Which statement explains the passage of a serine, an amino acid through the selectively permeable plasma membrane?

Which statement explains the passage of a serine, an amino acid through the selectively permeable plasma membrane?

A)

This molecule is too large to pass through the cell membrane.

B)

This molecule can pass through the cell membrane using a protein pump

and ATP.

C)

This molecule would easily pass through the phospholipid bilayer, due to

the polar side chains.

D

This molecule must utilize a transport protein to cross the cell membrane

due to its large size and polar side chains.

Explanation:

i believe it would be the lungs.

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure