Besides turning enzymes on or off, what other means does a cell use to control enzymatic activity?
A) localization of enzymes into specific organelles or membranes
B) exporting enzymes out of the cell
C) connecting enzymes into large aggregates
D) hydrophobic interactions
A
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Plants are more readily manipulated by genetic engineering than are animals because _____
A) plant genes do not contain introns B) more vectors are available for transferring recombinant DNA into plant cells C) a somatic plant cell can often give rise to a complete plant D) genes can be inserted into plant cells by microinjection E) plant cells have larger nuclei
What may be a result of the denaturation of proteins?
a. formation of hydrogen bonds b. loss of three-dimensional structure c. removal of R groups from amino acids d. no change in enzyme activity e. formation of covalent bonds
When a population has inhabited an area for a long time and the population size has stabilized, then
A) the environmental resistance declines. B) density-independent factors are involved. C) the carrying capacity of the area has been reached. D) predation decreases. E) density dependence is clearly not involved in the population growth.
Why are open coal mines (strip mines) more likely to result in acid mine drainage than are underground mines?
A. Archaea such as Ferroplasma acidarmanus that produce acid from ore only live aboveground. B. Rainwater can leach acids from strip mines but not from underground mines. C. Air exposure increases the oxidation rate of sulfur and iron by bacteria, and oxidized sulfur or iron can combine with rainwater to form a strong acid. D. Strip mines have more iron- and sulfur-containing minerals that may be oxidized by acid-producing bacteria.