urgent assignment due biology

Dec 11th, 2014
DotaCN
Category:
Biology
Price: $40 USD

Question description

Chapter 25

How does degeneracy of the genetic code minimize the effects of mutations?

What is the wobble hypothesis, and how is it consistent with the third-base degeneracy of the genetic code?

What features of a tRNA allow its unique recognition by an aminoacyl-tRNA synthetase?

What are the differences between the tRNA-protein interactions of class I and class II synthetases?

How is the error rate of an aminoacyl-tRNA synthetase minimized?

Chapter 26

In a negative inducible gene system, what would be the effect of a mutation that eliminates the regulator?

In a positive inducible gene system, what would be the effect of a mutation that eliminates the regulator?

In the lac operon, what would be the effect of a mutation in the operator?

Why does the lac operon need three operators?

How does a hairpin structure in the mRNA cause transcription termination on the DNA?

Chapter 13

 Why would a DNA polymerase enzyme need to have nuclease activity?

 How does the DNA polymerase “know” that it has incorporated an incorrect base?

 Why can’t the DNA polymerase move continuously on both strands?

 Since SSB does not have an enzymatic function, why is it essential for replication?

 Why couldn’t the transcription RNA polymerase be used to synthesize the primer?


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