Which of the following can be used as a vector for gene therapy?
A. Liposomes
B. Parvoviruses
C. Adenoviruses
D. Retroviruses
E. All of the answers are correct
D
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Which of the following types of selection favors the survival of individuals with the intermediate phenotype?
A. Disruptive selection B. Stabilizing selection C. Directional selection
DNA polymerase
a. is an enzyme. b. adds new sugars to a strand. c. proofreads RNA strands to see that they are correct. d. unwinds the DNA molecule during repair. e. is made of uracil.
The release of phosphate-containing detergents into a river would
A) kill algae. B) increase algal growth. C) kill bacteria. D) improve the water quality. E) None of the answers is correct.
All of the following are functions of integral membrane proteins EXCEPT ____
a. transport of polar molecules b. reception of chemical signals form other cells c. cell division d. recognition of other cells as being "like" e. cell-cell binding