Which structure or compartment is part of the symplast?
A) the interior of a vessel element
B) the interior of a sieve tube
C) the cell wall of a mesophyll cell
D) an extracellular air space
E) the cell wall of a root hair
Answer: B
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An ecologist catches 100 frogs from a pond, marks them, and releases them back into the pond. After a few days, another 100 frogs are captured and 10 have the marks on them. How many frogs are in the pond?
A. 900 B. 100 C. 1,000 D. 90 E. 10,000
Epinephrine
A. is an antihistamine. B. causes desensitization. C. inhibits the activity of lymphocytes. D. reverses constriction of airways.
If a mammal suffered damage to the temperature sensor in its brain, what would be the result?
A. The animal would fall back onto a more primitive ectothermic mode of regulation. B. Only the integumentary system is required to sense temperature changes. Body temperature would remain stable. C. The animal would have to rely on shivering instead of vasoconstriction to maintain body heat. D. The integrating center would not receive inputs to compare to the set point. Body temperature could rise or fall to dangerous levels.
Explain the concept of selective toxicity
What will be an ideal response?