Enzymes that cleave DNA at specific sites are called ________. Cutting by some of these enzymes results in single-stranded, complementary tails called ________.
A. endonucleases; sticky
B. peptidases; lagging
C. vectors; blunt
D. DNases; leading
Answer: A
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In female mammals, oogenesis
A. occurs in the uterus. B. requires the production of primary oocytes at puberty. C. is cyclical. D. requires progesterone. E. is a continuous process throughout adulthood.
If your mother and father both have cystic fibrosis, which is caused by a recessive allele, the odds of you having cystic
fibrosis are ____.
a. 1/4 b. 1/2 c. 3/4 d. 1 e. 0
When you are upright, what is the primary mechanism that propels blood in your feet back to your inferior vena cava?
A. recoil of elastic fibers in the walls of the leg veins B. contraction of the left ventricle of the heart C. contraction of smooth muscle in the walls of the leg veins D. contraction of skeletal muscles in your legs E. the valves in the leg veins alternating between open and closed
The kidney gets rid of toxic compounds.
a. true b. false