Which of the following statements about gametogenesis is correct (select all correct choices)?
A. In human males, spermatogenesis begins
at puberty.
B. In human females, primary oocytes form
during puberty.
C. In human females, the egg that is released
during ovulation is a primary oocyte.
D. In human females, a secondary oocyte
arrests in metaphase II.
E. In human males, spermatogenesis results
in one full-sized sperm and three polar
bodies.
A,D
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Which statement about plasma membranes is false?
a. Plasma membranes regulate the passage of materials. b. Plasma membranes divide the cell into compartments. c. Plasma membranes serve as surfaces for chemical reactions. d. Plasma membranes prevent communication with other cells. e. Plasma membranes transmit signals between the environment and the interior of the cell.
Of the four chambers of the human heart, which has the thickest walls, and why?
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