People who have increased their maximum oxygen uptake through a program of sustained exercise do not have an increased
a. amount of blood pumped for each beat of the heart.
b. frequency of heartbeat while at rest.
c. thickness of the wall of the heart.
d. myoglobin content in the skeletal muscles.
e. blood supply to the muscle fibers.
B; As a person becomes more fit, his resting heart rate drops. All of the other choices mention positive effects of increasing one's aerobic fitness.
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An enzyme may lose its ability to function because of
(a) excessively high temperatures. (b) a change in its three-dimensional structure. (c) a large change in the pH of the environment. (d) all of the above.
An example of a base analog would be
A. EMS B. Nitrous acid C. 5BU D. Nitrogen mustards E. Acridine dyes
Which of the following statements best describes the benefits of radiation therapy?
A. Radiation therapy can be combined with other therapies, including chemotherapy. B. Radiation therapy can be directed against specific cells and tissues within the body. C. Radiation damages the DNA within cancer cells, either slowing down cell division or stopping it altogether. D. Radiation therapy may shrink tumors, making them easier to remove surgically. E. All of the choices are correct.
Most genetic diseases result from mutations that cause a gene to produce a non-functioning _____, which in turn blocks the functioning of a metabolic pathway
a) histone b) polysaccharide c) t-RNA d) enzyme e) codon