Polio is transmitted by ingestion of water contaminated with feces containing polio virus. What portal of entry does polio virus use?
A) skin only
B) parenteral only
C) mucous membranes only
D) skin and parenteral
E) skin, parenteral, and mucous membranes
C
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Gehring tested the hypothesis that the Pax6 gene acts as a master regulator of eye development by introducing mouse Pax6 genes into Drosophila antennae. What happened, and did it support or refute his hypothesis?
A. A compound eye developed on the antenna; this supports the hypothesis B. A compound eye developed on the head; this supports the hypothesis. C. The antenna developed normally; this falsified the hypothesis. D. The antenna developed where the eye normally would be; this supports the hypothesis. E. The antenna developed where the eye would normally be; this falsified the hypothesis.
The anticancer drug taxol acts to
a. block microtubule organizing centers. b. stabilize microtubules and thus inhibit disassembly. c. block microtubule assembly by binding to free tubulin. d. accelerate microtubule disassembly by binding to tubulin in microtubules, causing those molecules to exit the microtubule more quickly. e. Both a and c
In order to understand how chromosomes move during anaphase of mitosis, researchers tagged ____ with a
fluorescent label before photobleaching the cell and examining chromosomal movement under a microscope.
a. DNA b. kinetochore microtubules c. nonkinetochore microtubules d. histones e. motor proteins
Which of the following has the largest surface-to-volume ratio?
a. Escherichia coli b. influenza virus c. Roseobacter denitrificans d. Staphylococcus aureus