Regarding the trp operon, trpR? maps to a considerable distance from the structural genes. The mutation either inhibits the interaction with tryptophan or inhibits repressor formation entirely. In the presence of tryptophan in the medium, would you
expect the trp operon to be transcriptionally active? Explain.
What will be an ideal response?
With either of the two scenarios mentioned in the problem, the absence of repressor function in a repressible system means that there would be no repression of the operon. The operon would be transcriptionally active.
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Bacterial vaginosis may be the result of transfer from the rectum where the causative organisms usually reside in addition to occurring by means of sexual transmission.
Answer the following statement true (T) or false (F)
Which of the following is incorrectly paired?
a. Giardia lamblia—eukaryotic protozoan b. ringworm—eukaryotic animal c. influenza—virus d. cholera—bacterium
DNA
a. is one of the adenosine phosphates. b. is one of the nucleotide coenzymes. c. contains protein-building instructions. d. translates protein building. e. is single-stranded.
Which of the following genotypes would not usually be represented in a gamete?
A) AA B) AB C) Ab D) aB E) ab