Which B vitamin is critical for DNA synthesis and cell division during the cell cycle?

• A. Vitamin B1
• B. Vitamin B6
• C. Vitamin B12
• D. Vitamin B2

Answer: (C)

Verified step by step guidance

1. Begin by understanding the role of B vitamins in cellular processes. B vitamins are essential for various metabolic functions, including energy production and the synthesis of nucleic acids.
2. Focus on the process of DNA synthesis and cell division. These processes are crucial during the cell cycle, particularly in the S phase where DNA replication occurs.
3. Identify which B vitamin is specifically involved in DNA synthesis and cell division. Vitamin B12, also known as cobalamin, is critical for these processes as it is involved in the synthesis of nucleotides, the building blocks of DNA.
4. Consider the biochemical pathways that require Vitamin B12. It acts as a coenzyme in the conversion of homocysteine to methionine, which is necessary for the production of S-adenosylmethionine, a compound involved in DNA methylation and synthesis.
5. Conclude that Vitamin B12 is essential for maintaining healthy cell division and DNA synthesis, making it critical during the cell cycle.