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

Biology & Microbiology

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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

Biology & Microbiology

The process of programmed cell death is

a. exocytosis. b. apoptosis. c. system acquired resistance. d. metastasis. e. unknown.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology