Which event accounts for 20% of the greenhouse gases recorded annually?
a. deforestation of dry tropical forests
b. deforestation of moist tropical forests
c. burning of fossil fuels
d. burning of coal
e. urbanization
ANSWER: b
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An individual has been infected with a particular retrovirus. In order for the latent virus DNA to be inherited by subsequent generations stemming from this individual, it must be found
A) in germ line cells. B) in stem cells. C) at a point early in childhood. D) in all cells simultaneously. E) in somatic cells.
What is the name of the process by which carbon sediments on the ocean floor are moved beneath one tectonic plate, and may eventually be released by volcanic activity?
a. sublimation b. infusion c. subduction d. lithification
If a child more strongly resembles one parent's physical traits than the other parent's, the explanation could be due to chromosome movements during
A) prophase II. B) anaphase II. C) metaphase II. D) telophase I. E) anaphase I.
The Ras protein is a GTPase that functions in many growth-factor signaling pathways
In its active form, with GTP bound, it transmits a downstream signal that leads to cell proliferation; in its inactive form, with GDP bound, the signal is not transmitted. Mutations in the gene for Ras are found in many cancers. Of the choices below, which alteration of Ras activity is most likely to contribute to the uncontrolled growth of cancer cells? (a) a change that prevents Ras from being made (b) a change that increases the affinity of Ras for GDP (c) a change that decreases the affinity of Ras for GTP (d) a change that decreases the rate of hydrolysis of GTP by Ras