QUESTION: 49

Some recipes suggest that certain foods, such as sauces and frostings, be prepared in a double boiler, such as the one shown at the left.

Which statement best describes the advantage of using a double boiler?

The food in the top pan absorbs the heat energy from the water and keeps the temperature of both substances just below the freezing point of water.
The food in the top pan will be cooked at a temperature several degrees higher than the boiling point of the water.
As long as boiling water is in the bottom pan, the food will be cooked at the constant temperature of the boiling water.
Less energy is required for the food to reach a boiling temperature than for the water to reach a boiling temperature.
Twice as much food can be cooked using half the amount of energy.

Answer(s): C

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QUESTION: 50

Exhibit:

Based on the information, which statement best summarizes the role of the Gammarus as a biomonitor?

provide an effective tool for assessing the level of certain toxic metals in fresh water
provide for the rapid cleanup of water pollutants
prevent water pollution from occurring
destroy infectious bacteria and viruses
aid in measuring the photosynthetic rate of fresh water plants

Answer(s): A

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QUESTION: 51

Parasites often live continually within or on the external surface of the host. Parasites not only obtain food from the host, but they also may damage the tissues of the host.
Which pair BEST illustrates a host-parasite interaction?

frog-insect
honeybee-ant
dandelion-sunflower
human-tapeworm
catfish-trout

Answer(s): D

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QUESTION: 52

The graph at the left includes data from an experiment that showed how long a windup toy ran after different numbers of turns of the key.

What should have been done to ensure the accuracy and reliability of the experiment?

Do the experiment only one time.
Use a different windup toy to repeat the experiment.
Increase the number of turns of the key to more than seven.
Do the experiment several times with the same windup toy and same number of turns of the key.
Change the temperature of the environment in which the experiment is conducted.

Answer(s): D

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QUESTION: 49

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QUESTION: 52