Biological magnification is best defined as ____
a. the increase in toxicity of a chemical compound resulting from its metabolism by a living organism
b. the higher relative proportion of biomass among producers as compared to consumers in an ecosystem
c. the concentration of nondegradable poisons within organisms at higher trophic levels
d. the concentration of degradable poisons within organisms at lower trophic levels
e. the declining relative proportion of nondegradable poisons in organisms at higher trophic levels as compared
to those at lower trophic levels
ANSWER: c
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You observe two groups of freshwater fish that spawn at the same time of the year and in the same pond. After females lay their eggs on the pond bottom, males of both species attempt to fertilize them
After some investigation you realize that sperm from both species fertilize the eggs, but embryonic development stops shortly after fertilization when the eggs are fertilized by one species of males, but not by the other. This is an example of ______-zygotic reproductive isolation between the two species. A. pre B. post
Which of the following contain enzymes and
are the main organelles of waste disposal?
a. Golgi bodies b. mitochondria c. lysosomes d. ribosomes e. endoplasmic reticulum
The total number of different three-base combinations of the four nucleic acid bases is:
a. 12. b. 16. c. 20. d. 64. e. 256.
Antigen-presenting cells include
A. dendritic cells and macrophages. B. dendritic cells and B cells. C. macrophages and B cells. D. macrophages, B cells and dendritic cells. E. macrophages.