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...
Which of the following provides the basis for Mendel’s laws of segregation and independent assortment?
a. Meiosis I b. Meiosis II c. Interkinesis d. Cytokinesis
A testcross consists of
a. a cross of two pure-breeding forms to find out which form of a gene is dominant. b. a cross between two unknown forms to determine their genotypes. c. a cross between an offspring and its parent. d. a cross of an F1 hybrid to an individual that is homozygous recessive. e. a cross of two F2 individuals to produce an F3 generation.
Complete oxidation (breakdown) of glucose in aerobic respiration can yield a net output of _____ ATP.
A) 38 B) 45 C) 2 D) 6
Select the option that best finishes the following statement: "Evolution is a process __________."
(a) that can be understood based on the principles of mutation and selection. (b) that results from repeated cycles of adaptation over billions of years. (c) by which all present-day cells arose from 4–5 different ancestral cells. (d) that requires hundreds of thousands of years.