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Which of the following radioactive element is generally involved in RIA?
A. Tritium
B. Carbon-14
C. Iodine-125
D. All of these
The lac operon is translated into __________ proteins.
A.
1
B.
2
C.
3
D.
4
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In the presence of tryptophan in the cell, the repressor is __________
A. bound to tryptophan
B. bound to DNA
C. bound to both DNA and tryptophan
D. bound to neither tryptophan nor DNA