The recent epidemic of MERS virus was caused by a(n)
A. adenovirus.
B. rhinovirus.
C. coronavirus.
D. flavivirus.
E. togavirus.
Answer: C
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Pregnant women with bacterial vaginosis are at risk of
A. placental insufficiency. B. being unable to nurse. C. being unable to deliver vaginally. D. having a premature baby.
Primary and secondary xylem that can no longer transport water and solutes, and can store defensive
compounds, is called
a. bark. b. heartwood. c. vascular cambium. d. sapwood. e. secondary epidermis.
Which of the following do(es) not depend directly on sunlight for energy?
I. producers (plants) II. consumers (animals) III. decomposers (bacteria) a. I only b. II and III only c. II only d. III only e. I and III only
Which of the following statements about digestion is true?
A) Digestion occurs only in the stomach. B) Digestion can be both mechanical and chemical, and it occurs both in the mouth and in the stomach. C) Mechanical digestion occurs only in the stomach; chemical digestion occurs only in the mouth. D) Digestion is the same thing as ingestion.