In the 'Lysine Iron Agar', Black Precipitation in the tube butt can be interpreted as
A. LDC (+)
B. Hydrogen sulfide is produced
C. LDC (-)
D. LDA (+)
Ans: B. Hydrogen sulfide is produced
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Persons infected with HIV often die of opportunistic diseases because
A. HIV can transduce other viruses into virulent strains. B. HIV destroys T cells. C. HIV binds to antibodies. D. HIV is a retrovirus. E. HIV mutates easily.
A woman has six fingers, but one of her parents has five fingers. She marries a man who has
five fingers. What is the probability that they will have a child who is homozygous dominant for this trait?
a. 0 percent b. 25 percent c. 50 percent d. 100 percent
Suppose that you performed a version of the Hershey and Chase experiment, this time using 32P-labeled viruses that
insert their double stranded DNA into the DNA of the cells that they infect. The viral DNA is then treated as part of the cell's own DNA and is replicated during DNA replication and passed onto daughter cells when the cell divides. You infect a population of cells with the 32P-labeled viruses, and then let the infected cells go through two generations of cell divisions. If you then examine the cells, you should find 32P-labeled DNA in ____ of the cells.
a. none b. about 1/4 c. about 1/2 d. about 3/4 e. all
Antibody molecules may function by causing the
A) destruction of complement proteins. B) agglutination of viruses or bacteria. C) destruction of B and T cells. D) crystallization of antigenic particles.