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Vitamins and Coenzymes

Vitamins and Coenzymes
An example of a digestive hormone is

gastrin
pepsin
amylase
lipase

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

NADH and FADH2
ATP and GTP
NAD+ and FAD
Coenzyme A and ubiquinone

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Vitamins and Coenzymes
The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin

B12(Co+)to B12(Co2+)
B12(Co2+)to B12(Co)
B12(Co2+)to B12(Co+)
B12(Co) to B12(Co2+)

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Vitamins and Coenzymes
Selenium is an essential component of the enzyme glutathione peroxidase which

reduces toxic hydoperoxycompounds in tissues
scavenges toxic hydoperoxycompounds in tissues
oxidizes toxic hydoperoxycompounds in tissues
None of these

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Vitamins and Coenzymes
An enzyme, L-folate reductase reduces folic acid to

trihydrofolic acid
dihydrofolic acid
hydrofolic acid
tetrahydrofolic acid

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Vitamins and Coenzymes
The occurrence of metals such as iron or molybdenum in some flavoproteins can

stabilize the semiquinone
form chelation
all of these
de-stabilize the semiquinone

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