Which of the following processes does not generate genetic variation during sexual reproduction?
A) Crossing over
B) Independent assortment
C) Random fertilization
D) All of the processes above generate genetic variation
D
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The primers in PCR are ____
a. fragments of mRNA b. designed to base pair with mRNA c. free nucleotides d. radioactive e. needed to initiate the reaction
Gross primary productivity refers to the total ____
a. quantity of solar energy available to the ecosystem in a given period of time b. quantity of solar energy reaching a given area of the ecosystem c. energy captured initially by the producers d. energy used by the heterotrophs of the ecosystem in a given period of time e. energy used by the producers for their growth and reproduction
In terms of transcription regulation, the role of a helix-turn-helix is most similar to that of a(n) .
A. zinc finger B. poly-A tail C. guanine cap D. sigma factor
How does immunofluorescence microscopy detect rabies in brain tissue of an infected animal?
A) Fluorescent-tagged antibodies provide light needed to see the virus particles in the microscope. B) Fluorescent-tagged antibodies bind to cytotoxic T cells that are attempting to kill infected cells in the tissue. C) Rabies virus naturally fluoresces under ultraviolet light. D) Fluorescent-tagged antibodies bind to the antibodies generated to fight the infection. E) Fluorescent-tagged antibodies bind to rabies antigen in the tissue and are visible in a specialized microscope.