During DNA replication, all of the following proteins are important for separating the DNA strands and allowing movement of the replication fork EXCEPT
A. helicase.
B. both helicase and topoisomerase.
C. DNA polymerase.
D. topoisomerase.
E. single-stranded binding proteins.
Answer: C
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The unifying theme in biology is
a. ecology b. genetics c. metabolism d. evolution e. taxonomy
At what stage of meiosis does crossing over occur?
A. metaphase I B. metaphase II C. prophase I (Meiosis I) D. prophase II
Choose the TRUE statement(s) about neural control of breathing. (Select all that apply.)
a. The breathing rhythm is generated by neurons in the hypothalamus. b. Breathing rate is modified by peripheral receptors that sense levels of oxygen in the carotid artery. c. An elevation in blood PCO2 will increase breathing rate. d. An elevation in blood pH will increase breathing rate.
Which step in this process requires use of restriction enzymes?
A) step A
B) step B
C) step C
D) step D