Which kind of enzyme prevents DNA from tangling up by introducing negative supercoils as the replication fork migrates during replication?
A) Helicase
B) Ligase
C) DNA polymerase I
D) DNA polymerase III
E) Topoisomerase
E
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The most severe mass extinction on Earth occurred at the end of the ____ period
a. Cambrian b. Carboniferous c. Jurassic d. Permian e. Devonian
Albinism, lack of pigmentation in humans, results from an autosomal recessive gene (a). Two parents with normal pigmentation have an albino child. What is the probability that their next child will be an albino girl?
What will be an ideal response?
Pain over the suprapubic region is MOST suggestive of injury to the:
A) urethra. B) ureters. C) bladder. D) iliac arteries.
One sarcomere
A. extends from Z line to Z line. B. is composed of many muscle fibers. C. is composed of many myofibrils. D. contains only actin fibers. E. surrounds each muscle in the body.