Question

Which of these illustrates the secondary structure of a protein?

a. A structure with helical and sheet regions.
b. An organic compound consisting of two globular subunits, which contain spiral and straight parts.
c. A linear sequence of monomersA special globular structure which is formed of spiral and straight regions.
d. An organic compound containing one amine and one carboxyl functional group attached to one carbon atom of the molecule.

Answer 1

The secondary structure of a protein includes α-helix and β-pleated sheet formations, maintained by hydrogen bonds, and option (a) A structure with helical and sheet regions best represents this.

Step-by-step explanation:

The question asks about the secondary structure of a protein, which refers to the local folding of the polypeptide chain into highly regular sub-structures. The two main types of secondary structure are the α-helix (alpha helix) and the β-pleated sheet (beta sheet). These structures are stabilized by hydrogen bonds between the carbonyl oxygen of one amino acid and the amide hydrogen of another amino acid that is four residues further along the chain.

Given the answer choices provided, the one that best illustrates the secondary structure of a protein is:

a. A structure with helical and sheet regions.

This option directly refers to the characteristic helical (α-helix) and sheet (β-pleated sheet) structures that define the secondary level of protein structure.

Answer 2

I would think it's D

Step-by-step explanation:

secondary structure is formally defined by the pattern if hydrogen bonds between the amino hydrogen and carboxyl oxygen atoms in the peptide backbone.