Question

Which of these molecular structures could be found in a lipid, but not in a carbohydrate, protein, or nucleic acid?
Responses

An amino group and a carboxyl group bonded together
An amino group and a carboxyl group bonded together

A long chain of carbon, nickel, and nitrogen atoms
A long chain of carbon, nickel, and nitrogen atoms

A phosphate group joined to a chain of nitrogen atoms
A phosphate group joined to a chain of nitrogen atoms

A long chain made only of carbon and hydrogen atoms (hydrocarbon chain)
A long chain made only of carbon and hydrogen atoms (hydrocarbon chain)

Answers

GPT-4o mini
The correct response is:

**A long chain made only of carbon and hydrogen atoms (hydrocarbon chain)**

This structure is characteristic of lipids, particularly fatty acids, which typically have long hydrocarbon chains. In contrast, carbohydrates, proteins, and nucleic acids do not have structures that are exclusively made of long chains of carbon and hydrogen atoms.