26. The vitamin riboflavin is part of the __________ molecule.
A. ferredoxin
B. FAD
C. pyridoxal phosphat
D. pyrophosphate
27. The most prominent role that tocopherol has in in-vitro systems is as a strong
A. antioxidants
B. reducing agent
C. oxidizing agent
D. all of these
28. Biotin occurs mainly in combined forms bound to protein through
A. ε-N-lysine moiety
B. ε-S-lysine moiety
C. ε-N-biotinyl-L-lysine
D. ε-N-lipoyl – L-lysine
29. Lipoic acid is a co-factor of the
A. pyruvic dehydrogenase
B. α-ketoglutaric dehydrogenase
C. both (a) and (b)
D. di-hydroorotate dehydrogenase
30. β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by
A. plants
B. animal
C. plants and animals both
D. none of these
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