Question

1. choose the best answer. look at this picture. what type of biomolecule is it? molecular structure diagram: h-n(h)-c(h)-c(=o)-n(h)-c(ch₃)(h)-c(=o)(oh) options: nucleic acid, carbohydrate, protein, lipid

Explanation:

To determine the biomolecule, we analyze the structure:

• Nucleic acids (like DNA/RNA) have nucleotide structures (sugar, phosphate, base), not seen here.
• Carbohydrates have a general formula of \( C_n(H_2O)_n \) (sugars, starches) and lack the peptide - like linkage shown.
• Proteins are made of amino acids linked by peptide bonds (\( -CO - NH - \)). The structure shows a peptide bond (between the carbonyl of one amino acid and the amino of another) and amino acid - like groups (amine, carboxyl, R - group like \( CH_3 \)), consistent with a protein (or peptide) structure.
• Lipids are non - polar, often have long hydrocarbon chains or glycerol - fatty acid structures, not matching this.

Answer:

protein