Without ____, living organisms would often experience major changes in pH in their cells
a. buffers
b. acids
c. surface tension
d. nonpolar bonds
e. bases
ANSWER: a
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A lioness begins her nightly hunt after spending the day beneath a tree in the Serengeti. What happens to the blood vessels in her body as she goes from resting to hunting?
A. Arterioles supplying her stomach and intestines contract. B. Arterioles supplying her stomach and intestines expand. C. Arterioles supplying her limb muscles contract. D. Arterioles supplying her limb muscles expand.
Within your body, there are two major categories of hormones. One category is the steroid (or lipid-soluble) hormones, and the other category is referred to as nonsteroid (or water-soluble) hormones, which are composed of proteins or, in some cases, just
amino acids. Estrogen and testosterone are examples of steroid hormones, whereas insulin is an example of a nonsteroid hormone. A researcher heats estrogen, testosterone, and insulin to a very high temperature. After heating the hormones, the researcher tests to determine whether they still work properly. She finds that estrogen and testosterone still function, but insulin does not. Based on the chemical nature of these molecules, explain why insulin no longer functions. What will be an ideal response?
Which stage marks the progression of HIV to AIDS?
A) stage I B) stage II C) stage III D) stage IV E) stage V
Fungi spores are haploid; what distinguishes haploid spores?
A. Haploid spores have a double set of chromosomes, half the number of chromosomes of diploid organisms. B. Like diploid organisms, haploid spores have a single set of chromosomes. C. Haploid spores have a single set of chromosomes, half the number of chromosomes of diploid organisms. D. Like diploid organisms, haploid spores have a double set of chromosomes.