The trp repressor blocks transcription of the trp operon when the repressor _____
A) binds to the inducer
B) binds to tryptophan
C) is not bound to tryptophan
D) is not bound to the operator
B
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Which of the following represents the activation energy needed for the enzyme-catalyzed reverse reaction, C + D ? A + B, in the figure?
A) a B) b C) c D) d E) e
The primary function served by erythrocytes is
A. transport of oxygen. B. defense against pathogens. C. buffering against changes in blood pH. D. sealing breaks in the walls of blood vessels. E. transport of water-soluble vitamins.
Areas of the body such as the lips or fingers are represented by ____ regions and arms and legs are
represented by relatively _____ regions.
a. large; small b. small; large c. motor; sensory d. sensory; motor e. cerebellum; brain stem
Which of the following is a true statement about proteins?
A. Proteins are used to insulate the body from cold and protect it from abuse. B. Extra proteins are stored in the liver and brain. C. Proteins are made up of amino acids bonded together. D. Proteins are used to produce ATP for the cell. E. Even small changes in temperature and pH will immediately destroy a protein's shape and function.