For each of the questions or incomplete statements below (#1-15), select the answer choice that is best in each case. Fill in the corresponding lettered space on your scantron.
1. In the 1980’s satellite measurement of ozone concentration in the upper atmosphere over Antarctica revealed the environmental damage caused by use of A. lead in the lining of pipes. B. growth hormone on cattle. C. certain chemicals in refrigerants. D. plutonium to manufacture nuclear weapons. 2. In examining a picture of a cell taken with an electron microscope, a student observes that the cell has a nucleus and a cell membrane, but not a cell wall. The student can correctly conclude that the cell probably comes from A. a moss. B. a fungus. C. a bacterium. D. an animal. 3. A chemical interferes with a cell’s ability to make proteins. Investigations reveal that the cell parts responsible for making proteins are in working order. The cell can also encode instructions for making proteins, but those instructions are not being carried out. The chemical appears to affect the communication between the A. cell wall and nucleus. B. nucleus and ribosomes. C. mitochondria and chloroplasts. D. endoplasmic reticulum and lysosomes. 4. An ecologist obtains a water sample from a possibly polluted river. Which form of pollution could be searched for by examining slides of the water under a compound microscope? A. bacteria B. acid rain C. heavy metals D. dissolved riverbank minerals * Plants provide the entry point for energy into an ecosystem. How is this illustrated in a food pyramid? A. Plants are shown at the top of the pyramid. B. Plants always have the greatest overall bio-mass. C. Plants are located in the middle of the pyramid D. Plants have the smallest number of organisms.9. How does DNA change from generation to generation in asexual organisms? A. cloning B. mutation C. variation D. gene