Which of the following is a theory?
A) A boy finds a chipped rock he believes is an arrowhead.
B) Many people claim that the Earth is only 6,000 years old.
C) There is molecular and biochemical evidence that all organisms are related.
D) Many people believe echinacea cures their colds.
Answer: C
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Which of the following is the light-absorbing compound used by photoreceptors?
A. opsin B. retinal C. rhodopsin D. both opsin and retinal
The primary consumer is
a. the second link in a food chain. b. an herbivore. c. an animal. d. eaten by a carnivore. e. all of these.
To increase the surface area of some cells, the plasma membrane possesses
A) receptors. B) flagella. C) microvilli. D) transport proteins.
At a constant temperature and pH, the rate of an enzymatically catalyzed reaction is inversely proportional to the
enzyme concentration. __________________ Indicate whether the statement is true or false.