Which characteristic possessed by Archaeopteryx was least likely present in their dinosaurian ancestors?
a. teeth
b. feathers
c. a long tail with many vertebrae
d. three clawed fingers on each hand
e. a forked breastbone
ANSWER: e
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14 homologous genes encoding globins (hemoglobin, myoglobin) in the human genome were originally derived from a single ancestor that duplicated 500-600 million years ago. Which term most adequately describes the relationship between these genes?
A. sister chromatids B. gene family C. gene cluster D. moderately repetitive sequences E. highly repetitive sequences
The process of programmed cell death is
a. exocytosis. b. apoptosis. c. system acquired resistance. d. metastasis. e. unknown.
If a given depolarizing event causes one action potential, which of the following might increase the likelihood of a second action potential being produced given the same stimulus as before
What will be an ideal response?z
Which of the following statements about necrosis is true?
a. It requires ATP. b. It does not cause inflammation. c. It may occur when cells are damaged by toxins. d. It produces nucleosome-sized pieces of chromatin. e. It results in fragmentation of the cell.