All of the following are characteristic of lichens EXCEPT
A) they are arranged in foliose, fruticose, or crustose morphologies.
B) they are a major food source for tundra herbivores.
C) they are used as indicators of air pollution.
D) they are a symbiotic relationship between a fungus and a protozoan.
E) they serve as primary producers in rocky ecosystems.
D
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Answer the following statements true (T) or false (F)
1. Hormones must bind a receptor to elicit a cell response, regardless of whether they operate locally or at long distances. 2. Auxin is a plant hormone that causes cells to shorten and allow plant growing tips to move toward the sun. 3. In terms of cell signaling, estrogen in animal cells works in a similar fashion as the plant hormone auxin via binding to intracellular receptors. 4. G proteins and Ras are activated when bound to GDP.
The ____________ of the blood is due to the presence of unfiltered plasma proteins. This pressure pulls fluid back into the capillaries by osmosis.
Fill in the blank(s) with the appropriate word(s).
In a line graph, the value of the independent variable is:
a. represented on the y-axis. b. represented as bars extending from the y-axis. c. represented as long lines extending from the right side of the graph. d. represented on the x-axis. e. represented as "slices in a pie."
Injectable drugs are tested for endotoxins by
A) the Limulus amoebocyte lysate test. B) counting the viable bacteria. C) filtering out the cells. D) looking for turbidity. E) culturing bacteria.