Which is a factor that determines whether a molecule can cross a cell membrane?

Answers

Answer 1

Answer:

 if a molecule is too large it cannot pass. also it depends on the concentration of a specific substance inside the cell. similarly, if a molecule is polar it cannot penetrate the phospholipid bilayer. 

there are proteins that work as channels and pumps that allow these molecules to pass

Explanation:

Answer 2

The polarity of the molecule determines whether a molecule can cross a cell membrane. The correct option is D.

What is polarity?

The asymmetric establishment of several cellular components, such as the plasma membrane, cytoskeleton, or organelles, is alluded to as cell polarity.

The polarity of the molecule determines whether a molecule can cross a cell membrane as the cell membrane is composed of phospholipids which are polar in nature.

Thus, the correct option is D.

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The missing options of the question are:

Speed.Texture.Mass.Polarity.

Related Questions

Chemical equilibrium results if_____.

Answers

Answer:

what he said ^

Explanation:

i think...

The stimulus interval has a profound effect on the contraction force of the muscle. In your own words explain what happened when the muscle was stimulated in rapid succession. At which interval did the volunteer's muscle twitches begin to merge together (summate)

Answers

Answer:

The skeletal muscle is stimulated by means of action potentials that are caused by the neuromotor plate. These action potentials are one after the other and can become cumulative once the muscle fibers pass the refractory phase of the action potential.

The refractory stage is that stage in which action potentials are not admitted, therefore where the muscle fibers do not accept stimuli to contract.

Once this refractory stage is over, more action potentials can be admitted, which would be summative and the muscle fiber would contract with greater power.

Explanation:

If a muscle is repeatedly stimulated, the contraction will be weaker or the muscle will fatigue more easily, triggering muscle failure.

If the muscle is stimulated with a longer pause between contraction and contraction, the action will be performed with more power.

What do eukaryotes cells have that prokaryotes do not have

Answers

Answer:

Prokaryotic cells are less structured than eukaryotic cells. They have no nucleus; instead their genetic material is free-floating within the cell. They also lack the many membrane-bound organelles found in eukaryotic cells. Thus, prokaryotes have no mitochondria. I hope this helped.

IF YOU DO NOT MIND CAN YOU MARK ME BRAINLIEST?

Answer:

true cell

Explanation:

membrane bound organelles such as the nucleus

Animals and dogs Plants absorb ____ from the atmosphere through _____

ASAP PLEASE

Answers

1. oxygen

2. nose and roots

If the current trend continues, can the temperature be expected to increase/decrease or stay the same in the next twenty years? Anssssswer please only 8 minutes left !!!

Answers

Answer:

Increase

Explanation:

The diffusion spot diameter with one crystal at 15 min ( mm) is 59 . The rate of diffusion with one crystal So how would I convert this 59 to ( mm/h)?

Answers

Answer:

This is straight forward.If  there are 60 minutes in one hour, then to convert minutes to hours as requested, simply divide the number of minutes given by  60.Thus if you divided the 59 by 60 it gives you what?round the answer to whole number.

When there is a moment of any solute present in the solution from high concentration to low concentration area is called diffusion.

It will take 0.25 hours to diffuse one crystal.

This can be calculated by:

Given,

Time for one crystal diffusion = 15 min

Diameter for one crystal diffusion  = 59 mm

In 1 hour there are 60 minutes.

60 minutes = 1 hour.

Then 15 minutes = ? hours

[tex]\dfrac{15 \; \text{minutes}}{60 \; \text{minutes}} = 0.25[/tex]

Therefore, to diffuse one crystal of it will take 0.25 hours.

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Which macromolecule is made up of nucleic acids ?
A. Sucrose
B. RNA
C. Fatty Acids
D. Protein

Answers

Answer:

Ribonucleic acid (RNA)

Explanation:

DNA (deoxyribonucleic corrosive) is the most widely recognized type of hereditary material found in numerous living beings.

Nucleic acids connect the two strands of the DNA double helix together.

RNA (ribonucleic corrosive) is additionally found as genetic material (and not DNA) in certain creatures like infections.

Infections could have ssRNA (single-stranded RNA) or dsRNA (double-stranded RNA) as their hereditary material.

