The vector that transfers the malarial parasite to humans is the
A. fly.
B. amoeba.
C. meat.
D. mosquito.
Answer: D
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Failure to refrigerate a urine culture specimen when a long time will elapse between specimen collection and delivery to the laboratory is most apt to result in:
A) an abnormally high colony count B) an abnormally low white blood cell count C) contamination of the specimen by members of the patient's indigenous microflora D) death of the pathogen
Which of the following chemicals is a signal that induces systemic acquired resistance?
A. salicylic acid B. brassinosteroids C. systemin D. avr E. nitric acid
What defines a population in evolution?
A) Members of the same group that share a common ancestor B) Members of a single species C) Interbreeding members of the same species D) Multiple species interacting together
What is the primary purpose of the light reactions of photosynthesis?
A) to remove carbon dioxide gas from the atmosphere B) to release electrons needed to convert solar energy to chemical energy C) to create oxygen gas D) to produce glucose