The E. coli lac operon has ________ operator sequences.
A. four
B. two
C. three
D. one
Answer: C
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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
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
Where do the final steps of fermentation occur?
a. Cell membrane b. Inner mitochondrial membrane c. Cytoplasm d. Matrix e. Grana
What complex polysaccharide imparts flexibility to the unevenly thickened cell walls of collenchyma cells?
a. pectin b. cellulose c. lignin d. starch e. wax