Laboratory Review ❮ 259Investigation 12: Fruit Fly Behavior
- To study kinesis of an insect such as a fruit fly, create a contraption known as a choice
chamber, which is designed to study which of two substances an organism prefers. For
example, one-half of the choice chamber may contain banana extract, the other distilled
water. Place the organism of interest into the choice chamber and record how many of
that organism are on each side of the chamber every 30 seconds. This procedure can also
be performed for a choice chamber that has differing temperatures, humidities, light
intensities, salinities, and other parameters.
Investigation 13: Enzyme Activity
- Enzyme reaction rate is affected by pH, temperature, substrate concentration, and
enzyme concentration. - To test the rate of reactivity of an enzyme and the difference it makes compared to the
speed of the normal reaction, run the reaction without an enzyme, then run it with your
enzyme, and compare. - To determine the ideal pH (or temperature) for an enzyme, run the reaction at varying
pH values (or temperatures) and compare.
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