Circulatory systems compensate for _____
A) temperature differences between the lungs and the active tissue
B) the slow rate at which diffusion occurs over large distances
C) the problem of communication systems involving only the nervous system
D) the need to cushion animals from trauma
E) the need that fetal organisms have for maintaining an optimal body temperature
Answer: B
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Exotoxins ______.
A. cause more damage than endotoxins B. are secreted by pathogenic organisms C. are bound to the cell wall of pathogenic organisms D. are host specific E. are bound to the membrane of pathogenic organisms
Molecules of mRNA are translated from 3' to 5', which is the opposite direction from which they were made
Indicate whether the statement is true or false
Which general genetic process is believed to account for the variety of cellular structures and functions in eukaryotic cells?
A) negative control exclusively B) variable gene activity C) intron processing D) RNA processing E) maternal environmental activities
You have been hired to create a cat that will not cause allergic reactions in cat-lovers
Your coworkers have cloned the gene encoding a protein found in cat saliva, expressed the protein in bacteria, and shown that it causes violent allergic reactions in people. But you soon realize that even if you succeed in making a knockout cat lacking this gene, anyone who buys one will easily be able to make more hypoallergenic cats just by breeding them. Which of the following will ensure that people will always have to buy their hypoallergenic cats from you? (a) Inject the modified embryonic stem (ES) cells into embryos that have a genetic defect to prevent the mature adult from reproducing. (b) Implant the injected embryos into a female cat that is sterile as a result of a genetic defect. (c) Sell only the offspring from the first litter of the female cat implanted with the injected embryos. (d) Surgically remove the sexual organs of all the knockouts before you sell them.