A golfer wants a new set of clubs to improve her game. In an experiment, she tests different drivers made from different materials. She compares the drivers to the distance of her shot. In this simple experiment, the independent variable is the
A. type of material used to make the golf ball.
B. swing speed of the golf club prior to striking the golf ball.
C. distance the golf ball traveled.
D. type of material used to make the club head.
E. wind direction when the experiment took place.
D. type of material used to make the club head.
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Behavioral responses that animals may or may not use are called facultative
Indicate whether the statement is true or false.
The above figure represents
a. neuromuscular junction. b. muscle fiber. c. transport proteins. d. action potential. e. none of these
Some, but not all, virus capsids are surrounded by
A. either DNA or RNA. B. a protein spore coat. C. both DNA and RNA. D. a protein capsid. E. a membranous envelope.
Experiments with genetically altered mice showed that the mice would consume abnormally high amounts of bitter-tasting compounds in water after their _____
A) hormone receptors for digestive hormones were reduced or eliminated, showing that bitter tastes are reinforced by digestive responses B) salt-taste cells were altered to express receptors for bitter tastants, suggesting that animals have unregulated salt appetites C) visual sense was reduced or eliminated, suggesting that mice learn visual cues about bitter tastes D) sweet-taste cells were altered to express receptors for bitter tastants, suggesting that the sensation of taste depends only on which taste cell is stimulated