Question

1. which of the following vitamins is a component of coenzyme a?

pantothenic acid
niacin
vitamin b - 6
riboflavin

1. each of the following nutrients can be utilized for energy except ______.

proteins
vitamins
lipids
carbohydrates

1. cells of the central nervous system (cns) are most dependent on ______ as a source of energy.

glucose
fatty acids
amino acids
minerals

Explanation:

1. Coenzyme A is synthesized from pantothenic acid (vitamin B5). Niacin is part of NAD+/NADP+ coenzymes, vitamin B - 6 is involved in amino - acid metabolism (e.g., transamination), and riboflavin is part of FAD/FMN coenzymes.
2. Proteins, lipids, and carbohydrates can be broken down to release energy (they are macronutrients). Vitamins are micronutrients that do not provide energy; they play roles as coenzymes or in other metabolic functions.
3. Under normal physiological conditions, central nervous system (CNS) cells rely mainly on glucose for energy. Fatty acids have limited access to the CNS (due to the blood - brain barrier), amino acids are not the primary energy source for CNS cells under normal conditions, and minerals do not provide energy.

Answer:

1. Pantothenic acid
2. vitamins
3. glucose