What is the third trophic level of a food chain?
a. primary consumers
b. tertiary consumers
c. autotrophs
d. secondary consumers
e. primary producers
d
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A scientist is studying a population of feral cats in his city. He notes that the r of this population is 1. What does this mean (assuming that he is evaluating population size on a yearly basis)?
A. that the population of feral cats doubles in size each year B. that the population of feral cats triples in size each year C. that the population of feral cats remains the same size from year to year D. that the population of feral cats decreases in size by 10% every year
What is not a feature of humans that
differentiates us from apes? a. Bipedalism. b. Precision grip. c. Larger brain. d. Little body hair. e. All of these
Some drugs modulate the activity of ion channels. For example, Novocain somewhat inhibits the opening of sodium channels. What happens to the threshold of a sensory neuron if this drug is used?
A) It will take less stimulation to reach threshold. B) The nerve will not function and will die off. C) Threshold will not change. D) It will take more stimulation to reach threshold.
Which of the following chemical groups is not used to construct a DNA molecule?
(a) five-carbon sugar (b) phosphate (c) nitrogen-containing base (d) six-carbon sugar