Question

1. milk contains a high concentration o carbohydrate lactose. what is the basi block of lactose? a. two monosaccharides joined to b. a chain of amino acids in a heli c. two fatty acids joined to a phos group d. a chain of alternating sugar and phosphate groups

Explanation:

To solve this, we analyze each option:

• Option A: Lactose is a disaccharide, which is formed by two monosaccharides (glucose and galactose) joined together. This matches the structure of lactose.
• Option B: A chain of amino acids in a helix is related to proteins (like alpha - helices in proteins), not carbohydrates like lactose. So this is incorrect.
• Option C: Two fatty acids joined to a phosphate group describes a phospholipid, which is a lipid, not a carbohydrate. So this is incorrect.
• Option D: A chain of alternating sugar and phosphate groups is part of the structure of nucleic acids (like DNA or RNA), not carbohydrates. So this is incorrect.

Answer:

A. Two monosaccharides joined together