Asexual reproduction ____
a. is common in vertebrates
b. involves the fusion of two sperm
c. involves the fusion of two eggs
d. gives rise to offspring without the fusion of gametes
e. involves the fusion of a male gamete and a female gamete
ANSWER: d
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A woman visits her doctor's office complaining of pattern baldness. Her mother and father do not have pattern baldness, but her brother does. The doctor is concerned that she may have the serious condition of _______, and he immediately orders blood tests to check her ________ levels.
A. tumor of the adrenal gland, 5-dihydrotestosterone B. tumor of the reproductive system, testosterone C. skin cancer, 2,5 alpha-reductase D. tumor of the adrenal gland, estradiol E. tumor of the reproductive system, 5-dihydrotestosterone
The critical function of the sodium-potassium pump of neurons is to move
A. Na+ and K+ into the cell. B. Na+ and K+ out of the cell. C. Na+ into the cell and K+ out of the cell. D. Na+ out of the cell and K+ into the cell. E. Na+ and K+ into the cell and H+ out of the cell through an antiport mechanism.
Match the choice on the left with the correct choice on the right
A) end-product inhibition B) trypsin C) Lineweaver–Burk plot D) RNA E) zinc F) protein kinases G) distortion of substrate and enzyme 1) double-reciprocal 2) feedback inhibition 3) covalent modification 4) proteolytic cleavage 5) ribozymes 6) prosthetic group 7) induced-fit model
The process that decreases the number of organisms with phenotypes less fit to meet environmental
challenges is: a. natural selection. b. genetic drift. c. gene flow. d. genetic polymorphism. e. migration.