The presently accepted model of enzyme action was proposed by Daniel Koshland in the 1960s and suggested that the enzyme was a flexible structure with an active site roughly complementary to the substrate that binds it. After its initial interaction with the substrate, the enzyme alters its shape and thus improves the fit of the substrate in the active site. What is the name of this model?
a) the flexible sponge model
b) the lock and key model
c) the koshland model
d) the induced fit model
e) the flexible fit model
Ans: d) the induced fit model
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DNA methylation of a gene during spermatogenesis would be most likely to result in
A. the inactivation of the paternal allele in the offspring. B. dosage compensation by the paternal allele. C. the inactivation of the maternal allele in the offspring. D. the inactivation of the X chromosome. E. dosage compensation by the maternal allele.
What might be an unforeseen outcome of planting soybean plants at high densities in a field?
A) reduced seed production per plant B) increased plant size C) increased seed size D) decreased plant mortality
Fever is beneficial during viral infection because the higher temperature
A) inactivates interferons. B) increases vasodilation, contributing to inflammation. C) increases sweating and consequently the barrier effect. D) prevents viral infection of fibroblasts. E) increases the effectiveness of interferons.
Which is incorrect about shigellosis?
A. outbreaks have occurred in day care centers B. it is watery diarrhea with bloody, mucoid stools, and abdominal cramps C. it frequently involves septicemia D. human carriers cause fecal transmission E. it is also called bacillary dysentery