What is nitrogen fixation?
A. the conversion of nitrate (NO3-) into nucleic acids
B. the incorporation of ammonia (NH3) into amino acids
C. the release of ammonia (NH4-) from decomposing organic material
D. the conversion of atmospheric nitrogen (N2) into ammonia (NH3)
E. the conversion of ammonia (NH3) into ammonium ion (NH4+)
Answer: D
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Why are the male gonads held outside the body cavity?
A. Normal body temperature is too high for spermatogenesis. B. Normal body pH is too low for spermatogenesis. C. Gonadotropins are inactivated at normal body temperature. D. Sperm development proceeds much slower at normal body temperature. E. Leydig cells will die at normal body temperature.
What would result if a cell underwent mitosis but did not complete cytokinesis?
A) one cell with one nucleus containing twice the normal number of chromosomes B) one cell with two nuclei C) two daughter cells with no nucleus D) two daughter cells with too few chromosomes
The most common method of bacterial reproduction is
A) prokaryotic fission. B) meiosis. C) mutation. D) budding.
Genes that encourage inappropriate division of cells?
a. tumor suppressor genes b. negative growth regulators c. P53 d. oncogenes e. proto-oncogenes