Rett syndrome results from
A) a microRNA that binds the wrong set of mRNA targets.
B) unstable transposons.
C) fetal hemoglobin that is reactivated in a child.
D) abnormal methylation of a gene expressed in the brain.
B) unstable transposons.
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Which one of the following activities would least likely be found in a topoisomerase?
A. cutting a phosphodiester linkage B. inducing or relaxing twists in double- stranded DNA C. adding nucleotides to the end of a DNA strand D. reforming phosphodiester linkages E. Topoisomerases are equally likely to perform all of these functions.
In the anammox process ________.
A. nitrogen gas is evolved B. all reactions must take place in the absence of O2 C. anaerobic oxidation of ammonia is coupled to the reduction of nitrite D. All of the choices are correct.
What is the function of the cremaster muscle?
A. It is the path through which sperm leave the body. B. It opens the cervix during childbirth. C. It is responsible for clitoral erection. D. It moves the testes to or away from the body
How does the early development of the mouse differ from that of Caenorhabditis?
a. Embryonic mouse cells commit to their ultimate fate earlier than do the cells of Caenorhabditis. b. Early development of a mouse is regulative, while early development of Caenorhabditis is not. c. Mouse cells require higher concentrations of nutrients than do the cells of Caenorhabditis. d. Embryonic mouse cells differentiate much later than the cells of Caenorhabditis. e. Embryonic development in the mouse is controlled by transcription factors, while Caenorhabditis is not.