DNA runs in _________ directions called an __________.
Fill in the blank(s) with the appropriate word(s).
Answer: Opposite, Anti-parallel
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Hybrid organisms frequently die as embryos or at an early age, a phenomenon called hybrid breakdown
a. True b. False
In DNA, cytosine bonds to guanine. In RNA, cytosine bonds to
a. thymine. b. cytosine. c. uracil. d. guanine. e. adenine.
During an acrosome reaction, the acrosome:a
detaches, allowing the sperm to penetrate the egg. b. releases enzymes that digest the outer layer of the egg. c. secretes calcium ions, which cause the sperm to fuse with the egg. d. releases bindin, which causes the sperm to bind to the egg. e. secretes a chemical that attracts the egg to the sperm.
Gene flow
A) can spread certain alleles throughout a species. B) negates the influence of evolution on a population. C) isolates populations from one another. D) limits evolutionary fitness. E) prevents migration of individuals into other populations.