Complement proteins ____
a. prevent pathogens from entering the interior environment of the body
b. bore channels in targeted cells, causing them to burst
c. inactivate other complement proteins
d. bind to pathogens making them a target for antibodies
e. destroy healthy body cells as well as invading microorganisms
ANSWER: b
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If a cell contains 95% water in its cytoplasm and the environment surrounding the cell contains 90% water
A. water will flow into the cell by osmosis. B. water will flow out of the cell by active transport. C. water will flow out of the cell by osmosis. D. water will flow into the cell by active transport. E. water will flow into the cell by facilitated diffusion.
The most prevalent mineral ion stored in and
released from bone tissue is a. phosphorus. b. iron. c. calcium. d. magnesium. e. manganese.
You find a strange infection in your mouth and visit your dentist. The dentist said the new organism was prokaryotic because it had ________
A) DNA in the nucleus B) membrane-bound organelles C) relatively large cells D) circular DNA