Which of the following statements concerning osmosis is FALSE?
A. Osmosis requires a selectively permeable membrane.
B. During osmosis, water crosses to the side of the membrane with a lower solute concentration.
C. Cells placed in hypotonic solutions will gain water.
D. Crenation results when blood cells are placed in a hypertonic solution.
E. Osmosis stops when the system reaches equilibrium.
Answer: B
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You may have heard that monarch butterflies (and their caterpillars) are "poisonous" to many predators. What makes these insects so toxic?
A. Monarch caterpillars produce cardenolides in their digestive tracts. B. Monarch caterpillars use cardenolides from milkweed to synthesize toxins. C. Monarch caterpillars ingest milkweed latex which "chokes" their predators. D. Monarch caterpillars store cardenolides from milkweeds. E. Monarch caterpillars secrete latex from their bodies.
Boiling is very effective at removing most common waterborne pathogens
Indicate whether this statement is true or false.
Lamarck believed
a. that a substance called fluida moved through the nerves to areas of the body in need of change. b. in the inheritance of acquired characteristics. c. that giraffes’ necks elongated in response to stretching. d. that environmental pressures bring about changes in organisms. e. all of these were true.
Which one of the following damages the plasma membrane of a cell and was first used by Lister to control surgical infections?
a) Halogens b) Ozone c) Phenolics d) Ethylene oxide