There is a mutation in the operator of the trp operon in a cell such that the trp repressor is unable to bind to the operator. If tryptophan is added to the cell, what will happen?
A) Tryptophan will bind to the repressor, and trp enzymes will be produced.
B) Tryptophan will bind to the repressor, and trp enzymes will not be produced.
C) Tryptophan will not bind to the repressor, and trp enzymes will be produced.
D) Tryptophan will bind to the operator, and trp enzymes will be produced.
Answer: A
You might also like to view...
In a two-point test cross, 36 of the offspring were recombinant types. The remaining 64 offspring were
parental types. How many map units separate the two loci? a. 28 b. 36 c. 64 d. 78 e. 100
If a promoter region is mutated in such a way that it can no longer be methylated, what would the most likely effect be?
A) The gene linked to the promoter would be expressed at regular levels. B) The gene linked to that promoter would be over expressed. C) The gene linked to the promoter would be under expressed. D) The gene linked to that promoter would not undergo replication. E) The gene linked to the promoter would still be expressed, but the protein should contain different amino acids.
Which of the following is responsible for the waterproofing of skin?
A. hyaline cartilage B. wax C. keratin D. mucus E. sweat
Which of the following equations represents the total water potential of a plant?
A. s2 + p2 = w2 B. ?p = ?w + ?s C. ?w = ?p + ?s D. ?s = ?p + ?w E. ?w = ?s ¸ ?p