In humans, germ cells are located in the
A. ovaries and bone marrow.
B. ovaries.
C. bone marrow.
D. testes and ovaries.
E. testes.
D. testes and ovaries.
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The Sanger sequencing approach developed in the 1970s
A. has been rendered obsolete by the development of fundamentally different methodologies. B. is still the main approach used to determine nucleotide sequences. C. is applicable to RNA but not DNA. D. is useful for sequencing small DNAs but is not applicable to genome sized DNA molecules.
Which of the following genes may attribute to the virulence of H. pylori by encoding for outer membrane proteins that mediate adherence to a specific blood group antigen on the surface of gastric epithelial cells?
a. babA b. iceA c. cagA d. vacA
You cut a plasmid with a restriction enzyme that cuts it into three pieces — one fragment is 240 base pairs, one fragment is 600 base pairs, and one fragment is 1200 base pairs. You carry out electrophoresis of the digested sample. Which of the fragments will be closer to the top of the gel where the sample was inserted?
A. The 240 base pair fragment. B. The 600 base pair fragment. C. The 1200 base pair fragment. D. They will all be near the top because they all have sticky ends. E. It depends on the charge of the DNA fragment.
Helicase ________.
A. supercoils DNA B. unwinds RNA C. winds RNA D. unwinds DNA