Which factor contributes to the phenomenon of natural selection?
A) genetic homogeneity in a population B) lack of competition in mating
C) underpopulation D) competition for survival
Answer: D
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Which of the following describes an accurate order of events in translation?
A. Ribosomal translocation occurs before the first aminoacyl-tRNA molecule binds to the small subunit. B. Initiation of translation occurs only after the small subunit dissociates from the mRNA. C. The large subunit of the ribosome binds the mRNA before the small subunit. D. The first aminoacyl-tRNA molecule binds to the small subunit before the large subunit binds.
How is lac operon transcription regulated by the presence or absence of lactose?
a. When lactose is not available, the repressor will bind to the promoter and block RNA polymerase from transcribing the genes of the lac operon. b. When lactose is available, the repressor will bind to the lactose instead of blocking RNA polymerase. c. When lactose is not available, the repressor will bind to allolactose. d. When lactose if available, allolactose is produced and binds to the operator, blocking RNA polymerase. e. In the absence of lactose, transcription occurs at a low level resulting in the production of allolactose which in turn stimulates the cell to take up lactose.
The various flower parts are attached to the
a. style. b. receptacle. c. stigma. d. filament. e. calyx.
Membrane proteins are not very soluble in water, because they possess long stretches of non-polar amino acids that are
A. too long to interact with the water molecules. B. hydrophilic. C. hydrophobic. D. used as transport channels. E. are transmembranal.