Why don't all changes in DNA result in mutations?
a. Mutations are never expressed
b. None of these choices.
c. The cell never makes a mistake during transcription.
d. The cell never makes a mistake during translation.
e. The same amino acid can be produced by a variety of codons.
e
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The major disadvantage of using stem cells derived from human embryos was:
a. they did not differentiate. b. they were difficult to maintain in culture. c. they did not function in humans other than those that they were obtained from. d. they could not be frozen. e. they did not contain fully active telomerase.
In studies designed to determine the origin of HIV, how did the researchers first know that Marilyn the chimp may be infected with HIV?
A. She had been used in HIV research. B. She had tested positive for antibodies against HIV. C. She had HIV DNA in her tissues. D. She had symptoms of HIV infection, or AIDS. E. She had HIV RNA in her blood.
A round-trip movement of an individual from one place to another and back again is called ________
Fill in the blank(s) with correct word
The complete collection of an organism's genetic information constitutes:
A) a chromosome. B) a genome. C) proteins. D) a gene.