Which agency would be in charge of determining whether or not modified oil content is safe to eat?
A) FDA
B) USDA
C) EPA
D) USPTO
E) None of these choices
A
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In female humans and other mammals, dosage compensation is achieved by the inactivation of one of the two X chromosomes in each cell. Which one of the following does not occur in the X-inactivation mechanism of female mammals?
A. X-inactivation begins with a small region of the X chromosome that contains a gene for an X-inactivation specific transcript (Xist). B. Xist is expressed in low levels except when an X chromosome is about to be inactivated. C. When an X chromosome is about to be inactivated, Xist RNA transcripts increase markedly and undergo splicing, but do not encode a protein. D. Xist RNA is attracted to and associates with a protein called the X-chromosome inactivation center (XIC), which becomes entirely coated with Xist. E. Xist RNA recruits factors that promote DNA methylation, histone modification, and other changes associated with transcriptional silencing.
Nitrification
a. converts ammonium into nitrates. b. reduces nitrates to nitrites. c. converts nitrogenous compounds into free nitrogen. d. converts atmospheric nitrogen to ammonia. e. reduces ammonia to ammonium
Homology is evidence of ________.
A. .natural selection B. binomial classification C. artificial selection D. common ancestry
Which statement is true of all atoms that are anions?
A) The atom has more electrons than protons. B) The atom has more protons than electrons. C) The atom has fewer protons than does a neutral atom of the same element. D) The atom has more neutrons than protons.