To Check the Effect of Cold Temperatures on the Battery's

question 366

Multiple Choice

To check the effect of cold temperatures on the battery's ability to start a car researchers purchased
A battery from Sears and one from NAPA. They disabled a car so it would not start, put the car in a
Warm garage, and installed the Sears battery. They tried to start the car repeatedly, keeping track of
The total time that elapsed before the battery could no longer turn the engine over. Then they
Moved the car outdoors where the temperature was below zero. After the car had chilled there for
Several hours the researchers installed the NAPA battery and repeated the test. Is this a good
Experimental design?

• A) No, because they should have tested other brands of batteries, too.
• B) No, because the car and the batteries were not chosen at random.
• C) No, because temperature is confounded by brand.
• D) Yes
• E) No, because they should have tested more temperatures.

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Definitions:

Troponin

A protein complex involved in muscle contraction; often measured to diagnose heart attacks.

Sarcolemma

The thin, plasma membrane that surrounds the cytoplasm of muscle cells, critical in muscle contraction.

Graded Fashion

A term referring to a response that varies in degree or intensity, rather than being an all-or-nothing reaction.

Motor Units Recruited

The activation of a set of motor neurons and their associated muscle fibers, used to generate an appropriate level of force during muscular contraction.