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

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The metal atom bound to the heme group of hemoglobin is

A. sodium. B. copper. C. zinc. D. iron. E. manganese.

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Lysosomes are responsible for the assembly of amino acids into proteins.

a. true b. false

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Which gene is recessive in the ABO blood group?

A. A B. B C. O D. none of them

Biology & Microbiology