In some ciliate protozoa, the codons UAA and UAG encode glutamate, rather than acting as stop codons. How does this compare to other species?
A. This is not unusual-while most species have a similar genetic code, there are often variations for some of the amino acids.
B. This is unusual-almost all species share the same universal genetic code.
C. This is typical-every species has its own unique genetic code.
Answer: B
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The power stroke corresponds to which event in muscle contraction?
A. cross-bridge formation. B. sliding of actin with respect to myosin C. cocking of the myosin head D. binding of the myosin head to actin
Media used for coliform enumeration include chemicals that change color depending on the enzymes present in the microbes, thereby allowing a count of total bacteria and total coliforms from a single plate. This type of medium is termed ________.
A. defined B. selective C. complex D. differential
Which of the following includes the most likely change in the coloration of the beetle population after pollution and a correct rationale for the change?
(A) The coloration range shifted toward more light-colored beetles, as in diagram I. The pollution helped the predators find the darkened tree trunks. (B) The coloration in the population split into two extremes, as in diagram II. Both the lighter-colored and the darker-colored beetles were able to hide on the darker tree trunks. (C) The coloration range became narrower, as in diagram III. The predators selected beetles at the color extremes. (D) The coloration in the population shifted toward more darker- colored beetles, as in diagram IV. The lighter-colored beetles were found more easily by the predators than were the darker- colored beetles.
Artificial selection and hybridization can demonstrate the ________ basis of behavior.
A. operant B. endogenous C. cognitive D. genetic E. associational