What is the function pepsin
What will be an ideal response?
digest proteins
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Which of the following scenarios leads to the highest level of lac operon expression?
A. high glucose levels, lactose absent B. low glucose levels, lactose absent C. high glucose levels, lactose present D. low glucose levels, lactose present
What type of procedure is appropriate to isolate revertants from a population of threonine auxotrophic cells?
A. Threonine auxotrophic revertants could not be isolated on any type of media. B. Grow the auxotrophic cells on an agar plate without threonine; any colonies that form are presumed revertant. C. Grow the auxotrophic cells on and agar plate with threonine; any colonies that form are presumed revertant. D. Grow the auxotrophic cells in broth with threonine; if the broth becomes cloudy, revertants are presumed present.
The removal of a gene from an organism's genome to study its function is a technique known as
A) gene therapy. B) gene knockout. C) probe analysis. D) expression vector cloning. E) FISH.
Rhinovirus causes the common cold in humans and its genome is protected by a
a. capsule b. peptidoglycan wall c. plasma membrane d. nucleocapsid