Question

which of these molecular structures could be found in a lipid, but not in a carbohydrate, protein, or nucleic acid? a long chain of carbon, oxygen & nitrogen atoms a long chain made only of carbon & hydrogen atoms a phosphate group joined to a chain of carbon atoms an amino group and a carboxylic group bonded together

Explanation:

Lipids often have long - hydrocarbon chains (chains made only of carbon and hydrogen atoms). Carbohydrates typically have a ratio of carbon, hydrogen, and oxygen close to 1:2:1. Proteins contain nitrogen in their amino - acid structure. Nucleic acids have phosphate groups and nitrogen - containing bases. A long chain made only of carbon and hydrogen atoms is characteristic of lipids and not of the other macromolecules mentioned.

Answer:

B. a long chain made only of carbon & hydrogen atoms