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Biochem Exam 4
Biochem Exam 4
32
Biology
Graduate
04/27/2010

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Term
In nitrogen fixation, atmospheric nitrogen___is chemically changed to ___.
Definition
N2 to NH3
Term
Nitrogen fixation is the conversion of ___
Definition
nitrogen gas to ammonia
Term
Nitrogen fixation is carried out by
Definition
soil bacteria
Term
Nitrogen fixation cycle has these four steps:
Definition
fixation of atmospheirc nitrogen to ammonia; fixation of atmospheric nitrogen into nitrate; nitrification of soil nitrate into ammonia; denitrification of nitrogen oxides to gaseous nitrogen
Term
The nitrogen-fixing enzyme system, nitrogenase, is found exclusively in...
Definition
bacteria
Term
How many ATP are required for the production of one ammonia molecule (NH3) from one nitrogen molecule (N2)?
Definition
16 ATP
Term
What is not a component of the nitrogenase complex?
Definition
pyridoxal phosphate
Term
Nitrogen fixation cannot be accomplished by plants directly, rather it is done by bacteria or other microorganisms that live on the plants. TRUE/FALSE
Definition
TRUE
Term
The conversion of glutamate to glutamine is catalyzed by glutamine synthetase requires ATP. TRUE/FALSE
Definition
TRUE
Term
A metabolic intermediate that is not a precursor for an amino acid family is...
Definition
glyceraldehyde-3-phosphate
Term
Which amino acid does NOT use glutamic acid as a precursor?
Definition
lysine
Term
The serine family of amino acids includes synthesis of all the following amino acids:
Definition
serine; glycine; cysteine
Term
In animals, the synthesis of cysteine does NOT involve...
Definition
the addition of a carbon group to glycine.
Term
Isoleucine, leucine, and valine are all formed from the same amino acid root, aspartic acid. TRUE/FALSE
Definition
FALSE
Term
Essential amino acids cannot be synthesized within the human body. TRUE/FALSE
Definition
TRUE
Term
Some amino acids can only be made in small quantities in humans and must be supplemented in the diet in children or during repair of injured tissue. TRUE/FALSE
Definition
TRUE
Term
Cereals are fortified with lysine, since grain foods are naturally low in the essential amino acids. TRUE/FALSE
Definition
TRUE
Term
Executives in the food industry tend to market a product as "high in protein", since they have added a few essential amino acids. Technically, is their claim correct?
Definition
NO
Term
In the urea cycle which molecule, that is synthesized in the cytosol, meets with the carbamoyl phosphate, which is made in the mitochondrial matrix, for subsequent reactions.
Definition
ornithine
Term
Arginine...
Definition
is only partially an essential amino acid, since it is made in the urea cycle.
Term
The urea cycle is linked to the citric acid cycle by the cleavage of
Definition
fumarate
Term
Which amino acid is not an intermediate in the urea cycle? Arg, citrulline, ornithine, lysine
Definition
lysine
Term
Which two amino acids are key to the transfers of amino groups during breakdown and synthesis of amino acids?
Definition
GLU and GLN
Term
High protein diets in humans result in the following:
Definition
activation of nitrogen metabolism and activation of urea cycle
Term
Which of the following amino acids is NOT glucogenic? glycine; alanine; aspartic acid; leucine
Definition
leucine
Term
Mammals produce this/these as the major nitrogen waste products.
Definition
Urea, Uric acid, and ammonia
Term
Since nitrogen metabolism depends on the organism's availability of water, nitrogen waste is predominantly removed from the body by:
Definition
urine
Term
Would you recommend a high protein diet for the long distance runner during a race, since metabolism would depends on the availability of water?
Definition
NO
Term
If an amino acid's degradation pathway leads to alpha-ketoglutarate, is it glucogenic?
Definition
YES
Term
The two nitrogens to make urea in the urea cycle arise directly from:
Definition
the nitrogens from carbamoyl phosphate and aspartic acid
Term
Which amino acid biosynthesis is associated with nucleotide biosynthesis?
Definition
histidine
Term
The reduction of atmospheric N2 to NH3 occurs on which subunit of nitrogenase?
Definition
molybdenum-iron-sulfur complex
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