Raising viruses for numerous generations can produce an (adjuvant/attenuated/inactivated) form of the virus
What will be an ideal response?
attenuated
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Which of the following best describes the characteristics of the descending arm of the loop of Henle? (Select all correct choices.)
A. It is permeable to water. B. It actively transports electrolytes. C. It is impermeable to water. D. Its filtrate is mainly urea. E. Its filtrate becomes more and more concentrated.
Gregor Mendel's pioneering genetic experiments with pea plants occurred before the discovery of the structure and function of chromosomes. Which of the following observations about inheritance in pea plants could be explained only after the discovery that genes may be linked on a chromosome?
(A) Pea color and pea shape display independent inheritance patterns. (B) Offspring of a given cross show all possible combinations of traits in equal proportions. (C) Most offspring of a given cross have a combination of traits that is identical to that of either one parent or the other. (D) Recessive phenotypes can skip a generation, showing up only in the parental and F2 generations.
The usual, naturally-occurring mechanism that prevents development of cancer is the action of ____
a. cytotoxic T cells b. oncogenes c. radiation d. chemotherapy e. carcinogens
How does a prokaryotic cell differ from a eukaryotic cell?
a. A prokaryotic cell has no membrane-enclosed organelles. b. A prokaryotic cell has a plasma membrane. c. A prokaryotic cell contains organelles. d. A prokaryotic cell has a nucleus. e. A prokaryotic cell has DNA