Question

40. which part of the phospholipid molecule is hydrophilic (water - loving)?
a) phosphate group
b) proteins
c) fatty acid tail
d) both the head and the tail
41. which of the following is the monomer of proteins?
a) amino acids
b) fatty acids
c) monosaccharides
d) nucleotides

1. what level of protein structure involves the folding of a polypeptide chain into a three - dimensional shape?

a) primary structure
b) quaternary structure
c) tertiary structure
d) secondary structure

Explanation:

For question 40, the phosphate - group of a phospholipid is hydrophilic due to its polar nature which allows it to interact with water. For question 41, amino acids are the building blocks (monomers) of proteins. For question 42, the tertiary structure of a protein involves the folding of a polypeptide chain into a three - dimensional shape.

Answer:

1. a) Phosphate group
2. a) Amino acids
3. c) Tertiary structure