A linear stretch of DNA that specifies the
sequence of amino acids in a polypeptide is
called a(n)
a. codon.
b. intron.
c. messenger.
d. gene.
e. enzyme
D
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Which of the following is not true of telomerase function?
A. Telomerase carries a 9-base DNA template complementary to 1.5 repeat units of the telomere sequence. B. One strand of the telomere sequence is elongated 6 bp at a time. C. The telomerase repeats its reaction many times in one telomere-binding event. D. The telomeres extended 3' end is made double-stranded by lagging strand synthesis. E. The RNA template is repositioned after each extension of the 3' end.
Fast-twitch muscle fibers are powered primarily by ATP from which source?
1.electron transfer chain 2.acetyl co-A 3.lactate fermentation 4.ethanol fermentation
Which of the following is the most appropriate pairing of microbe and biosafety level?
A) E. coli, BSL-3 B) anthrax, BSL-1 C) Ebola, BSL-2 D) methicillin-resistant Staphylococcus aureus (MRSA), BSL-2 E) tuberculosis, BSL-1
An anion is formed when
A) an atom gains one or more negatively-charged electrons. B) an atom loses one or more positively-charged protons. C) an atom loses one or more negatively-charged electrons. D) an atom gains one or more positively-charged protons. E) an atom has an equal number of positively-charged protons and negatively-charged electrons.