BMB 402 Final Exam Practice Questions and Exact Answers.
What is nitrogen fixation?
a. The reduction of NO3− to NH4+.
b. The formation of NH4+ from N2 gas.
c. The oxidation of NH4+ to N2.
d. The oxidation of NH4+ to NO3−.
e. The formation of NO2− from NO3−. correct answers b. The formation of NH4+ from N2 gas.
The involvement of ATP in the nitrogenase complex is because ATP is needed to:
a. provide electrons.
b. phosphorylate the enzyme.
c. break the N2 triple bond.
d. transfer electrons from ferredoxin.
e. all are true. correct answers c. break the N2 triple bond.
In plants and microorganisms, amino acid biosynthesis is a matter of synthesizing the appropriate
____ followed by transamination with ____.
a. acetyl-CoA derivatives; glutamine
b. α-ketoacid; glutamate
c. phospho-carbon skeleton; alanine
d. nitrogenous base; glutamate
e. none are true correct answers b. α-ketoacid; glutamate
Herbicides (e.g., "Roundup") that inhibit biosynthesis of "essential" amino acids are supposedly
safe for animal exposure because animals do not have enzymes for:
a. synthesis of the members of the 3-phosphoglycerate family
b. the glyoxylate cycle.
c. the glutamine synthesis pathway.
d. Phe, Val, Leu, and Ile biosynthetic pathways.
e. none are correct. correct answers d. Phe, Val, Leu, and Ile biosynthetic pathways.
The term ketogenic amino acids refers to amino acids:
a. that are precursors for glucose synthesis.
b. degraded to yield acetyl CoA or acetoacetate.
c. that can not be converted to fatty acids or ketone bodies.
d. degraded to yield succinyl-CoA, pyruvate, α-ketoglutarate, fumarate and oxaloacetate.
e. none of the above correct answers b. degraded to yield acetyl CoA or acetoacetate.
All are characteristics of Maple Syrup Urine Disease EXCEPT:
What is nitrogen fixation?
a. The reduction of NO3− to NH4+.
b. The formation of NH4+ from N2 gas.
c. The oxidation of NH4+ to N2.
d. The oxidation of NH4+ to NO3−.
e. The formation of NO2− from NO3−. correct answers b. The formation of NH4+ from N2 gas.
The involvement of ATP in the nitrogenase complex is because ATP is needed to:
a. provide electrons.
b. phosphorylate the enzyme.
c. break the N2 triple bond.
d. transfer electrons from ferredoxin.
e. all are true. correct answers c. break the N2 triple bond.
In plants and microorganisms, amino acid biosynthesis is a matter of synthesizing the appropriate
____ followed by transamination with ____.
a. acetyl-CoA derivatives; glutamine
b. α-ketoacid; glutamate
c. phospho-carbon skeleton; alanine
d. nitrogenous base; glutamate
e. none are true correct answers b. α-ketoacid; glutamate
Herbicides (e.g., "Roundup") that inhibit biosynthesis of "essential" amino acids are supposedly
safe for animal exposure because animals do not have enzymes for:
a. synthesis of the members of the 3-phosphoglycerate family
b. the glyoxylate cycle.
c. the glutamine synthesis pathway.
d. Phe, Val, Leu, and Ile biosynthetic pathways.
e. none are correct. correct answers d. Phe, Val, Leu, and Ile biosynthetic pathways.
The term ketogenic amino acids refers to amino acids:
a. that are precursors for glucose synthesis.
b. degraded to yield acetyl CoA or acetoacetate.
c. that can not be converted to fatty acids or ketone bodies.
d. degraded to yield succinyl-CoA, pyruvate, α-ketoglutarate, fumarate and oxaloacetate.
e. none of the above correct answers b. degraded to yield acetyl CoA or acetoacetate.
All are characteristics of Maple Syrup Urine Disease EXCEPT:
