An enzyme’s specificity is based on ____
a. the shape of its active site
b. the amount of activation energy it requires
c. the number of amino acids in its structure
d. the nature of its cofactors
e. the conformation of the products
Answer: a
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Which of the following best explains this phenomenon?
There is a population of frogs living in a pond, 25 are green, 25 are brown, 25 are yellow with green spots and 25 are all yellow. A drought occurred and 75% of the frogs died. The remaining frogs were green and brown, after 25 generations the frogs still were green and brown, yellow frogs never appeared in the population again. A. Sexual selection. B. Balancing selection. C. Bottleneck effect. D. Heterozygote advantage. E. Founder effect.
The most diverse of the four eukaryotic kingdoms is the
A. Protista Kingdom. B. Bacteria Kingdom. C. Plantae Kingdom. D. Animalia Kingdom.
The operation of natural selection depends
upon the fact that a. the strong always survive, whereas the weak always die. b. some individuals have a better chance to produce more offspring. c. mutations are always harmful. d. acquired characteristics are inherited. e. reproduction of all members of a species is virtually the same.
Hemoglobin is one of the major buffer systems in the body.
a. true b. false