What was the long-term effect of the introduction of myxoma virus to control rabbits in Australia?
a. The rabbits were all killed.
b. Most rabbits became immune to the virus.
c. The virus killed off some of the rabbit population but also infected kangaroos and wallabies.
d. The virus became less virulent and the rabbits gained some immunity.
e. The virus had no effect.
ANSWER: d
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This image depicts the concept of
1.osmosis
2.diffusion
3.active transport
4.facilitated transport
“Descending” is a term associated with the
a. mouth. b. esophagus. c. stomach. d. small intestine. e. large intestine.
Which of the following statements is TRUE regarding a gastrovascular cavity?
A) Ingestion and elimination occur through a single opening. B) Digestion occurs in specialized chambers. C) Digestion is unnecessary because of the small size of the particles absorbed. D) Absorption occurs within collar cells. E) Digestion is exclusively intracellular.
Which option best describes the mechanism that causes a stoma to open?
A) K+ enters the guard cells and water follows passively, making the cells turgid. B) K+ activates water pumps in the guard cell membrane that make them turgid. C) K+ leaves the guard cells and water follows passively, making the cells flaccid. D) Loss of K+ from guard cells creates positive pressure and expands the guard cells.