Bioengineered hamster ovaries produce blood-clotting factor VIII for human use. This method is better
than obtaining the factor from human blood because
a. it is cheaper.
b. it is more natural.
c. there is no risk of transmitting blood-borne diseases.
d. larger quantities are produced.
e. it is faster.
C
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Cyclic 2,3-diphosphoglycerate (cDPG) is present in molar quantities in the cytoplasm of many hyperthermophilic methanogens. The function of this compound is to
A) prevent rRNA misfolding. B) prevent chemical damage to DNA at high temperatures. C) counteract the effects of high osmotic environments. D) activate hydrogen gas.
The organisms that convert carbon dioxide into organic matter are the
A. secondary consumers. B. primary consumers. C. producers. D. decomposers.
A situation in which the birth rate equals the death rate is called
a. an intrinsic limiting factor. b. exponential growth. c. saturation. d. zero population growth. e. geometric growth.
Because they are made up of similar bones, the flippers of whales and the wings of birds are examples of...
a) vestigial organs b) embryos c) homologous structures d) fossil structures