Carbon in the One-Carbon Pool Can Be in the 5-Methyl-THF

question 34

Multiple Choice

Carbon in the one-carbon pool can be in the 5-methyl-THF form or the 5,10-methylene-THF form. Which statement is FALSE?

• A) Both forms of carbon (methyl and methylene) can be used directly for thymidylate synthesis.
• B) The methylene group of 5,10-methylene-THF can be oxidized to generate 5-methyl-THF and vice versa.
• C) B₁₂ is a cofactor for utilization of the methyl group in the conversion of homocysteine to methionine.
• D) More than one is false.

---

Definitions:

Additive Effects

The influence of individual genes on trait variation where the overall effect is the sum of the effects from each allele.

Dominance Effects

Genetic interactions where one allele masks or suppresses the expression of another allele at the same locus.

G × E Interactions

Genetic and Environmental interactions, which describe how genetic makeup and environmental factors influence the phenotype or traits of an organism.

Phenotypic Variation

The observable differences in appearance, physiology, and behavior among individuals of the same species, resulting from genetic and environmental factors.