However, RNA is generally single-stranded, in contrast to DNA, which is double-stranded consistently.

Another type of RNA is messenger RNA (mRNA), ribosomal RNA (rRNA), transfer RNA (tRNA), etc

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Introduction to Biology: Mastery Test
5
A student notices that when bananas are kept near other fruits, the other fruits ripen faster. She wonders what causes
more quickly and thinks that bananas must have an influence on the ripening process. She decides to perform an expe
bananas and apples and places an apple by itself at location A and an apple next to a banana at location B. She then w.
records the how ripe each apple is.
What would be the next step in this experiment?
O A
ask questions and construct a hypothesis
B.
make observations and draw a conclusion
O c.
construct a hypothesis and record data
D.
analyze the results and make a conclusion

Answers

Answer:

Explanation:

The next step in this experiment is constructing a hypothesis and recording data. The correct option is (C).

Making observations and keeping track of data would be the experiment's next phase. The learner would observe and record the ripening of both apples at locations A and B in this stage. They would have to keep track of the maturity of the apples throughout time by routinely observing and recording the changes. This could entail examining the apples visually for color, texture, and overall maturity and recording any variations between the apples at locations A (by themselves) and B (next to a banana).

The student can analyze the results and develop conclusions regarding the impact of bananas on the maturity of other fruits by gathering information on the ripening of the apples in both locations. The information can be used to prove or disprove the initial theory and assist determine whether bananas actually influence the maturity of surrounding fruits.

Hence, the correct option is (C). Construct a hypothesis and record data.

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List 3 commercial uses of sponges

Answers

The Ceramic industry. It is used for finishing on the lathe machine. ...

Home decorating/painting. The sponge buffering is a colouring technique used in DIY on furniture and accessories and on large surfaces such as walls and ceilings. ...

Footwear Manufacturers.

Answer:

Some commercial uses of sponges are

Personal hygiene: The sponge has many natural properties. It retains water, does not drip and releases water only when slight pressure is applied. Many people prefer to purchase the natural sea sponge because of its characteristics for deep cleansing the face, its ecological properties and most of all does not give allergic reactions.

Decor : In private homes, in hotels and on yachts, it is very common to see displays of natural sponges as part of furnishing.

Painting: The sea sponge is used in the restoration of art, for dry cleaning of frescoes and paintings

Hope this helps!

-Quinn <3

The fruit fly Drosophila melanogaster is an important model system for studying inheritance in animals and genetic control of animal development, including humans. Evaluate Drosophila as a model system for human biology. What are their strengths and weaknesses as a model system? g

Answers

Answer:

The correct answer is "strengths: inexpensive, easy to culture, short life cycle, large number of offspring; weaknesses: invertebrate model, some diseases such as immunological cannot be modelled, anatomical features are very different from humans"

Explanation:

The fruit fly Drosophila melanogaster is one of the most used animal model for genetic and biomedical studies. There are many advantages of using Drosophila as model, including that it is very inexpensive to handle, it is easy to culture, it has a short life cycle allowing to observe the changes in phenotype very quickly and its large number of offspring allows to include several repetitions per trait in a study. However, there are some weaknesses of using Drosophila to study human biology. First, obviously the fruit fly is very different from humans, it is an invertebrate and its anatomical features are very different, which makes impossible to model some disorders such as immunological diseases.

What are compounds called that form H+ ions when dissolved in water?

Answers

Answer:

Acid

At the simplest definition, an acid is any compound that yields hydrogen ions (H +) or hydronium ions (H 3O +) when dissolved in water. Hydronium ions are really the combination of H + ions and H 2O molecules

Explanation:

What are examples of harmful mutations

Answers

Answer:

One example of a harmful mutation is an animal's different coloring than others in its species. If a deer was albino, it would have a much harder time blending in, escaping predators and most likely have trouble finding a mate.

Explanation:

The best experimental design:______
a. alters only one condition between the controls and the experimental condition
b. includes a large sample size for each condition
c. includes a control

Answers

Answer:

The correct answer is option d. "includes a large sample size and a control, and alters only one condition between the controls and the experimental condition".

