If the parents of a family already have two boys, what is the probability that the next two offspring will both be girls?
A) 1
B) 1/2
C) 1/3
D) 1/4
E) 1/8
D) 1/4
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A mutation in the gene encoding the enzyme that cuts F factor DNA during conjugation would result in
A. an inability to separate the recipient DNA from the donor DNA. B. an inability to draw the conjugated cells close enough to allow DNA transfer. C. the transfer of single-stranded DNA instead of double-stranded DNA. D. the inability of the donor DNA to move through the pilus. E. the inability of the recipient cell to replicate the F factor after transfer.
The tuberculin skin test, or the purified protein derivative (PPD) test, is based on:
a. delayed hypersensitivity cell-mediated immunity to certain antigenic components of the organism. b. injection of M. tuberculosis under the skin and subsequent mild cutaneous infection. c. antigen-antibody reactions occurring at the injection site. d. humoral-mediated immune response.
Which of these conditions should completely prevent the occurrence of evolution in a population over time?
a. All phenotypic variation between individuals is due only to environmental factors b. the population lives in a habitat where there are no competing species present c. the population size is large d. The environment is changing at a relatively slow rate
Explain the biochemical features that are unique to archaea.
What will be an ideal response?