 4

2, 3, 6
2, 3, 6

1, 4, 5

Answers

Answer:

44

Explanation:

44-7=55

The negative effect humans have on the stability of the environment is mostly directly linked to an increase in

Answers

Explanation:

Machinery as an energy unit for agricultural work produces a negative impact on the environment on soils, waters and the atmosphere. ... In the exploitation process it exerts impacts such as: soil degradation, water pollution and pollution of the atmosphere.

Which of the following best defines gene flow?

the sum of all genetic traits in a population's individuals at a given time any movement of genes from one population to another any movement of organisms from one environment to another the random change in the frequency of an allele in a population​

Answers

[tex]\large{\underbrace{\underline{\fcolorbox{pink}{aqua}{\bf{ANSWER♥︎}}}}}[/tex]

Gene flow — also called migration — is any movement of individuals, and/or the genetic material they carry, from one population to another. Gene flow includes lots of different kinds of events, such as pollen being blown to a new destination or people moving to new cities or countries.

Answer:   any movement of genes from one population to another.

Explanation: :)

ASAP Determine whether the statement is true or false and why. “We have discovered a series of humanoid fossils that are similar to humans, but not human. Each of these humanoid species dates to a different period in time becoming more human-like the closer to the present they are, showing a clear evolution into humans.”
A. False, it should read “We have discovered no series of humanoid fossils that are similar to humans, showing a clear lack of any transitional fossils as evidence of human evolution”
B. True
C. False, it should read “We have discovered a series of humanoid fossils that are similar to humans, but not human. Each of these humanoid species dates to a different period in time becoming less human-like the closer to the present they are, showing a clear evolution away from humans.”
D. False, it should read “We have discovered a series of humanoid fossils that are similar to humans, but not human. Each of these humanoid species dates to the same period in time, showing that many human-like species existed at once, but all went extinct.”

Answers

The statement is true.

Human evolution is a scientific term that refers to the process of biological evolution of the human species from its ancestors to the present.

The current knowledge of human evolution is the result of the convergence of various sciences such as:

Genetics.Physical anthropology.Paleontology.Geochronology.Archeology.Linguistics.

The results of various studies relate the current human species as a result of multiple evolutionary processes of hominimus species, ardipithecus, australopithecus, and homo that through time improved different aspects until reaching the human species that exists today.

According to the above, what is described in the fragment presented is true because it presents a correct version of what happened in human evolution. Meanwhile, options A, C and D are incorrect because they do not present correct information regarding human evolution.

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The fields of antebellum (pre-Civil War) political history and womens history use separate sources and focus on separate issues. Political historians, examining sources such as voting records, newspapers, and politicians writings, focus on the emergence in the 1840s of a new "American political nation," and since women were neither voters nor politicians, they receive little discussion. Womens historians, meanwhile, have shown little interest in the subject of party politics, instead drawing on personal papers, legal records such as wills, and records of female associations to illuminate womens domestic lives, their moral reform activities, and the emergence of the womans rights movement.However, most historians have underestimated the extent and significance of womens political allegiance in the antebellum period. For example, in the presidential election campaigns of the 1840s, the Virginia Whig party strove to win the allegiance of Virginias women by inviting them to rallies and speeches. According to Whig propaganda, women who turned out at the partys rallies gathered information that enabled them to mold party-loyal families, reminded men of moral values that transcended party loyalty, and conferred moral standing on the party. Virginia Democrats, in response, began to make similar appeals to women as well. By the mid-1850s the inclusion of women in the rituals of party politics had become commonplace and the ideology that justified such inclusion had been assimilated by the Democrats.The primary purpose of the passage as a whole is toA. examine the tactics of antebellum political parties with regard to womenB. trace the effect of politics on the emergence of the womans rights movementC. point out a deficiency in the study of a particular historical periodD. discuss the ideologies of opposing antebellum political partiesE. contrast the methodologies in two differing fields of historical inquiry 15. In a school, the ratio of boys and girls is 4:5, when 100 girls leave the school, the ratio becomes 6:7. How many boys are there in the school A friend is calling his sister from his parents house to talk to her about what means of transportation various people are using to come visit their parents to celebrate their 50th anniversary. 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