Explanation:

The correct answer for this question is missing, which is option d. "includes a large sample size and a control, and alters only one condition between the controls and the experimental condition". The best experimental design includes all the options proposed: it includes a large sample size to ensure that the data is statistically relevant; a control to verify that the results are valid and are not obtained from other untested conditions; and it alters only one condition at the time to ensure the existence of the relation between condition and results.

Samples of the octapeptide AVGWRVKS are subjected to proteolytic cleavage by either trypsin or chymotrypsin. Select the most appropriate technique for separating the digestion products of AVGWRVKS if cleaved by trypsin. salting out gel‑filtration chromatography dialysis ion‑exchange chromatography Select the most appropriate technique for separating the digestion products of AVGWRVKS if cleaved by chymotrypsin.
A. dialysis
B. gel‑filtration chromatography
C. ion‑exchange chromatography
D. salting out

Answers

The answer that you are looking for is A , Hope this is the correct answer

Answer:

If cleaved by trypsin you will need to do gel-filtration, if cleaved by chymotrypsin you will need to do ion-exchange.

Explanation:

After a polypeptide chain has been synthesized, certain amino acids in the peptide may become modified. For each modified amino acid, identify the standard amino acid from which it is derived. Enter the unabbreviated name of the standard amino acid.

Answers

Answer:

Lysine

Explanation:

Lysine is a unabbreviated name of amino acid. It is used in biosynthesis of proteins. It contains [tex]\alpha[/tex]-amino group and [tex]\alpha[/tex]-carboxylic acid group which has formula is C6H14N2O2. Lysine is also considered as building block of amino acid. It is used for treating cold sores and can be applied directly to the skin.

Why do sex-linked traits follow different patterns of inheratance than other traits

Answers

Answer:

Males and females have different sex chromosomes.

Explanation:

Sex Linked trait is controlled by the chromosomes while other traits are controlled by autosomes. The autosomal cells and traits have a constant characteristics in a human being. The chromosomal cells however vary. The male chromosome XY is different from the female chromosome XX.

This is the reason why sex-linked traits follow different patterns of inheratance than other traits as a result of the Males and females having different sex chromosomes is valid.

In experiment #2 you are asked to use the scientific method to develop and execute a method of separating a mixture of sand, salt and iron pellets. Imagine you are in a lab and notice that a plate of bacteria grow faster in the presence of sunlight. After that single observation, you come to the conclusion that sunlight causes bacteria to grow fast. What would be the next step in the scientific method for this experiment?

Answers

Answer:

1. separation can be done with help of magnetic bar and filtration.

2. the next step will be testing the hypothesis.

Explanation:

1. Separation of iron pellets from sand,  and salt first

Use a magnet

Due to magnetic force iron pallets will attach with it and separation will occur from sand and salt.

After separation of iron pallets, add water to mixture of sand and salt and heat until salt get dissolved then filter the salt water.

This will help in separating all three components of mixture to separate.

2. Bacteria growth

Hypothesis must be tested-

In this case a hypothesis and conclusion is represented. Conclusion is provided that in presence of sunlight growth of bacteria is faster. So the hypothesis must be verified by scientific experiment to be a valid theory by measuring or monitoring growth in presence of sunlight.

Your mother points out to you a magazine article that says better nutrition is the reason modern Americans are taller than Americans of two centuries ago. What is a valid statement that would contradict this?

Answers

Answer:

This is  true, because the advent of genetic engineering and different nutritional researches  have greatly enhanced  the Nutritional values in foods, with resultant increases in the growth and development of cells and tissues from increase growth hormones metabolism. However, reduction in the outbreak of disease, due to advancement in medical research and drug manufacturing are another factors which may contribute to this

Explanation:

which would provide the body with the most energy ? a.forming bonds between to amino acids b.braking the bonds in a monosaccharide c.braking a single carbon bond d.creating bonds to form a carbohydrates

Answers

Answer:

d creating bonds to form a carbohydrate

Explanation:

how much is 300000 *​

Answers

Answer:

300,000

Explanation:

It is 30% of a million and quite a bit of money that can be used to buy a house.

Answer:

300000

Explanation:

lol easyyy

list and explain the three classes of enzymes​

Answers

Answer:

Oxidoreductases, transferases and hydrolases are the most abundant forms of enzymes.

