It is often possible to predict the number of times a membrane protein crosses the membrane by determining how many short sequences of hydrophobic amino acids are present in the amino acid sequence of the protein. Choose the correct explanation. It is often possible to predict the number of times a membrane protein crosses the membrane by determining how many short sequences of hydrophobic amino acids are present in the amino acid sequence of the protein. Choose the correct explanation. a. Sequences of hydrophilic amino acids are the segments of the protein that span the membrane.
b. Sequences of hydrophobic amino acids are the segments of the protein that span the membrane.
c. Sequences of hydrophobic amino acids are the segments of the protein that dissolve in the membrane.
d. Sequences of hydrophilic amino acids are the segments of the protein that dissolve in the membrane.

The answer is (b). The hydrophobic sequence of AA is not electrically charged so it isn't soluble in water that means it spans the membrane. The

hydrophilic sequences are attracted by water and they remain in the aqueous enviornments on the two sides of the membrane. This diagram should clarify.

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