The skulls of infant chimpanzees and infant humans are remarkably similar in shape. However, as they mature, they
become quite different due to differences in ____.
a. allometric growth
b. paedomorphosis
c. gradualism
d. vicariance
e. heterochrony
ANSWER: a
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The standard state of dilute aqueous solutions is at a temperature of ________°C (298 K), ________ atmosphere(s) of pressure, and with products and reactants present in concentration of ________ mol/L.
Fill in the blank(s) with the appropriate word(s).
A strain of penicillin-resistant N. gonorrhoeae that does not have a plasmid is isolated. A lysate made from the bacterium cannot degrade penicillin in an in vitro assay. When a culture of this strain is grown in a solution that contains radioactive penicillin, the amount of penicillin found within cells is less than the amount found within cells from a nonresistant strain. The DNA sequence of the porin gene from the resistant strain does not have any mutations. What is the most likely mechanism of resistance in this strain?
A) A mutation in the mtr gene has occurred, resulting in fewer efflux pumps. B) A penA nonsense mutation has occurred. C) A penA missense mutation has occurred. D) The bacterial genome carries the penr gene.
A protein that speeds up chemical reactions without being consumed in the process is called a(n) ________
Fill in the blank(s) with correct word
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