Which of the following uses labeled probes to visualize the expression of genes in whole tissues and organisms?
A) RT-PCR
B) in situ hybridization
C) DNA microarrays
D) RNA interference
B
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Meiosis I results directly in the production of
a. spermatids. b. spermatogonia. c. primary spermatocytes. d. secondary spermatocytes. e. sperm.
A population of T cells was stimulated to proliferate in response to a particular antigen. A sample of 1000 stimulated cells was analyzed by fluorescence-activated cell sorting (FACS) for total DNA content
Of the 1000 cells, 400 had a 2n amount of DNA, 200 had a 4n amount of DNA, and the remaining 400 cells had between a 2n and 4n amount of DNA. Additional immunofluorescence analysis revealed that 200 of the cells were in various stages of M phase and that M phase lasted 2 hours. What is the total length of the cell cycle? A) 8 hours B) 12 hours C) 18 hours D) 20 hours E) 24 hours
The subunit of a kidney that purifies blood and
restores solute and water balance is the a. glomerulus. b. loop of Henle. c. nephron. d. ureter. e. peritubular capillary.
When your physician takes your pulse, he or she is feeling the expansion and contraction of your
A) veins or venules. B) arteries and veins. C) capillaries. D) arteries or arterioles.