The first topoisomerase identified was DNA topoisomerase I of bacteria. How was the activity assayed?

What will be an ideal response?


They tested fractions for the ability to relax superhelical lambda phage DNA.

Biology & Microbiology

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_____ will accumulate if a cell is treated with a proteasome inhibitor.

A. Secreted proteins B. Digested proteins C. Native proteins D. Unfolded proteins with ubiquitin attached E. Amino acids

Biology & Microbiology

The effect of directional growth shown in the accompanying figure is known to be caused by ____

a. thigmotropism b. gravitropism c. abscisic acid d. salicylic acid e. vernalization

Biology & Microbiology

A lung specimen from a pneumonia patient contains Gram-negative bacilli. Laboratory test results on the bacteria show they are nonmotile coliforms with a thick capsule. Which pathogen is the likely cause of the pneumonia?

A) Escherichia coli B) Enterobacter C) Hafnia D) Klebsiella E) Serratia

Biology & Microbiology

The energy released by ________ reactions is used to regenerate ________ which can then provide energy for ________ reactions.

A. anabolic, ATP, catabolic B. catabolic, glucose, anabolic C. anabolic, NADH, catabolic D. catabolic, ATP, anabolic

Biology & Microbiology