Select the FALSE statements regarding ammonium metabolism.
a. Carbamoyl-phosphate synthetase I catalyzes one of the steps in the urea cycle.
b. Glutamate dehydrogenase catalyzes the reductive amination of -ketoglutarate to yield glutamate, utilizing NADH
Ch 10 owl 1-16
Which of the following statements are true about RNA and DNA?
a. RNA contains ribose and thymine, DNA contains 2'-deoxyribose and uracil
b. RNA often contains modified bases, DNA rarely contains modified bases
c. RNA is usually single stran
The pKa values for the N-H groups of guanine are: N-1, pKa = 9.4; N-3, pKa = 4.0; N-7, pKa = 2.4. At pH = 7:
N-1 is protonated, N-3 and N-7 are deprotonated
N-1 is deprotonated, N-3 and N-7 are protonated
all three N atoms are protonated
N-1 and N-3 are p
Regulation of nitrogen fixation involves:
phosphorylation of nitrogenase reductase
ADP inhibition through dissociation of oxidized nitrogenase reductase from nitrogenase
adenylylation of nitrogenase
transcriptional activation of the nif genes by ammonia
In a melting profile of native dsDNA the absorbance at 260 nm increases. What is the physical basis for this change?
the DNA fiber shrinks as the temperature increases because of a B to A-DNA conformational change and
this increases the base stacking inte
Which of the enzymes listed below are present in the Calvin cycle and in glycolysis?
d. phosphoglycerate kinase
b, c, d
a, b, c, d
When a quantum of light energy is absorbed by a photosynthetic pigmen
Ch 25 OWL
In the synthesis of amino acids by living organisms:
a. an -amino group is transferred from an amino acid to the -keto position of an -keto acid.
b. the amino donor becomes an -keto acid, while the -keto acid acceptor becomes an -amino acid.
The first reaction in the pathway of serine biosynthesis is:
transfer of the side-chain to
hydrolysis of a phosphate ester
In the degradation pathway for phenylalanine and tyrosine as well as in the u