21. Vitamin-C is considered as a

A. water soluble
B. fat soluble
C. fat and water soluble
D. none of these

22. The vitamin niacin is part of the __________ molecule.

A. ferredoxin
B. pyridoxal phosphate
C. pyrophosphate
D. NAD⁺

23. Which of these hormones is a catecholamine?

A. Follitropin
B. Norepinephrine
C. Tetraiodothyronine
D. Tetrahydrofolate

24. Dihydroorotate dehydrogenase contains

A. 4 flavins and 4 atoms of iron per molecule
B. 2 flavins and 4 atoms of iron per molecule
C. 2 flavins and 2 atoms of iron per molecule
D. 4 flavins and 2 atoms of iron per molecule

25. E.coli ACP has its molecular weight as around

A. 9000
B. 19000
C. 39000
D. 90,000