Question

1. Which of the following amino acids is properly paired with a property?

Question options: a) glycine: contains a polar R group

b) proline: presence in polypeptide may cause abrupt change in direction and/or restricted geometry

c) leucine: basic amino acid d) aspartate: generally positively charged at neutral pH

e) valine: an amino acid that is ideal for the transfer of protons within the catalytic site of enzymes due to the presence of significant amounts of both the protonated and deprotonated forms of its side chain at biological pH

2. Which of the following is correct regarding lipids? Question options:

a) All hydrolyzable lipids contain one or more amide linkages.

b) The major function of nonhydrolyzable lipids is to serve as efficient energy stores.

c) All nonhydrolyzable lipids are arachidonic acid derivatives.

d) All hydrolyzable lipids contain one or more fatty acids components.

e) More than one of the above are correct.

3. The rate at which the cell synthesizes RNA in E. coli is greatest for ________ RNA while the most abundant type of RNA is _________.

Question options:

a) messenger; ribosomal

b) ribosomal; messenger

c) transfer; ribosomal

d) transfer; transfer

e) None of the above

Thank you so much for your help!

Answer 1

Ans 1 . b ) Proline : presence in polypeptide may cause abrupt change in direction and/ or restricted geometry.

Proline is the alpha amino acid with a side chain pyrrolidine, which classifies it as a non polar aliphatic amino acid . Its side chain to the protein backbone twice formine a five membered nitrogen containing ring . It can adopt to many main chain conformations due to which it is found in very tight turns of protein structures , where the polypeptide molecule changes its direction .