Which of the following drugs inhibits nucleic acid synthesis specifically in most bacteria?
A. fluoroquinolones
B. actinomycin
C. rifampin
D. tetracycline
E. 5-fluorocytosine
Answer: A
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Glucose biosynthesis is called _____
a. glyconeogenesis b. fatty acid oxidation c. glycolysis d. pentose phosphate pathway e. gluconeogenesis
How does tryptophan, the end product of the trp operon, function in the regulation of the operon?
A) Trp binds to and inhibits the repressor, thus allowing transcription of the operon. B) Trp binds to and activates the repressor, which then binds to DNA to allow transcription of the operon. C) Trp binds directly to DNA and inhibits transcription of the operon. D) Trp binds to and changes the conformation of the repressor, which can then bind DNA and block transcription of the operon.
What is the function of phloem?
a. It helps the plant prevent desiccation. b. It transports water and minerals. c. It transports photosynthetic sugars. d. It allows for gas exchange. e. It slows evaporation from the plant.
In mitosis, cells duplicate their chromosomes once and divide once. In meiosis, cells duplicate their chromosomes ________ and divide ________
A) twice; once B) once; once C) twice; twice D) once; twice