Write the biochemical role of the following:
(a) Thiamin
(b) Vitamin B12
(c) Ascorbic acid
(d) Vitamin K
(a) Thiamin: Thiamin (Vitamin B1) acts as a coenzyme in the metabolism of carbohydrates. It is a part of the coenzyme thiamine pyrophosphate (TPP), which is essential for the decarboxylation of alpha-keto acids, such as pyruvate to acetyl-CoA. This reaction is important in energy production, particularly in the citric acid cycle. Thiamin deficiency can lead to diseases such as beriberi and Wernicke-Korsakoff syndrome, which affect the ________ ________ ____ _________ ___ ___ _________ _________.
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