Thymidine dimers cannot be repaired in humans by which of the following?
A. nucleotide excision repair (NER)
B. transcription-coupled repair (TCR)
C. translesion synthesis (TLS) using Pol ?
D. photoreactivation
E. All of the choices given can be used to repair thymidine dimers in human cells.
D
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Actinorrhizae can benefit the plant by providing it with the products of ________.
A. denitrification B. nitrogen fixation C. nitrification D. sulfate reduction
In order to completely oxidize glucose, it takes two turns of the citric acid cycle, which yields a net of 2 ATP, 6
NADH and 2 FADH2. How many of the 32 total ATP molecules produced in cellular respiration come from the citric acid cycle, including the contribution from the NADH and FADH2?
a. 32 b. 28 c. 24 d. 20 e. 16
The trp operon in E. coli is regulated in such a manner as to allow expression of the genes only when cellular levels of tryptophan are low
When tryptophan levels are adequate, the secondary structure of the mRNA halts translation. This form of regulation is known as A) attenuation. B) transcriptional regulation. C) positive regulatory control. D) allosteric inhibition. E) induction.
Organisms that consume producers are ________
A) detritivores B) decomposers C) primary consumers D) producers