Researchers theorize that disease-causing agents trigger cancer by
A) causing persistent inflammation.
B) suppressing a person's immune system.
C) stimulating cells into extended periods of growth.
D) All of the answers are correct.
Answer: D
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Reasons complicating the development of vaccines to combat chronic diseases include _____. (Select all that apply.)
a. evasion of the host's immune system by the pathogen b. the polymorphic diversity of MHC class I and class II molecules c. the generation of inappropriate immune responses that do not eradicate the pathogen d. survival of the infectious agent for long periods inside the host e. high mutation rates in the pathogen.
How does methamphetamine differ from amphetamines?
A) It is more potent. B) It is less potent. C) It has fewer side effects. D) It is more commonly prescribed by doctors.
Body temperature increases slightly during exercise. A 1-2°C increase in muscle temperature during exercise would likely
A. increase enzyme activity. B. denatures enzymes. C. decrease enzyme activity. D. none of these answers is correct.
Which of the following statements about word part combinations is/are valid?
A. A word may be formed with a prefix and root only. B. A word may be formed with a root and suffix only. C. Both a and b D. Neither a nor b