Sperm production in humans start
a. before birth.
b. shortly after birth.
c. at puberty.
d. during a man’s early twenties.
e. in late teenage-hood.
C
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Which of the following statements about water is false? a. Hydrogen bonds can form between water and other polar substances
b. The oxygen atom in a water molecule carries a slight negative charge. c. The hydrogen atoms in a water molecule carry a slight negative charge. d. The three-dimensional structure of ice owes its form to hydrogen bonding between water molecules.
When the Darwin/Wallace theory of natural selection is summarized, four central postulates emerge. Which of the following is NOT one of these four natural selection postulates?
A) Variations exist in any given generation of a species. B) Variations in traits are produced by mutations. C) Variations are, at least in part, heritable. D) Those individuals whose variations confer an advantage are more likely to survive and reproduce.
What kind of ecosystem are exotic species especially threatening to?
a) deserts b) marine ecosystems c) islands d) tropical forests
Some strains of Papillomavirus are oncogenic due to their ability to
A) lie dormant in cells for years. B) integrate into the host cell DNA. C) escape the phagosome before lysosome fusion. D) produce deoxyribonucleases. E) cause extensive damage to blood vessels.