How does the K–T mass extinction impact our perception of gradualism, the predominant view of geological change since the days of Charles Lyell?
a. It disproves that Earth changes only gradually.
b. Geological changes always happen rapidly.
c. Long periods of gradual change can be disrupted by catastrophes.
d. The speed of geological change cannot be quantified.
e. A and C.
E
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The mediator protein complex in eukaryotes
A. facilitates interactions between RNA polymerase II and regulatory transcription factors. B. controls the rate at which RNA polymerase translates mRNA. C. completely enfolds RNA polymerase and the general transcription factors. D. is composed of a single protein.
Uracil will pair with
a. ribose. b. adenine. c. cytosine. d. thymine. e. guanine
In the leaky-barrel model, the weight of the barrel on the hose is analogous to the strength of the:
(a) settling point (b) satiety signal (c) need to defecate (d) hunger signal
Which of the following is incorrect about termination codons?
A. Termination codons include UAA, UAG, UGA. B. Termination codons do not have corresponding tRNA. C. They are also called nonsense codons. D. Termination codons include AUG. E. They occur where the bond between the final tRNA and the growing polypeptide is broken.