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Elden [556K]
3 years ago
12

Which feature of a cell membrane determines whether molecules can cross the membrane?

Biology
1 answer:
aleksklad [387]3 years ago
3 0

Answer:

my guess is phospholipids

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Elevated carbon dioxide levels have been shown to contribute to the greenhouse effect, resulting in an increase in mean global t
andrew-mc [135]

Answer:

C

Explanation:

Ice-covered surfaces are highly reflective of the sun's rays therefore prevent those areas from warming as much as the areas where the ice is replaced with darker, less reflective surfaces which absorb heat and thus contribute more to global warming. Albedo is the percentage of radiation reflected by the earth's surface. Clear surfaces have greater albedo values than dark surfaces.

7 0
3 years ago
A quotient is undefined. what does this mean
k0ka [10]
The quotient is not an integer except the dividend is an integer multiple of the divisor which is for instance 26 cannot be divided by 11 to give an integer to one lateral from division by zero presence undefined, such a situation usage one of five methods that 26 cannot be divided by 11 in which division come to be a partial function.
3 0
3 years ago
A) How does HIV bind to a host cell?
Taya2010 [7]

1. The correct answer is: The viral envelope proteins interact with CD4 and a co-receptor on the cell membrane.

Binding and entering the host cell are the first steps of the HIV virus infection. So, these steps play a major role in determining the ability of HIV to degrade the human immune system. Binding of HIV to CD4+ T lymphocytes (express chemokine receptors CCR5 and CXCR4 called co-receptors) triggers the fusion of the viral and host cell membranes, initiating infection (viral core gets into the cytoplasm).

Attachment of the virion can be:

• Nonspecific-envelop protein of the virus (Env) binds to cell-surface heparan sulfate proteoglycans

• Specific-Env binds to integrin.

2. The correct answer is: Activation of the host cell by cytokines, growth factors, or antigens.

After the viral capsid enters the cell, single-stranded RNA genome is released from the attached viral proteins and copied it into a complementary DNA (cDNA) molecule thanks to an enzyme called reverse transcriptase. Next step is the integration of the viral DNA into the host cell's genome. This process is done by another viral enzyme called integrase. The integrated DNA  is transcribed into RNA and then translated into proteins that will help the package of new viruse particles.

3. The answer is: false

Reverse transcriptase is an enzyme that catalyzes the formation of DNA from an RNA template. Since the genome of the virus (HIV) is single stranded RNA, reverse transcriptase copies it into a complementary DNA (cDNA) molecule. Thanks to this enzyme, formed cDNA can be integrated into host’s genome. Because of this proprety, antiretroviral drugs used to treat HIV infection work as reverse-transcriptase inhibitors.

7 0
3 years ago
Mitosis is just one small part of the cell cycle! Describe what would occur if cells were in mitosis more than they were in inte
OLEGan [10]

Answer:

Mitosis is just one small part of the cell cycle. What would occur if cells were in mitosis more than they were in interphase? They would grow and duplicate too rapidly. ... When a cell seperate incorrectly so you don't get the right number of chromosomes.

7 0
2 years ago
Read 2 more answers
Why do all humans have similar features?
AfilCa [17]

Answer:

I believe the answer is “B” They have the same number and kinds of chromosomes.

Explanation:

we all have 46 chromosomes.

Hope this help

Plz mark brainliest

Have a nice day!!!!!!!!

7 0
3 years ago
Read 2 more answers
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