Which of the following is NOT true of ecosystems?
a. Although they may include many different species, many features of ecosystem structure
and function are alike.
b. Autotrophs secure energy and nutrients that are then used by heterotrophs.
c. Energy cycles and minerals flow through ecosystems.
d. Many different niches are represented in most ecosystems.
e. Ecosystems are characterized by relatively few trophic levels.
C
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Hydroponic culture is the process of
a. growing plants in pure water mixed with carefully measured amounts of specific minerals. b. irrigation of dry areas to improve mineral absorption by plants. c. growing plants in ponds and lakes to improve their access to water, allowing the plants to place more resources into the shoot system. d. irrigation of dry areas to prevent crop plants from wilting. e. growing plants with specific hydrocarbons added to the soil to test the effect on plant growth.
Amoebic dysentery is caused by
a. Ulva. b. Volvox. c. a desmid. d. Entamoeba.
The type of movement that is specific and requires carrier molecules and energy is
A. active transport. B. exocytosis. C. facilitated diffusion. D. osmosis. E. endocytosis.
An athletic friend of yours recently had a blood test, asked for a copy of the report, and looked up numbers for his "total cholesterol," or combined LDL/HDL numbers. An online source lists his total as slightly high. He says, "My doctor's a quack! He
told me my cholesterol was fine!" You press your friend for more details and come to understand that his LDL levels are within the healthy range, but his HDL levels are higher than average. What do you say to your friend to help him understand his doctor's comments? What will be an ideal response?