Ways to view Ecology
What will be an ideal response?
Levels of complexity
roles/types of organisms
spatial and temporal scales
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Members of the genus Actinomyces are either facultative or strict anaerobes that require ________ for optimal growth.
Fill in the blank(s) with the appropriate word(s).
Clostridium botulinum toxin is
A. heat-stable. B. an exotoxin. C. endotoxin. D. heat-sensitive. E. an exotoxin AND heat-sensitive.
The process of sporangium formation and endospore maturation requires 6-8 hours. What is most likely to result if the temperature of the environment was raised to 100°C about 2 hours after the process started?
A. The endospore would not form properly because it is not yet heat resistant. B. The chromosome in the endospore would likely carry mutations. C. The organism would be termed a hyperthermophile. D. The endospore would form more slowly and be heat resistant. E. The endospore would form properly but would be unable to germinate.
What happens when an action potential arrives at an axon terminal?
a. Membrane voltages stimulate the axon. b. The action potential starts a chain reaction. 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.