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zimovet [89]
2 years ago
12

Which of the following statements about transmembrane proteins is correct?They usually have one or more helical regions spanning

the membrane bilayer.They are always inserted with the amino terminus on the lumenal side and the carboxyl terminus in the cytosol.They are always inserted with the carboxyl terminus on the lumenal side and the amino terminus in the cytosol.The signal sequences are always cleaved off.They can cross the membrane only once.
Biology
1 answer:
faltersainse [42]2 years ago
7 0

The correct answer is: They usually have one or more helical regions spanning the membrane bilayer

Transmembrane proteins are type of integral proteins meaning that they are permanently attached to biological membrane. Transmembrane proteins span through the plasma membrane so most of their structure is hydrophobic.

The major role of these proteins is transport role: they act as a channels that undergo conformational change in order to  move a substance through the membrane.

Classified by their structure they can be put into two types: alpha helical and beta barrels.

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Answer:

B

Explanation:

Wall cell has to be strong to bring protection to the cell. In general it is made of beta-glycosidic bonds.

Storage polysaccharides, are a source of available energy for the cell in any moment. Therefore, the bonds of storage polysaccharides need to be weak. In that way, when the cell needs energy from carbohydrates, it is not going to spend so much energy trying to break the bond.  

 

8 0
3 years ago
Dr. Nachman and his colleagues collected rock pocket mice across 35 kilometers of the Arizona Sonoran Desert, which included bot
vlada-n [284]

Answer:

1)

  • frequencies of light-colored mice  ≅ 0.74
  • frequencies of dark-colored mice ≅ 0.26

2)

  • frequencies of light-colored mice ≅ 0.13
  • frequencies of dark-colored mice ≅ 0.87

3)

  • q² = 0.74
  • p² = 0.02
  • 2pq = 0.24      

4)

  • q² = 0.13
  • p² = 0.4
  • 2pq = 0.46

5)

The dark-colored fur seems to have the greatest overall selective advantage

6)

Dark lava, that changed the color of the substrate, from light to dark.

7)

Because to produce dark color, animals from the different regions suffered different mutations that drove them to have almost the same dark fur color. All of the animals are inhabiting dark substrate, which means that this environmental condition is favoring the same phenotype.

8)

To see if the mice population is evolving, you need to take a sample of animals per year, through many years, and analyze if it is changing or not. If the population is evolving, you will notice a change in the allelic and genotypic frequencies over the years, favoring one genotype or the other. If the population is not evolving, the frequencies will keep equal through the years, it will not change.

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf
8 0
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saveliy_v [14]
Water pollution is answer.
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3 years ago
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Answer:

This is the lytic cycle.

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Hope this helps!

4 0
3 years ago
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Vedmedyk [2.9K]

Answer:

C

Explanation:

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2 years ago
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