In a person with cystic fibrosis, the CFTR mutation causes the protein to be ____
a. embedded in the plasma membrane
b. destroyed in the endoplasmic reticulum
c. shuttled to the nuclear membrane instead of the plasma membrane
d. shuttled to the plasma membrane instead of the nuclear membrane
e. expelled from the cell by exocytosis before it can do its job
ANSWER: b
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It is believed that HIV has passed from chimps to humans more than once. This suggests that animal-to-human viral transmissions may be more common than previously thought
What is the best evidence in support of the conclusion that HIV made the chimp-to-human leap more than once? A) HIV has multiple strains, and the virus does not appear to be able to leap from humans back to chimps. B) HIV has appeared on multiple continents. C) Human-to-human transmission of HIV requires direct personal contact that simply could not have resulted in the widespread outbreak we see today. D) Several species are known to have similar viruses resulting in immunodeficiency diseases.
You have made a smear of a bacterial culture and have performed the Gram stain on it. Looking at the organism under the microscope, you notice that the cells do not seem to be the dark blue-purple of a gram-positive reaction, but instead are light purple. Your staining procedure was performed correctly. What is your best explanation as to why the bacteria have stained this way?
A. The specimen did not undergo heat fixation before staining; therefore, the primary dye does not stick properly to the wall. B. These are mutant bacteria which cannot be stained like other bacteria. C. The bacteria were taken from an inappropriate medium, and a chemical is interfering with proper staining of the cells. D. There is something in the wall of the bacteria that has affected the uptake of the crystal violet into the cell wall, thereby staining it improperly.
Which of the following is true about bile?
a. it is an enzyme that digests fat b. it is made in the gallbladder c. it is stored in the liver d. hard pellets of bile are called gallstones e. none of these is true about bile
The cortical reaction of sea urchin eggs functions directly in _____
A) the formation of a fertilization envelope B) the production of a fast block to polyspermy C) the release of hydrolytic enzymes from the sperm D) the generation of an electrical impulse by the egg