Which of the following accurately describes the pH scale?
A. The pH scale runs from 0 (most acidic) to 14 (most basic), with 7 as a neutral.
B. The pH scale runs from 0 (most acidic) to 14 (neutral), with 7 as an average acidity level.
C. The pH scale runs from 0 (most basic) to 14 (most acidic), with 7 as a neutral.
D. The pH scale runs from 0 (neutral) to 14 (most acidic), with 7 as an average acidity level.
Answer: A
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Which of the following is a component of the spore—or zygote—wall (in mosses, ferns, gymnosperms, and angiosperms) and helps prevent the desiccation of these structures?
A. sporangium B. sporopollenin C. chitin D. peptidoglycan E. sporangia
A key influence of the atrioventricular node on the heartbeat is to
A. speed up the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. B. slow down the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. C. act as a barrier that prevents the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. D. not alter the speed at which the electrical impulse to contract passes from the atria to the ventricles. E. block backflow of blood from the aorta into the right ventricle.
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