Down’s syndrome individuals have how many chromosomes?
a. 23
b. 24
c. 45
d. 46
e. 47
ANSWER: e
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RecA is not the only protein that can promote branch migration. One example is called RuvAB. RuvAB:
A. can promote branch migration but the process is very slow. B. contains two donut-shaped RuvA hexamers, related in structure to DnaB helicase, that have nuclease activity. C. cleaves the Holliday intermediate by replacing one RuvA with RuvC. D. can reload DnaB helicase to reprime DNA replication after repair. E. does not require ATP hydrolysis.
A researcher observed a reduction in the number of chromosomes during cell division for a microbe, he concludes that the microbe must be
A. Eukaryotic B. Prokaryotic C. An archaean D. a virus Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about cell replication? How does it relate to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
How many RNAs can be transcribed from a single DNA template?
a. Two RNAs per DNA template can be transcribed, because DNA is double-stranded. b. Four RNAs, two per DNA strand, can be transcribed. c. It depends on the length of the DNA template strand. d. Only one RNA per DNA template can be transcribed. e. Hundreds of RNAs can be transcribed from a single DNA template.
Viruses, Rickettsia, and Chlamydia are described as obligate intracellular parasites because they can only be propagated inside living host cells. Which of the following would be appropriate for their cultivation?
A. enriched media B. differential media C. cell or tissue cultures D. media that contains sheep red blood cells