If an RNA does not normally code for a protein, then
A. it is mature mRNA.
B. the RNA is pre-mRNA.
C. it is probably tRNA or rRNA
D. the RNA is a lipid.
A. it is mature mRNA.
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Taq polymerase is
A. a reverse transcriptase. B. an RNA polymerase. C. from E. coli. D. a heat-stable DNA polymerase from Thermus aquaticus. E. an RNA polymerase AND from E. coli.
A DNA library is
A. a collection of recombinant vectors containing DNA fragments of a given organism. B. a collection of books about clones. C. a line of bacteria that contains a DNA fragment of interest. D. a series of restriction enzymes that can be used to produce a variety of sizes of DNA fragments. E. a collection of recombinant plasmids containing a particular gene from many different organisms.
The constant region of an antibody molecule is
A) the binding site for antigens. B) part of the heavy chains only. C) similar in all antibody molecules. D) the binding site for two antigens.
The findings of Pasteur and others have established that
A) living organisms regularly self-assemble (arise spontaneously) from nonliving matter. B) living organisms do not arise from nonliving matter today, nor did they arise from nonlife in the past. C) advanced organisms cannot arise from nonliving matter, but simple microbial life often does arise from nonlife today. D) life does not arise from nonliving matter today, but in the conditions of early Earth, such an event could have occurred.