What kinds of cancers might eventually be treated with RNAi, which you learned about in Chapter 18?
What will be an ideal response?
siRNAs can be engineered to silence or down-regulate genes by binding with their mRNA. A potential application may thus be treating cancers that stem from the expression or overexpression of a gene product; for example, overproduction of growth factors or protein kinases by an oncogene.
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As shown in Figure 25.1 (and reproduced here), atmospheric CO2 levels oscillate over the course of the year. What season would you expect oxygen levels to be highest?
A. summer B. fall C. winter D. spring
The source of glucocorticoids is the
a. pituitary gland. b. adrenal cortex. c. adrenal medulla. d. thymus gland. e. thyroid gland
Which extinct hominin first appeared about 1.9 million years ago and had a larger brain than Homo habilis, its immediate predecessor?
A) Homo ergaster B) Homo neanderthalensis C) Homo sapiens D) Australopithecus
Ted heats some food just to boiling, and stores some of it immediately in a container which he places in the refrigerator. A week later he takes the food out and finds it has spoiled. The microbes responsible are probably
A) thermoduric. B) thermophiles. C) mesophiles. D) hyperthermophiles. E) psychrophiles.