Select the experiments that can be characterized as reverse genetics: (check all that apply)  

_____  Generation and analysis of a knockout mouse
_____  Random mutagenesis of an organism, then selecting mutants by phenotype
_____  RNA interference of a gene in C. elegans
_____  Using reverse transcriptase to create a cDNA library


__X__  Generation and analysis of a knockout mouse
_____  Random mutagenesis of an organism, then selecting mutants by phenotype
__X__  RNA interference of a gene in C. elegans
_____  Using reverse transcriptase to create a cDNA library

Biology & Microbiology

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A drug binds to the active site of an enzyme. If it is bound to the active site of the enzyme, it prevents substrate binding. This drug would be considered a  

A.  noncompetitive inhibitor. B.  allosteric inhibitor. C.  allosteric activator. D.  competitive inhibitor.

Biology & Microbiology

Bacteria transformed with plasmids are plated on growth medium containing ampicillin and X-gal. White colonies on

the plate contain bacteria with a ____ plasmid, meaning the lacZ+ gene is ____.

a. recombinant; deleted from the plasmid b. nonrecombinant; intact c. recombinant; intact d. nonrecombinant; disrupted by the inserted DNA fragment e. recombinant; disrupted by the inserted DNA fragment

Biology & Microbiology

Isotopes are commonly used in medicine to determine if organs or organ systems are functioning properly. Physicians use radioactive iodine rather than elemental iodine to determine if the thyroid gland is functioning properly because:

1.Isotopes of iodine are radioactive, so they can be detected by imagery, and they act the same as elemental iodine. 2.Elemental iodine cannot be used by the human thyroid gland. 3.The isotope is more efficient than elemental iodine and would be processed by the thyroid gland at a higher rate. 4.Elemental iodine is in short supply.

Biology & Microbiology

Which of the following helps in chromosomal movement during cell division?

a. chloroplasts b. microtubule c. microfilaments d. peroxisomes e. intermediate filaments

Biology & Microbiology