Over a lifetime about how many primary oocytes move through the ovarian cycle?
a. 300
b. 1000
c. 20,000
d. 200,000
e. 2,000,000
ANSWER: a
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Which organism has the largest number of protein-coding genes?
a. E. coli (bacteria) b. Saccharomyces cerevisiae (yeast) c. Homo sapiens (human) d. Oryza sativa (rice) e. Drosophila melanogaster (fruit fly)
A cell is in metaphase if:
a. the chromosomes are visible as threadlike structures. b. the nuclear envelope is clearly visible. c. the chromosomes are aligned at the midplane of the cell. d. the chromosome are separated into distinct groups at opposite poles of the cell. e. cytokinesis is occurring.
White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at a sample of blood for WBCs, what could you do to reduce interference from RBCs?
A) Mix the blood in a salty solution to cause the RBCs to lyse.
B) Mix the blood in an isotonic solution and allow the WBCs to float to the top.
C) Mix the blood in a hypotonic solution, which will cause the RBCs to lyse.
D) Mix the blood in a hypertonic solution, which will cause the RBCs to lyse.
What would happen to people exposed to a chemical warfare agent that blocked acetylcholine from binding to muscle receptors?
A) Action potentials would be continuously generated, causing convulsive muscle contractions. B) Muscle contractions would be prevented, causing paralysis. C) Muscle contractions could still occur, but relaxation of the muscle would be impaired. D) Action potentials would be continuously generated, causing convulsive muscle contractions; muscle contractions would then be prevented, causing paralysis.