Operons
1.are groups of genes in bacteria under control of a common promoter.
2.are transcribed into a polycistronic mRNA.
3.allow common regulation of genes.
4.are usually comprised of genes involved in a particular function.
5.All the options are correct.
5
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A P. bursaria cell that has lost its zoochlorellae is said to be aposymbiotic
It might be able to replenish its contingent of zoochlorellae by ingesting them without subsequently digesting them. Which of the following situations would be most favorable to the reestablishment of resident zoochlorellae, assuming compatible Chlorella are present in P. bursaria's habitat? A) abundant light, no bacterial prey B) abundant light, abundant bacterial prey C) no light, no bacterial prey D) no light, abundant bacterial prey
An example of an anabolic metabolism reaction is
a. monosaccharides + monosaccharides glycogen + H2O b. dipeptide amino acid + amino acid c. glycerol + 3 fatty acid molecules 3H2O + fat molecules d. glycogen many monosaccharides
During attachment of phage to E. coli, the phage
A. actively seek out the bacteria. B. randomly bump into the bacteria. C. attach to proteins or carbohydrates on the bacterial surface. D. attach to the bacterial RNA. E. randomly bump into the bacteria AND attach to proteins or carbohydrates on the bacterial surface.
The trp operon is ____ unless tryptophan is ____
a. turned on; available in the environment b. turned on; bound to the operator c. turned off; bound to the repressor d. turned off; bound to the promoter e. turned on; synthesized by the trp repressor gene