Which immune system cells destroy infected or malignant host cells?
a. B lymphocytes
b. T lymphocytes
c. Natural killer cells
d. Neutrophils
C
Natural killer cells are an important cellular component of the immune response that serve to de-stroy infected or malignant host cells.
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After an action potential is triggered, the rapid increase in membrane potential can be attributed to
A. the closing of potassium leak channels. B. the opening of the voltage-gated potassium channels. C. the closing of sodium leak channels. D. the direction reversal of the sodium/potassium pump. E. the opening of voltage-gated sodium channels.
You are a professor supervising first year medical students. One student is examining the adrenal gland of his cadaver. "Wow!" he exclaims, "This person must have had an endocrine problem. Their adrenal gland lacks any kind of duct connecting it to the bloodstream. The hormones could only have oozed out." How do you respond?
A. "That makes their adrenal gland similar to an exocrine organ." B. "Do you see signs of adrenal insufficiency, such as low fat stores or muscle degeneration?" C. "That's normal. The hormones ooze out and diffuse into nearby capillaries, which is why endocrine glands are sometimes called 'ductless glands'." D. "Look carefully and you will see the nerves that transport the hormones into the bloodstream." Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about adrenal gland? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Match each root adaptive type with the plant in which it is found.
A. Pneumatophores B. Buttress roots C. Prop roots
When two tertiary proteins combine you have ___________ structure.
Fill in the blank(s) with the appropriate word(s).