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.
D) Trp binds to and changes the conformation of the repressor, which can then bind DNA and block transcription of the operon.
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The demographic transition is typically seen
a. when a country moves from an industrial phase into a more agricultural phase. b. as developed countries use more resources. c. when agriculture becomes more efficient. d. when epidemics lead to high death rates. e. as a country moves toward a more industrial phase.
The probability of producing a phenotypically normal child by two parents who are carriers for an
autosomal recessive disorder is a. 50 percent. b. 0 percent. c. 100 percent. d. 25 percent. e. 75 percent.
The plasma membrane gets new lipids from:
a. The lumen of the ER. b. The lumen of the Golgi apparatus. c. Making new lipids at the plasma membrane. d. The nucleus. e. None of the above.
Prior to N-linked glycosylation of a protein, a complex oligosaccharide is assembled in the endoplasmic reticulum on a lipid carrier called
a. a prenyl group. b. myristic acid. c. dolichol phosphate. d. phosphatidylinositol.