Which of the following situations will give the highest level of lac operon transcription in E....
Which of the following situations will give the highest level of lac operon transcription in E. coli?
**this was my question from my professor there WAS NO additional information given to me. I assume the answer is no glucose and positive for lactose. I think the answer is B; i just wanted to check.
A. no glucose no lactose
B. no glucose plus lactose
C. glucose no lactose
D.All conditions will result in the same level of transciption
Please explain the correct answer too
Homework Answers
The correct answer is definitely B. No glucose plus lactose.
Lac operon genes code for proteins involved in lactose metabolism in bacteria. However, the transcription of genes is turned ON only when lactose is present in the media and is kept OFF when there is no lactose in medium.
case A: No glucose, no lactose : If there is no lactose, bacteria will not synthesize proteins for lactose metabolism.Hence no transcription of lac operon genes.
case B: No glucose, plus lactose: cells will rapidly utilize the lactose as carbon source for growth. Hence, transcription of lac operon genes will be high.
case C: glucose, no lactose: Since lactose is not present, cells will use glucose as carbon source. lac operon genes shall not be transcribed.
case D: all conditions will have different level of transcription.
So, correct answer is B.
Add Answer to:
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The following activity will give you practice with the two operons we discussed - the lac operon and the trp operon. Below are two scenarios to consider. You will need to determine whether or not transcription is occurring and describe what is happening in the cell using our operon vocabulary words - regulatory gene, RNA polymerase, operator, promoter, repressor, and genes. 1. Bobby Joe just enjoyed an In and Out milkshake, how will the E. coli in her stomach respond?...
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β-galactosidase (β-gal) is the product of the lacZ gene. The
diploid conditions represent the addition of a plasmid carrying
different components of the lac operon. Determine if β-gal will be
generated under the conditions. Assume that glucose is absent. A +
in the genotype indicates a functioning gene, while a – indicates a
loss-of-function allele. The OC is an operator mutant that cannot
bind the lacI protein. Use...
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