Which situation would be most likely to form a fossil under normal environmental conditions?
A. An elephant that died at the edge of a waterhole.
B. A bird that died and fell to the forest floor.
C. A slug that died in leaf litter.
D. A jellyfish that died in an estuary.
A. An elephant that died at the edge of a waterhole.
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The condition shown in the photograph, xeroderma pigmentosum, is caused by dimerization of thymine bases when UV damage to DNA is not repaired. What mechanism exists to repair this kind of damage to DNA?
a. proofreading
b. nucleotide mismatch repair
c. nucleotide excision repair
d. phosphodiester substitution
The process of oogenesis is completed at ________
Fill in the blank(s) with correct word
Which of the following U.S. agencies oversees phase testing of drugs prior to their approval for clinical uses?
A) USDA B) EPA C) FDA D) NIH E) NSF
Plants possess many compounds that affect animals. What explains these plant characteristics?
A) Plants have been subject to mutation-causing pollution for many decades. B) Plants have cell structures that are very different from animal cells. C) Plants contain chloroplasts that are derived from free-living prokaryotes. D) Plants that produced chemical defenses were successful against plant-eating animals.