Why is transcription-coupled repair (TCR) considered particularly efficient when compared to nucleotide excision repair (NER)?
A. The exinuclease employed in TCR removes a smaller fragment containing the damage.
B. TCR targets transcriptionally active regions for repair over damage in less active parts of the genome.
C. It uses error-prone polymerases so it can move through damaged areas faster.
D. It directly repairs the damage rather than removing and replacing the damaged strand.
E. TCR requires less protein interactions.
B
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A. a change in membrane potential. B. reaction of a receptor protein with a stimulus. C. alteration of the conformation of a channel protein. D. All of the answer options are correct.
A human’s body is approximately _____ percent water
a. 10 b. 50 c. 65 d. 90
If you eliminated all sources of calcium (dairy
products, some vegetables) from your diet, the level of which of the following would rise in an attempt to supply calcium stored in your body to the tissues that need it?
a. aldosterone b. calcitonin c. mineralocorticoids d. parathyroid hormone e. GH
At the base of the food web in aquatic ecosystem are:a
algae. b. Euglena. c. plankton. d. plants. e. fish.