The first line of defense against invading microorganisms is nonspecific.
Answer the following statement true (T) or false (F)
True
It is true that the first line of defense against invading microorganisms is nonspecific.
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In science, experiments are widely used. Are experiments better than observational studies? Discuss the merits and shortcomings of both types of studies.
What will be an ideal response?
Like the insects, the arachnids (spiders and so on) have
(a) three pairs of walking legs. (b) one pair of antennae. (c) true mandibles. (d) an abdomen.
Destruction of lymphocytes with self-specificity is called ________.
A. clonal deletion. B. clonal selection. C. differentiation. D. proliferation. E. hypersensitivity.
What is the ultimate explanation for modern human preference for fatty foods?
a. When we eat fatty foods, taste receptors on our tongue are stimulated, sending an action potential to our brain triggering the "do-it-again" centers. Fatty foods have nine calories per gram, unlike carbohydrates and proteins, which have four calories b. per gram, and in our environment we need to maximize our caloric intake in order to maximize our fitness. c. Ancestral humans who preferred fatty foods were less likely to starve, leaving more offspring in the next generation. d. We do not actually prefer fatty foods; we prefer sugary foods. e. We like the way that lipid-rich foods taste.