Both smooth muscle fibers and cardiac muscle fibers:a
have striations.
b. are under involuntary control.
c. are multinucleate.
d. have a comparable intermediate resistance to fatigue.
e. have a comparable intermediate speed of contraction.
B
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Indicate whether the statement is true or false.
When chromosomes have either duplications or deletions, the chances that the mutation will be harmful are a function of:
A. its sizeâ€"the smaller the duplication or deletion, the greater the chance of harm. B. its sizeâ€"the larger the duplication or deletion, the greater the chance of harm. C. its locationâ€"if it occurs in a germ-line cell, it will be more harmful than if it occurs in a somatic cell. D. its position on the chromosomeâ€"if it occurs at the tip of a long arm, it is likely to be less harmful than if it occurs at the tip of a short arm. E. None of the answer options are correct.
Which of the following relationships best describes the partial pressure of oxygen (pO2) in the lung, red blood cells, and blood plasma?
A. pO2 lung < pO2 blood plasma < pO2 red blood cell B. pO2 blood plasma < pO2 lung < pO2 red blood cell C. pO2 red blood cell < pO2 lung < pO2 blood plasma D. pO2 red blood cell < pO2 blood plasma < pO2 lung
Which of the following is a disadvantage of using corn to manufacture ethanol as a fuel additive?
A. Ethanol contains far less energy than other fuels. B. Ethanol absorbs water and would thus corrode fuel pipelines used in transport. C. Use of corn as a fuel source drives up the cost of grain worldwide. D. All of these are disadvantages.