A limitation of retrovirus-mediated gene transfer is that ________
A) retroviruses cannot be used to make transgenic animals
B) retroviruses only work with Ti vectors
C) retroviruses only integrate DNA at specific sites
D) retroviruses integrate DNA randomly in the genome
E) retroviruses can only be used to make transgenic plants
D
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As recently as the 1980s, the medical establishment believed ulcers to be caused by stress and an increase in gastric acidity. How has the current understanding of ulcer development changed patient treatment?
A. There is no treatment for ulcers, then or now. B. Antibiotics are now used to treat ulcers. C. Different foods are now suggested for patients having ulcers. D. Doctors now give their patients sedatives to calm patients with ulcers.
In the Ames test for mutagenicity,
A) reverse mutations convert auxotrophs to prototrophs that survive. B) colonies are due to forward mutations that convert prototrophs to auxotrophs. C) cells are treated with mutagen and only cells with no mutations survive. D) cells are treated with excess amino acids and cells with mutations are killed. E) rat liver enzymes are present to protect cells from mutation.
Lymph nodes filter the blood and remove bacteria and other invading microorganisms that may have entered the bloodstream
Indicate whether the statement is true or false
If a certain water-soluble, intravenous antibiotic is not succeeding in defeating the germs inside the central nervous system, the ________ may be preventing the antibiotic from reaching the brain
Fill in the blank(s) with correct word