A scientist wishes to develop an antimicrobial agent that specifically targets replication elongation in Escherichia coli without interfering with proteins that catalyze other replication processes. Which of the following experimental designs is most appropriate for the scientist to explore?
A. Modify an existing antibiotic to act as a competitive inhibitor of DNA polymerase I
B. Design a drug that modifies the structural configuration of DNA at the oriC locus
C. Create a novel protein that acts as a competitive inhibitor of the DNA ligase binding site
D. Develop a molecule that interferes with the DNA-binding ability of DNA polymerase III core enzyme
Answer: D
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Which of the following chemicals is used to
induce polyploidy?
a. colchicine b. ethylene c. gibberellin d. cytokinin e. auxin
A 37-year-old man has a self-limited with an explosive onset of watery diarrhea and nausea, vomiting, abdominal cramps, headache, and low-grade fever 2 days after winning a sushi eating contest. Which of the following is the cause of the diarrhea?
A. Salmonella typhi B. Vibrio parahaemolyticus C. Shigella dysenteriae D. Vibrio vulnificus E. Vibrio cholerae
The Nod factor is an important component of
A. the Calvin Cycle. B. legume-bacterial interactions. C. mycorrhizal-terrestrial plant interactions. D. the formation of the digestive enzymes of carnivorous plants. E. trichloroethylene metabolism.