Which one of the following is CORRECT regarding catabolic repression
A. During catabolic repression cAMP binds to other sugars so glucose could be used first
B. It is a a system that allows glucose to be consumed in the presence of some other carbon sources
C. It represses glucose metabolism
D. It allows lactose to be the preferred sugar source over arabinose
E. It regulates amino acid biosynthesis
Ans: B. It is a a system that allows glucose to be consumed in the presence of some other carbon sources
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The major reason why there are fewer antiprotozoan drugs than antibacterial drugs is because
A. antiprotozoan drugs cost much more than antibacterial drugs to develop. B. antiprotozoan drugs are only effective when injected. C. it is much more difficult to develop selectively toxic antiprotozoan drugs since protozoan cells are eukaryotic. D. antiprotozoan drugs are not needed in the United States.
Reversible reactions in a cell rarely reach equilibrium because
a. the products are generally reactants in other reactions and are thus immediately used. b. a cell at equilibrium is dead. c. most reactions in a cell are not reversible, allowing the cell to devote additional resources to regulating the few reversible reactions that do occur. d. cells have no way of measuring the relative ratios of reactants and products. e. conditions in the cell change too rapidly for any reaction to ever reach equilibrium.
What molecules are released by activated helper T cells?
A. antigens B. immunoglobulins C. cytokines D. antibodies
Taxis is defined as
A. the learning of a behavior that is associated with consequences of the behavior. B. a movement towards or away from a stimulus. C. a motor response initiated by a stimulus, continuing to completion of the response. D. an instantaneous, automatic response to a stimulus. E. rapid learning of behaviors by an animal during a restricted time in the animal's life.