The best definition of population density is:
a. the number of individuals of all species in a given area.
b. the number of individuals of one species in a given area.
c. the number of individuals in a given area at a given time.
d. the number of individuals of all species in a given area at a given time.
e. the number of individuals of one species in a given area at a given time.
E
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The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____
A) gains electrons and gains potential energy B) loses electrons and loses potential energy C) gains electrons and loses potential energy D) loses electrons and gains potential energy
Which of the tools below is used to cut the gene from its normal location?
A. restriction enzyme B. plasmid C. bacteriophage D. vector
A group of ants escaped from a picnic basket carried to the top of a mountain and thrived in this area where there were no other ants. Many years later descendants of these ants crawled into a picnic basket on the mountain and traveled back to the valley
from which their ancestors had come. Which of these observations would cause you to conclude that the ants on top of the mountain had become a different species from those in the valley? A) The mountain ants and valley ants were different colors. B) The mountain ants and valley ants were different sizes. C) The mountain ants ate different food than the valley ants. D) The mountain ants could not mate with the valley ants.
Which of the following statements is true?
A) Sister chromatid exchange would lead to a reshuffling of alleles. B) Exchanges occur between homologous chromosomes, but never between sister chromatids. C) Crossing over has a cytological basis. D) Sister chromatid exchange would mutate one strand of DNA. E) Harlequin chromosomes are a result of homologous recombination.