The E. coli lac operon has ________ operator sequences.

A. four
B. two
C. three
D. one


Answer: C

Biology & Microbiology

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Sulfanilamide is an antibacterial drug that inhibits dihydropteroate synthetase, an enzyme that converts para-aminobenzoic acid (PABA) to folic acid (which is required for the synthesis of bacterial nucleic acids)

Sulfanilamide is a structural analog to PABA so most likely is a(n)______________ inhibitor of dihydropteroate synthetase. A. analogic inhibitor B. uncompetitive inhibitor C. mixed inhibitor D. competitive inhibitor E. allosteric inhibitor

Biology & Microbiology

Where do the final steps of fermentation occur?

a. Cell membrane b. Inner mitochondrial membrane c. Cytoplasm d. Matrix e. Grana

Biology & Microbiology

An individual carries the allele for polydactyly, but is normal. This is an example of __________

A. simple Mendelian inheritance B. incomplete dominance C. incomplete penetrance D. codominance E. gene dosage

Biology & Microbiology

What complex polysaccharide imparts flexibility to the unevenly thickened cell walls of collenchyma cells?

a. pectin b. cellulose c. lignin d. starch e. wax

Biology & Microbiology