Question

select the answer that correctly identifies the macromolecules 1, 2, 3, and 4 below.
a. (1) lipid (2) protein (3) nucleic acid (4) carbohydrate
b. (1) carbohydrate (2) lipid (3) protein (4) nucleic acid
c. (1) protein (2) nucleic acid (3) carbohydrate (4) lipid
d. (1) nucleic acid (2) carbohydrate (3) lipid (4) protein

Explanation:

• Macromolecule (1): The structure is a polysaccharide (carbohydrate) as it has a chain - like structure made of monosaccharide units (elements C, H, O).
• Macromolecule (2): The structure is a lipid (phospholipid in the cell membrane). Lipids are made of C, H, O (with some having additional elements like P in phospholipids).
• Macromolecule (3): The structure is a protein. Proteins are made of amino acids (elements C, H, O, N).
• Macromolecule (4): The structure is a nucleic acid (DNA). Nucleic acids are made of nucleotides (elements C, H, O, N, P).

Answer:

B. (1) carbohydrate (2) lipid (3) protein (4) nucleic acid