Mammalian erythrocytes (red blood cells) are particularly useful for studies of the plasma membrane because
a. they have few peripheral proteins.
b. they have only one membrane, the plasma membrane.
c. their plasma membrane is not associated with a cytoskeleton.
d. their plasma membrane contains no cholesterol.
Ans: b. they have only one membrane, the plasma membrane.
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A large respiratory surface
a. results in a slow rate of gas exchange. b. results in a faster rate of gas exchange. c. has no effect on the rate of gas exchange. d. is important to support the respiratory needs of large animals. e. results in a faster rate of gas exchange, and is important to support the respiratory needs of large animals.
What type of mechanism controls body
temperature?
a. positive feedback b. inhibition c. negative feedback d. cyclical feedback e. none of these
Working as a pathologist, you are told that a corpse is from a person who lived and died in an area where food is generally severely deficient in iodine. You would make sure to look near the neck of this person for evidence of
a. hepatitis. b. goiter. c. acromegaly. d. diabetes. e. osteoporosis.
Why has DNA analysis been effective recently at overturning faulty criminal convictions?
A) Genetic evidence can determine if an individual is predisposed to criminal behavior. B) Scientific evidence was not admissible in U.S. courts until just recently. C) Juries have tended to exhibit biases against DNA evidence in the past; however, that trend is now changing. D) DNA evidence is a more reliable individual identifier compared to eyewitness testimony. E) Scientists only discovered in 2005 that each individual's DNA is unique.