41. The occurrence of metals such as iron or molybdenum in some flavoproteins can

A. stabilize the semiquinone
B. de-stabilize the semiquinone
C. form chelation
D. all of these

42. Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

A. both ends by one disulfide bond
B. either end via two disulfide bonds
C. either end via a single disulfide bond
D. both ends by two disulfide bonds

43. A deficiency of niacin causes

A. pellagra
B. scurvy
C. cataract
D. anemia

44. Selenium is an essential component of the enzyme glutathione peroxidase which

A. scavenges toxic hydoperoxycompounds in tissues
B. reduces toxic hydoperoxycompounds in tissues
C. oxidizes toxic hydoperoxycompounds in tissues
D. none of the above

45. Who discovered vitamin C (ascorbic acid)?

A. Paul Berg
B. Linus Pauling
C. Albert Szent-Gyorgyi
D. Kerry Mull is