Which of the following statements regarding red tides is incorrect?
A. Red tides are also known as harmful algal blooms (HABs).
B. Red tides result from an overgrowth of dinoflagellates.
C. Toxins produced by dinoflagellates are skin irritants.
D. Dinoflagellates produce a toxin that causes paralytic shellfish poisoning.
Answer: C
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Five unknown compounds are added to water. Four of the compounds go into solution while one does not. What property does water possess that allows these four compounds to dissolve? Why might the fifth compound not dissolve?
A. The positive and negative charge in water will dissolve many substances; the substance is not structurally similar to water. B. The negative charge of water dissolves many substances; the substance is too structurally similar to water. C. The positive charge of water dissolves many substances; the substance is too structurally similar to water. D. The nonpolar quality of water dissolves many substances; the substance is not structurally similar to water.
Oceanography is the study of:
a. the living organisms that inhabit the sea. b. the oceans and their phenomena. c. the oceans and living organisms. d. the chemical makeup of the oceans. e. the interactions of marine organisms with their environment.
One important adaptation of mammals is hair growing out of the skin for retaining heat. How does hair help mammals retain heat?
a. Hair increases the surface area exposed to the sun, capturing more heat from the environment. b. Hair covers the body like a coat, keeping out the cold and stopping evaporative cooling. c. Hair traps a boundary layer of air close to the body, retaining heat generated by metabolic processes. d. Hair’s dark color captures more light, and light is energy, allowing mammals to capture energy to heat the body.
African lungfish, which are often found in small, stagnant pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation?
A) Urea takes less energy to synthesize than ammonia. B) Small, stagnant pools do not provide enough water to dilute the toxic ammonia. C) The highly toxic urea makes the pool uninhabitable to potential competitors. D) Urea makes lungfish tissue hypoosmotic to the pool.