A new operon is discovered in a bacterium. The control of this operon is affected by a protein that is
made by another gene, and is made in an active form that binds to the DNA near the operon to prevent
transcription. This is an example of __________ control.
a. positive
b. negative
c. activational
d. repressing
e. inducing
B
Biology & Microbiology
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Who proposed that in any DNA molecule, A =T and G = C?
A. Hershey and Chase B. Chargaff C. Franklin D. Watson and Crick
Biology & Microbiology
The metal atom bound to the heme group of hemoglobin is
A. sodium. B. copper. C. zinc. D. iron. E. manganese.
Biology & Microbiology
Lysosomes are responsible for the assembly of amino acids into proteins.
a. true b. false
Biology & Microbiology
Which gene is recessive in the ABO blood group?
A. A B. B C. O D. none of them
Biology & Microbiology