The trp operon is an example of a(n) ____ operon where tryptophan acts as a(n) ____

a. inducible; inducer
b. inducible; activator
c. repressible; corepressor
d. repressible; repressor
e. repressible; inducer


ANSWER: c

Biology & Microbiology

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Mitochondrial DNA is useful for tracing ancestry because:

A. recombination rarely occurs. B. mutations in mitochondrial DNA are rare; mitochondrial DNA has relatively little variation. C. mutations in mitochondrial DNA are almost always harmful. D. both recombination and mutation in mitochondrial DNA are rare. E. both recombination and mutation in mitochondrial DNA are rare, but when mutations do occur, they are almost always harmful.

Biology & Microbiology

Which of the following is always a part of

speciation?

a. behavioral isolation b. temporal isolation c. reproductive isolation d. ecological isolation e. mechanical isolation

Biology & Microbiology

Which blood type is the universal donor?

a. A b. B c. AB d. O e. none of these

Biology & Microbiology

Which event occurs in lung blood?

a. Plasma HCO3- enters erythrocytes. b. In erythrocytes, carbonic anhydrase converts CO2 and H2O into HCO3- and H+. c. Free H+ binds to hemoglobin. d. CO2 binds to hemoglobin.

Biology & Microbiology