Answer the following statements true (T) or false (F)
1. Plant cell membranes contain cholesterol.
2. Diffusion is the movement of a molecule from an area of high to low concentration.
3. Osmosis describes the movement of water from an area of high to low solute concentration.
4. Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
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An example of a cyclical disease is
A) diphtheria. B) smallpox. C) influenza. D) anthrax.
Phloem does not transport ____
a. carbohydrates b. hormones c. amino acids d. fatty acids e. nitrate
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
Detritivores are
a. bacteria. b. plants. c. fungi. d. animals. e. both bacteria and fungi.