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Multiple Choice
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1

Mitochondria:
A)Contain DNA
B)Contain RNA
C)Grow and divide
D)Were once bacteria
E)All of the above
2

The terminal electron acceptor in electron transport is:
A)CO2
B)ATP
C)H2O
D)O2
E)NAD+
3

The initial step in the metabolism of amino acids is typically:
A)Decarboxylation
B)Removal of the amino group
C)Oxidation of the carbon skeleton
D)There is no general pattern
4

The carbon skeletons of the majority of the amino acids are metabolized by entry into:
A)Glycolysis
B)Electron transport
C)b-oxidation
D)The Kreb's cycle
E)Gluconeogensis
5

Transmination reactions involve the:
A)Transfer of a carboxyl group from one amine to another
B)Transfer of a carbonyl from one carboxylic acid to another
C)Transfer of an amino group from one keto acid to another
D)Transfer of an amino from one carboxylic acid to another
E)Moving of an amino and carboxylate group from one alkane chain to another
6

What vitamin is involved in transamination reactions?
A)B6
B)B12
C)C
D)D
E)A
7

The oxidative deamination of an amino acid produces:
A)N2
B)NO
C)NO2
D)N2O5
E)NH4+
8

Examine the reaction for the formation of carbamyl phosphate. What unwritten biochemical dogma appears to be violated in this reaction?
A)Involvement of both NH4+ and Pi in the same reaction
B)Involvement of CO and Pi in the same reaction
C)Involvement of two molecules of ATP in the same reaction
D)Involvement of CO2 and NH3 in the same reaction
9

The conversion of arginine into ornithine and urea is best described as:
A)An oxidation
B)A reduction
C)A hydration
D)A dehydration
E)A hydrolysis
10

As a nitrogen waste product, urea has several advantages over products (ammonia and uric acid) used by other organisms. Which of the following is the most significant "problem" associated with urea?
A)Urea affects the pH of solutions
B)Urea is somewhat insoluble and causes crystallization (stone development)
C)Requires water for disposal
D)Has an odor of ammonia
11

The major site for urea biosynthesis in mammals is in the:
A)Bladder
B)Kidneys
C)Liver
D)Lungs
E)Pancreas
12

The conversion of argininosuccinate into arginine and fumarate is best described as a ______reaction.
A)Oxidation
B)Reduction
C)Hydrolysis
D)Dehydration
E)Cleavage





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