Endolithic phototrophic communities are MOST common in ________ environments
A) dry
B) hot
C) humid
D) windy
Answer: A
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Below are partial results of chemical sampling of one stream. What do these results tell you about the suitability of this stream as fish habitat? What are likely causes for these values?
What will be an ideal response?
In the IP3/DAG pathway, what is the effector molecule?
a. IP3 b. DAG c. PIP2 d. phospholipase C e. calcium
According to the cohesion-tension mechanism of water transport, cohesion occurs because
a. waxy coatings on insides of xylem keep water molecules together in the xylem. b. evaporation removes water from the leaves. c. water molecules tend to form hydrogen bonds with each other. d. water is pushed into the xylem by bulk flow. e. water is pushed into the xylem by phloem pressure.
The “trigger zone” of a neuron is found at the ____
a. axon terminal b. dendrite terminal c. cell body d. axon hillock e. synapse