Question

question 10
carbohydrates and proteins are built up from their basic building blocks by the ______.
removal of a carbon atom between each two units
addition of a water molecule between each two units
addition of a carbon atom between each two units
removal of a water molecule between each two units
clear selection
question 11

Explanation:

To determine how carbohydrates and proteins are built from their basic units, we recall the process of polymerization. For both carbohydrates (monosaccharides forming polysaccharides) and proteins (amino acids forming polypeptides), the process is dehydration synthesis (or condensation reaction), where a water molecule is removed between two units to form a covalent bond.

• The first option is incorrect as carbon atom removal is not part of this process.
• The second option is incorrect because adding a water molecule is hydrolysis (breaking down), not building up.
• The third option is incorrect as carbon atom addition is not involved.
• The fourth option (removal of a water molecule between each two units) matches the dehydration synthesis process.

Answer:

D. removal of a water molecule between each two units