The antifungals known as polyenes interact with ________, a lipid unique to fungus membranes.
A. cholesterol
B. ergosterol
C. mycolic acid
D. phospholipid
E. glycolic acid
Answer: B
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Instinctive behaviors are ____, while learned behaviors are ____
a. acquired from observation; acquired from practice b. taught by parents; acquired from trial and error c. incomplete the first few times they are displayed; apparently a product of reason d. genetically programmed responses; dependent upon experience e. dependent upon experience; genetically programmed responses
Four of the five kingdoms of organisms were apparent to the earliest scientists of Aristotle's time, and the fifth kingdom became apparent with the invention of the microscope.
a. true b. false
Which of the following statements regarding antibody function is FALSE?
A. They can prevent virus attachment to host cells. B. They can facilitate phagocyte attack on bacteria with a capsule (glycocalyx). C. They can penetrate host cells to bind intracellular antigens. D. They can facilitate cytotoxic attack by natural killer lymphocytes. E. They can bind more than one pathogen at a time, forming complexes.
The following quote is taken from a university extension publication for farmers:
"Grain poisoning, also known as grain overload or lactic acidosis, is usually the result of stock consuming large quantities of grain or pellets to which they are unaccustomed. Pasture-fed cows or feedlot cattle not yet adapted to grain may become acutely ill or die after eating only moderate amounts of grain, whereas stock accustomed to diets high in grain content may consume large amounts of grain with little or no effect." What is happening in the digestive system of the livestock that causes grain poisoning and why does a gradual shift in diet avoid this problem? What will be an ideal response?