There is about as much nuclear DNA in a primary spermatocyte as in ________ (how many) spermatids?
Fill in the blank(s) with correct word
4
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Which one of the following incorrectly matches a molluscan structure with its typical function?
A. ctenidia—secretion of the shell (when present) B. visceral mass—houses organs of digestion, excretion, reproduction C. foot—locomotion D. nephrostome—collection of nitrogenous wastes E. radula—feeding organ
Uniform distribution of human habitat would
likely be the result of ____, whereas habitats of other animals would be due to ____.
a. competition; social interaction b. community planning; competition c. social interaction; chemical avoidance d. limited mobility; contact inhibition e. random chance; planning
Atoms or clusters of atoms that are covalently bonded to carbon and influence the behavior of organic
compounds are known as a. functional groups. b. ions. c. acids. d. network solids. e. anhydrides.
Which hormone affects the greatest variety of cell types?
A) parathyroid hormone B) melatonin C) growth hormone D) calcitonin