Raising young rats alone, rather than in the company of other rats, may cause:
A) unusual aggression
B) changes in many brain regions
C) depression
D) a decrease in the size of an odor processing structure
Answer: D) a decrease in the size of an odor processing structure
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RNA and proteins combine in cells to form structures called ribosomes. Ribosomes contain the active site for peptide bond formation. Based on their chemical structures, do you think protein or RNA molecules actually form the active site within the ribosom
A) protein, because RNA cannot catalyze reactions B) RNA, because proteins cannot catalyze a reaction that involves another protein C) proteins, because only proteins can catalyze a reaction that involves another protein D) It could be either, because both molecules have catalytic properties.
According to the lac operon model proposed by Jacob and Monod, what is predicted to occur if the operator is removed from the operon?
A) The lac operon would be transcribed continuously. B) Only lacZ would be transcribed. C) Only lacY would be transcribed. D) Galactosidase permease would be produced, but would be incapable of transporting lactose.
Which of the following is not a cellular function associated with the microtubule cytoskeleton?
A. muscle contraction B. mitosis C. organization of organelles D. movement of cilia or flagella
Competition can occur for which of the following?
A. Food. B. Space. C. Mating. D. All of these answers are true.