Natural killer cells
A) are phagocytes that attack and kill pathogenic microorganisms.
B) attack virus-infected cells by releasing chemicals that lead to cell death.
C) tag pathogenic microorganisms with antibodies.
D) "eat" microorganisms that have been tagged with antibodies.
Answer: B
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Which of the following is true about membrane filters?
A. It can't be depended on to remove all viruses from liquids. B. It does not truly sterilize because it removes rather than kills microorganisms. C. It can be used only to remove organisms from liquids and it does not truly sterilize because it removes rather than kills microorganisms. D. It can be used only to remove organisms from liquids.
The tertiary structure of proteins is the three dimensional shape comprised of two or more polypeptides
Indicate whether the statement is true or false.
What bathygraphic feature is sometimes thought to be created by turbidity currents in the ocean?
a. Abyssal plains b. Sea mounts c. Submarine canyons d. Ocean basins
The control of the temperature of the body is an example of which of the following?
a. homeostatic mechanism b. positive feedback system c. endocrine function d. negative feedback system e. both homeostatic and negative feedback systems