Cancer-causing mutations of the cell cycle ____
a. increase the speed of the cycle
b. cause the cell to bypass checkpoints in the cycle
c. eliminate one or more stages of the cycle
d. interfere with S phase of the cycle
e. stop the cycle and cause a build-up of cell toxins
b
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Which of the following is a bone of the lower
leg in humans?
a. femur b. fibula c. radius d. ulna e. humerus
Keratin is an important aspect of nonspecific defense because it
A. is toxic to pathogens. B. creates a physical barrier against pathogens. C. physically restricts pathogens to a specific region. D. destroys pathogens.
For many enzymes, the rate of product formation increases as the concentration of the substrate increases. Eventually the rate of the reaction reaches a maximum at which further increases in the concentration of the substrate have no effect. Why?
A) At high concentrations of substrate, the activation energy of the reaction decreases. B) The enzyme is no longer specific for the substrate. C) At high concentrations of substrate, the reaction is endergonic. D) At high concentrations of substrate, all of the enzyme active sites are being occupied by substrate molecules. E) At high concentrations of substrate, the activation energy of the reaction increases.
Which parts of the atoms interact in a chemical reaction?
A) protons B) neutrons C) ions D) electrons E) isotopes