In an operon, the ________ acts as an on/off switch
A) operator
B) promoter
C) activator
D) repressor
A
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When chromosomes have either duplications or deletions, the chances that the mutation will be harmful are a function of:
A. its sizeâ€"the smaller the duplication or deletion, the greater the chance of harm. B. its sizeâ€"the larger the duplication or deletion, the greater the chance of harm. C. its locationâ€"if it occurs in a germ-line cell, it will be more harmful than if it occurs in a somatic cell. D. its position on the chromosomeâ€"if it occurs at the tip of a long arm, it is likely to be less harmful than if it occurs at the tip of a short arm. E. None of the answer options are correct.
The rate of background extinctions is calculated to be species per year per million species.
A. 0.1 to 1.0 B. 1.0 to 10 C. 0.001 to 0.01 D. 10 to 100 E. None of the answer choices is correct.
In the DNA sequence recognized by EcoRI,
where is the cut made?
a. after the G b. between the two As c. between the two Ts d. after the second T e. after the C
Scientists like to use fluorescent proteins for various types of recombinant DNA procedures. You have a very small amount of the gene for a fluorescent protein. You'd like to make a fluorescent bacterium (!). Which of the following represents the correct sequence of procedures that you would use?
a. Transform the vector into the bacteria. Amplify the gene using PCR. Insert the gene into a plasmid vector. b. Amplify the gene using PCR. Transform the vector into the bacteria. Insert the gene into a plasmid vector. c. Amplify the gene using PCR. Insert the gene into a plasmid vector. Transform the vector into the bacteria. d. Insert the gene into a plasmid vector. Amplify the gene using PCR. Transform the vector into the bacteria.