A mutation that inactivates a regulatory gene of a repressible operon in an E. coli cell would result in _____
A) continuous transcription of the structural gene controlled by that regulator
B) complete inhibition of transcription of the structural gene controlled by that regulator
C) irreversible binding of the repressor to the operator
D) continuous translation of the mRNA because of alteration of its structure
A
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Bioassays
a. are performed in a test tube using killed cells. b. expose a population of living organisms to a test substance. c. are used for chemotherapy. d. are none of the above.
As you're sitting in your chair reading this test question, the process of breathing out (termed exhalation) is an active process
Indicate whether the statement is true or false
During replication, which enzyme unwinds the DNA double helix?
A. DNA polymerase I B. DNA helicase C. DNA primase D. DNA ligase E. DNA gyrase
Groups of similar cells that function together form ________
Fill in the blank(s) with correct word