Question

multiple choice question
what is true about vitamin b₁₂, copper and folic acid?

○ they bind and transport iron.

○ they are all required for erythropoiesis.

○ they are all found in leukocyte granules.

○ they are necessary to maintain blood ph.

Explanation:

• Analyze each option:
• Option 1: Molecules that bind and transport iron are like transferrin, not vitamin B₁₂, copper, or folic acid. Eliminate.
• Option 2: Erythropoiesis (red blood cell production) requires vitamin B₁₂, folic acid (for DNA synthesis in erythroblasts), and copper (involved in iron metabolism for hemoglobin synthesis). This is correct.
• Option 3: Leukocyte granules contain substances like enzymes, not these nutrients. Eliminate.
• Option 4: Buffers (e.g., bicarbonate) maintain blood pH, not these nutrients. Eliminate.

Answer:

B. They are all required for erythropoiesis.