Question

which of these statements describes how monomers combine and create macromolecules?
monosaccharides combine to make carbohydrates
amino acids combine to make nucleic acids
glucose molecules combine to make lipids
nucleic acids combine to make starch

Explanation:

• For the option "Amino acids combine to make nucleic acids": Amino acids are the monomers of proteins, while nucleotides are the monomers of nucleic acids, so this is incorrect.
• For the option "Glucose molecules combine to make lipids": Glucose (a monosaccharide) is used to make carbohydrates (like starch, glycogen), and lipids are made from fatty acids and glycerol, so this is incorrect.
• For the option "Nucleic acids combine to make starch": Nucleic acids are involved in genetic information, and starch is a carbohydrate made from monosaccharides, so this is incorrect.
• For the option "Monosaccharides combine to make carbohydrates": Monosaccharides (e.g., glucose, fructose) are the monomer units, and they combine through dehydration synthesis to form disaccharides, polysaccharides (carbohydrates), so this is correct.

Answer:

A. Monosaccharides combine to make carbohydrates