The individual credited for coining the term cancer is
A) Paget.
B) Hippocrates.
C) Folkman.
D) Rous.
E) Aristotle.
B) Hippocrates.
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Enzymes that are only produced when substrate is present are termed
A. constitutive enzymes. B. induced enzymes. C. conjugated enzymes. D. exoenzymes. E. endoenzymes.
Gap junctions in cells
a. prevent fluid leakage between adjacent cells. b. are used only to stimulate cellular reproduction. c. allow ions to pass between adjacent cells. d. only occur in muscle tissue. e. do none of these.
A horse has a diploid number (2n) of 64 and a donkey has 2n = 62. The hybrid of these two species, mules, have 2n = 63 and are sterile. Why are mules sterile?
A) Mules cannot physically mate with each other. B) Horses are not able to form new species. C) Mules are not true hybrids. D) One chromosome is unpaired and fails to divide properly during meiosis. E) Mules cannot physically mate with horses and donkeys.
The poly-A tail is thought to facilitate the export of mRNA from the nucleus
__________________ Indicate whether the statement is true or false.