Which of the following act at the post-translational stage to regulate expression of a gene?
A: Alternative splicing of exons.
B: Targeted degradation of the mRNA
C: Phosphorylation of a protein.
D: B and C.
E: A and C.
F: All of the above.
Answer: C: Phosphorylation of a protein.
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Explain the function of the helicases and why they are necessary
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Choose the true statements about the evolution of eyes in mice and fruit flies.
_____ The gene Pax6 codes for a transcription factor involved in lens formation in the mouse. _____ In the fruit fly, the gene eyeless codes for a transcription factor involved in lens formation. _____ When the mouse gene Pax6 is inserted into a fruit fly, it causes a vertebrate-type lens to form on the fly's leg. _____ The sequences of the genes eyeless and Pax6 are very different.
Which statement is NOT correct about the trp operon?
A. Tryptophan acts as the corepressor. B. The structural genes make products that are part of an anabolic pathway for the synthesis of tryptophan. C. Tryptophan binds to the repressor protein and inactivates it. D. It is normally turned off if tryptophan is present.
What were the original two Kingdoms that were established to organize living organisms?
a. Protista and Animalia b. Plantae and Eukarya c. Plantae and Animalia d. Bacteria and Eukaryote e. Eukaryote and Prokaryote