In the accompanying figure, the purpose of electrical shock at the stage of the process labeled as A is to:
a. kill the egg cell nucleus.
b. initiate fusion of the two cells.
c. stimulate cell division.
d. induce mutations.
e. initiate apoptosis.
b
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Why are young leaves that are still in the bud considered "sinks" for phloem transport?
A. They produce carbohydrates through photosynthesis. B. They do not undergo photosynthesis. C. They do not have developed sieve tubes. D. The sucrose concentration is too high.
It has been estimated that if everyone in the world had the same lifestyle as the average American, it would require ____ more Earths
a. one b. two c. three d. four e. five
Scientists use mitochondrial DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, mitochondrial DNA samples taken from ____ would have the most unique mutations, representing the original and oldest DNA sequences.
A. Africa B. Asia C. Australia D. Europe E. the Americas
The original source of all genetic variation is _____.
A) mutation B) meiosis C) a need for new traits D) natural selection E) recombination