Concerns about the small size of humpback whale populations led to a collaborative study of their
a. geographic distribution.
b. adaptive characteristics.
c. population growth rates.
d. environmental changes.
e. genetic variability.
E
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You are asked to determine whether an unknown tissue specimen comes from a plant or an animal
Closer inspection with an electron microscope reveals that the cells are connected by small openings lined by extensions of the cell membrane and containing tubules connecting the endomembrane systems of adjacent cells. Which of the following conclusions can be drawn from your observations? A. The openings are plasmodesmata, so the tissue must come from a plant. B. The openings are plasmodesmata, so the tissue must come from an animal. C. The openings are gap junctions, so the tissue must come from a plant. D. The openings are gap junctions, so the tissue must come from an animal. E. The openings could be either gap junctions or plasmodesmata, so it cannot be determined whether the tissue came from a plant or an animal.
The most important ion in controlling the movement of water into and out of the guard cells is
A. sodium. B. hydrogen. C. carbon. D. nitrogen. E. potassium.
Where are grassland biomes typically found?
a. in the middle of a continent b. in the rain shadow of a mountain range c. on the windward side of a mountain range d. on the leeward side of a mountain range
e. adjacent to the shore of a continentThe value of photosynthetically active radiation above which no further increase in photosynthesis occurs is referred to as
A) photoinhibition. B) chlorophyll compensation. C) the light compensation point. D) the light saturation point.