Think back to the several examples your text presents of the ideas of spontaneous generation that persisted for thousands of years. Why do you think this idea was so appealing for so long?
Even after the experiments of Francesco Redi, why did the new technology of microscopy help the theory to maintain credibility until Darwin's time?
What will be an ideal response?
ANS:
Answers will vary, but should include the difficulty in observing a clear parental source.
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Sponges are atypical animals because they
(a) reproduce sexually. (b) are heterotrophic. (c) lack definite tissues. (d) are multicellular.
The nucleosome is a complex of eight histone subunits wrapped by a short DNA strand approximately 10 base pairs long
A. true B. false
The experiments that clearly distinguished DNA and not protein as the hereditary material were conducted by _____.
A. Pauling B. Hershey and Chase C. Griffith D. Watson and Crick E. Avery
Enzymes that are always present, regardless of the amount of substrate are
A. constitutive enzymes. B. apoenzymes. C. endoenzymes. D. axoenzymes. E. regulated enzymes.