During a cis-trans complementation assay, two lac- strains of bacteria are crossed. The progeny cells exhibit a lac- phenotype. What does this indicate?

What will be an ideal response?


The two mutations are in different genes that encode different products. The two mutant strains complement each other to create a functional cell that can metabolize lactose.

Biology & Microbiology

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Polymerase chain reaction requires ________, a DNA polymerase from a bacterium that lives in hot springs.

A) Taql B) telomerase C) T7 DNA polymerase D) Pol III

Biology & Microbiology

Describe the pathway of information in a neuron.

What will be an ideal response?

Biology & Microbiology

A polycistronic mRNA contains multiple _______________

A) promoters B) Shine-Dalgarno sequences C) Kozak sequences D) mRNAs E) polypeptide-producing sequences

Biology & Microbiology

Denitrification ____.

A. converts ammonium to nitrates B. reduces nitrates to nitrites C. reduces ammonia to ammonium D. converts atmospheric nitrogen to ammonia E. converts nitrates to nitrogen gas

Biology & Microbiology