In the replication of phage containing positive-sense DNA,
A. the host's enzymes are used to make dsDNA.
B. the host's DNA polymerase uses the phage RNA as a template to make negative-sense DNA.
C. a phage-encoded DNA polymerase is used to make negative-sense RNA using the phage positive-sense RNA as a template.
D. a phage-encoded DNA polymerase is used to make DNA using the phage positive-sense RNA as a template.
A
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The water strider shown in the figure above is able to stand on water because of the ____ of water
a. covalent bonds b. surface tension c. van der Waals forces d. density e. hydration layer
Resident biota of the gastrointestinal tract include ________.
A. Bacteroides B. Streptococcus C. Lactobacillus D. Haemophilus E. All of the choices are correct.
When Bayliss and Starling conducted experiments to
determine what caused secretion of pancreatic juice, they a. cut the blood supply to the upper digestive tract. b. added acidic food to the small intestine and got secretions of pancreatic juices. c. cut the nerve supply to the upper digestive tract. d. got a response from the pancreas using extracts of cells lining the intestinal tract. e. did all of these except “cut the blood supply to the upper digestive tract.”
Why does immersion oil improve resolution?
A. It allows light to travel at a uniform speed on its way to the lens. B. It decreases the working distance. C. It increases the numerical aperture. D. It increases numerical aperture and maintains a uniform light speed. E. It increases the angle of refraction of the light.