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QUESTION

22) We know the genetic code is overlapping because... a.an overlapping code would be insufficient to encode the 20 amino acids b.single point deletion mutation will restore the normal reading frame c

22) We know the genetic code is overlapping because...

a.an overlapping code would be insufficient to encode the 20 amino acids

b.single point deletion mutation will restore the normal reading frame

c.a single base pair substitution can only alter a single amino acid

d.three single-nucleotide deletion mutations will restore the normal reading frame

e.None of the above

23) Deleting the Lac operator (lacO) will have the same phenotype of which of the following conditions?

a.lacP-

b.lacI-

c.LacIs

d.Glucose in the media

e.A mutated lac operon CAP binding site that cannot bind CAP

24) You isolate Lambda phage that will form lysogens that are resistant to induction. What would be a potential explanation for this?

a.Decreased expression of cII

b.Mutated cos sites

c.Noncleavable cI

d.Inactive pAQ

e.OL and OR elements deleted

25) Binding of CI to the OR2 operator site is favored by the presence of CI in the OR1 site. This is an example of:

a.Exclusivity

b.Cooperativity

c.Enhancement

d.Transcriptional inhibition

e.Cis-dominance

26) Ethidium bromide reduces the twist of DNA by unwinding the helix. You isolate a closed circular plasmid from E. coli (negatively supercoiled). What will the effect on the WRITHE of this plasmid be as you add Ethidium?

a.Decrease

b.Increase

c.No change

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