In the development of an oocyte, meiosis is
halted twice. What are those two phases of
meiosis?
a. prophaseI and metaphase I
b. prophaseII and metaphaseII
c. metaphase I and prophase II
d. prophase I and metaphase II
e. prophase I and anaphase II
D
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The lumen of a transverse tubule is occupied by
A. extracellular fluid. B. cytoplasm. C. actin. D. myosin. E. sarcomeres.
Which of the following structures is NOT actively involved with saltatory conduction?
a. oligodendrocytes b. myelin c. Na+/K+ pumps d. voltage-gated Na+ channels e. nodes of Ranvier
In biology lab, you are observing specimens of muscle cells and nerve cells, as examples of
A. germ cells. B. gametes. C. somatic cells. D. zygotes. E. haploid cells.
In various experiments that recreated conditions on the early Earth, molecules such as amino acids,
glucose and ribose were produced from a. clay. b. ether. c. formaldehyde. d. alcohols. e. ATP.