Question

this figure is an example of a(n) _______. steroid nucleic acid saturated fat protein unsaturated fat

Explanation:

Saturated and unsaturated fats have long - chain fatty acids but lack the peptide bonds shown. Steroids have a characteristic four - ring structure not present here. Nucleic acids contain sugar, phosphate, and nitrogenous bases, which are not evident. The structure shows peptide bonds (the -CO - NH - linkages) which are characteristic of proteins.

Answer:

D. protein