Various techniques have been developed to isolate strains of bacteria carrying a particular mutation. One of them is, bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells. In this environment,
A. wild-type cells die; mutant cells survive.
B. wild-type cells survive; mutant cells die.
C. both wild-type and mutant cells survive.
D. only double mutants survive.
E. both wild-type and mutant cells are killed.
Answer: A
You might also like to view...
A drug binds to the active site of an enzyme. If it is bound to the active site of the enzyme, it prevents substrate binding. This drug would be considered a
A. noncompetitive inhibitor. B. allosteric inhibitor. C. allosteric activator. D. competitive inhibitor.
The binding of a neurotransmitter to ligand-gated Na+ channels will cause ____ in the postsynaptic
membrane.
a. depolarization b. hyperpolarization c. repolarization d. apolarization e. depolarization and repolarization
Kinase enzymes
A) add phosphate groups. B) always inhibit target molecule activity. C) bind tightly by wrapping around a target molecule to regulate its activity. D) remove phosphate groups. E) metabolize glucose.
It is possible for an individual to be genotypically one gender but appear to be the opposite gender. Suppose an individual is genotypically male (XY) but has developed as a female. Explain what has happened and when it might have happened
What will be an ideal response?