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.

I would think it's D

Explanation:

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

b

explanation:

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