Which of the following terms best characterizes catabolite repression associated with the lac operon in E. coli?
A) negative control
B) constitutive
C) repressible system
D) positive control
E) inducible system
D
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Rock pocket mice of the Sonoran desert
a. are nocturnal feeders. b. live in both tawny-colored granite outcroppings and dark basalt from old lava flows. c. are camouflaged from predators by their fur color. d. that are dark-colored have a DNA sequence coding for fur color that differs from that of their tawny relatives. e. fit all of these descriptions.
During apoptosis
a. digestive enzymes are unleashed. b. proteases break down structural proteins. c. nucleases break down nucleic acids. d. the nucleus breaks apart. e. all of these occur.
How many unique mRNA codons can be constructed from the four different RNA nucleotides?
A. four
B. 12
C. 16
D. 61
E. 64
The convergence of evolutionary biology with genetics produced the unified evolutionary theory known as:
A) the origin of species. B) common descent with modification. C) the modern synthesis. D) polygenic inheritance.