Which of the following causes of behavior is classified as an ultimate cause?
a. genetic
b. cellular
c. physiological
d. anatomical
e. adaptive
E
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The maximum number of bonds that can be formed by an atom:
A. is dependent on the valence of that atom. B. is dependent on the number of unpaired electrons in its outer shell. C. can be made up of a combination of single and double bonds. D. is atom specific; for example, carbon can form four bonds, whereas oxygen forms two. E. All of these choices are correct.
In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with virus. This activity can be attributed to
A) the presence of transposons integrating into polymerase genes. B) the presence of viroids. C) the presence of retrotransposons. D) infection with small bacteria known as mycoplasmas. E) a novel prion infection.
Which of the following is NOT true regarding
apoptosis? a. It is programmed cell death. b. It sculpts body parts. c. It primarily eliminates old, diseased cells. d. It involves cell self-destruction. e. The formation of the human hand is an example
An organism has been found to contain a defective form of photolyase. What function might be impaired in this organism?
A. Recognition of damaged DNA by the UvrABC complex B. Repair of DNA damage caused by UV light C. Stabilization of single-stranded DNA during DNA replication D. Lengthening of the tips of chromosomes