Explanation:

ASAP PLEASEEE HELP ME
Remember monomers and polymers? DNA is what type of polymer?
A.) Protein
B.) Nucleic Acid
C.) Lipid
D.) Carbohydrate

Answers

Answer:

polynucleotide "carbon" sugar so I would say B or D

Explanation:

In each of the scenarios, an individual heterozygous for the indicated gene or genes is crossed with an identical heterozygous individual. Predict the number of different phenotypes that would be observed among the progeny of such a cross.

Scenario 1 : R is completely dominant to r.
Scenario 2: R is codominant with r.
Scenario 3: R and S are completely dominant to rand s, respectively; R and S are linked by 15 m.u. and do not interact with each other.
Scenario 4: Genes R and S perform the same function; R and S are completely dominant to r and s, respectively; and R and S are unlinked.
Scenario 5: R and S are completely dominant to r and s, respectively; R and S are linked by 10 m.u. and show dominant epistasis.

Answers

Answer:

Explanation:

Scenario 2: R is codominant with r.

Scenario 3: R and S are completely dominant to rand s, respectively; R and S are linked by 15 m.u. and do not interact with each other.

Scenario 4: Genes R and S perform the same function; R and S are completely dominant to r and s, respectively; and R and S are unlinked.

Scenario 5: R and S are completely dominant to r and s, respectively; R and S are linked by 10 m.u. and show dominant epistasis.

3. What is the name of the process by which evolution occurs?​

Answers

Answer:

Evolution is the process of genetic change from one generation to the next and may be caused by several methods. In essence, evolution occurs when some individuals or some alleles (gene types) reproduce themselves more than others,increasing their prevalence in subsequent generations.

Explanation:

What happens during G2 phase?

Answers

Answer:

Gap 2 (G2): During the gap between DNA synthesis and mitosis, the cell will continue to grow and produce new proteins.

Answer provided by CELLS Alive

What are the characteristics of erythrocytes? Erythrocytes contain a nucleus, mitochondria, and ribosomes. Erythrocytes synthesize proteins. Erythrocytes can change shape to squeeze through microcirculation. Erythrocyte proliferation is stimulated by erythrocyte colony-stimulating factor (E-CSF).

Answers

Answer:

Erythrocytes can change shape to squeeze through microcirculation.

Explanation:

Deformability is the ability of the red blood cells to change shape so as to enable them squeeze through tight or small spaces including capillaries.

Shortly after a stream dried up, you noticed a change in the field mouse population coat color variation. When the stream was flowing, there were two populations, one with darker coats and one with lighter coats. After the stream dried up, mice with darker coats were being born into the lighter coat population and vice versa.

a. True
b. False

Answers

Answer:

a. True

Explanation:

When the stream dried up darker coat mice were seen into the lighter coat population and vice versa because of the natural selection process.

Mice change their coat color by adapting the changes in the stream flow and evolve their coat either dark or light that provides camouflage so predators won’t see them and they are able to survive in the environment. Mice have the advantage of surviving long and they are able to pass their genes to the offspring.

Hence, the given statement is true.    

If you have a concern about fluoride in your drinking water, how do you get more information?

Answers

Answer:

Contact the Centers for Disease Control and Prevention (CDC).

Explanation:

What is one reason why we study properties of minerals?

SCIENCE

Answers

Answer:

To identify minerals.

Explanation:

That way, we can know which minerals react to which tests.

-Bella,

BrainlyBluebell

The study’s of people

Building large manufacturing facilities can affect
ecosystems by increasing the

Answers

Answer:demand for resources such as fossil fuels

Explanation:

Building large manufacturing facilities can affect ecosystems by increasing the demand for resources such as fossil fuels.

Thus, The breakdown of buried, carbon-based organisms that perished millions of years ago produces fossil fuels. They produce deposits rich in carbon, which are taken out and burned to provide energy.

They presently provide about 80% of the world's energy and are non-renewable. A vast array of items, including plastic and steel, are also produced using them. Coal, oil, and gas are the three forms of fossil fuels.

Global warming is mostly caused by emissions from fossil fuels, according to the Intergovernmental Panel on Climate Change (IPCC). 89% of the world's CO2 emissions in 2018 came from industry and fossil fuels.

Thus, Building large manufacturing facilities can affect ecosystems by increasing the demand for resources such as fossil fuels.

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