The lacA gene found within the lac operon encodes for galactosidase transacetylase. This enzyme attaches a(n) ________ group to lactose and lactose analogs.

A. amino
B. hydroxyl
C. carbonyl
D. acetyl
E. carboxyl


D. acetyl

Biology & Microbiology

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Bacterial cells typically have ____ while eukaryotic cells have ____

a. a single circular chromosome; many linear chromosomes b. several circular chromosomes; many linear chromosomes c. one linear chromosome; many circular chromosomes d. two circular chromosomes; numerous circular chromosomes depending on the species e. numerous circular chromosomes depending on the species; many linear chromosomes

Biology & Microbiology

Reverse transcriptase creates a single-stranded DNA molecule that is complementary to an mRNA template

a. True b. False

Biology & Microbiology

Coughing is initiated by ________ located in the ________

A) stretch receptor : trachea B) chemoreceptors : trachea C) irritant receptors : nose and pharynx D) irritant receptors : trachea E) chemoreceptors : nose and pharynx

Biology & Microbiology

Lipopolysaccharide (LPS) in the outer membrane of Gram-negative bacterial cells is an example of

A) An endotoxin B) An exotoxin C) A cytokine D) An endonuclease

Biology & Microbiology