Mutations are the original source of new alleles, but
many are __________ or __________. Fill in the blank(s) with the appropriate word(s).
Answer: lethal or neutral
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What percent of Earth is dry land?
a. 10 percent b. 25 percent c. 30 percent d. 45 percent e. 50 percent
According to the base pairing rules of DNA, if the sequence of bases on one strand was AGGCTTA, what would be the sequence of bases on the complementary strand?
A) AGGCTTA B) ATTCGGA C) CGGATTC D) TCCGAAT
Increased heart rate associated with running is an example of a ____________ process.
A. metabolic B. generative C. responsive D. control
The oldest fossils are those of tiny bacteria, which are classified as prokaryotes. Why are these organisms classified as prokaryotes?
A) They are single-celled organisms that lack internal membrane-bound compartments. B) They consist of cells that lack any genetic information. C) They are the first organisms that appeared on Earth. D) They are single-celled organisms that no longer exist on Earth.