What is the concentration of persistent toxic chemicals at higher levels within a food chain or food web?
What will be an ideal response?
biomagnification
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What happens when an action potential arrives at an axon terminal?
A. Membrane voltages stimulate the axon. B. Sodium ions are pumped out of the cell. C. A neurotransmitter builds up so it can be used again. D. The action potential causes an influx of phosphorous ions. E. Chemicals relay the message at a synapse.
Basic vs applied science
What will be an ideal response?
Identify the structure indicated by the letter “B” in
the internal environment. a. tight junctions b. adhering junctions c. gap junctions d. homeostatic junctions e. none of these
Which of the following is NOT true of enzyme behavior?
a. Enzyme shape may change during catalysis. b. Enzymes cannot make something happen that would not happen on its own. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzymes speed up reactions.