Final answer:
Thiamine (B₁) is involved in gluconeogenesis, leucine metabolism, energy production, and fat synthesis.
Step-by-step explanation:
Thiamine (B₁)
Thiamine is involved in various metabolic processes, including gluconeogenesis, leucine metabolism, energy production, and fat synthesis.
Riboflavin (B₂)
Riboflavin is not directly involved in the mentioned processes.
Niacin (B3)
Niacin is involved in energy production but not directly in gluconeogenesis, leucine metabolism, or fat synthesis.
Biotin (B7)
Biotin is involved in gluconeogenesis, leucine metabolism, energy production, and fat synthesis.
Thiamine (B₁)
Thiamine is involved in all the mentioned processes, including gluconeogenesis, leucine metabolism, energy production, and fat synthesis.