Option+F+Microbes+and+biotechnology

Option F: Microbes and biotechnology toc =Dbq page 316: Thermophiles=

1. Bacteria (according to the diagram on page 315) 2. Strain 2 has a growth rate of app. 1.5 arb. units / day 3. Strain 4 has it's optimum at 55 degrees C at 1.5 arb units/ day and grows at temperatures from 38 to 62 degrees Strain 5 has a lower optimum (0.7 arb units/day) at 63 degrees and grows between 50 and 71 degrees 4. It can live at high temperatures, where it has little competition of other organisms

=Dbq page 318: sewage release into a river= 1. a. Most bacteria live close o the outfall, further away, the number of bacteria decreases b. Close to the outfall, oxygen levels drop, but further away they start rising again c. Close to the outfall, algae levels drop, but further away they rise again. Even further away, the levels drop again. 2. a. Bacteria thrive in low oxygen levels, but decrease in high oxygen levels b. When sewage fungus levels are high, algae levels are low and vice versa. When there are no sewage fungi left, the algae level seems to drop again. c. The more algae, the higher the oxygen level <<<>>>

=Question ? page 318= 1. a. Nitrogen fixing b. Nitrogen fixing c. Nitrification d. Nitrification e. Denitrification

2. a. Poor drainage will lead to water saturated soil, which contains little oxygen. So the //Pseudomonas// will use more nitrate, which will lead to denitrification b. Compacted soil has less oxygen in it, So the //Pseudomonas// will use more nitrate, which will lead to denitrification.

=Dbq page 319: the nitrogen cycle and agriculture= 1. In 1986 2. With around 3 million tonnes in both years it remains constant 3. a. Growing population: more food demand, more use of fertilizer, especially in Asia b. <<>> I have no idea! 4. Denitrification by //Pseudomonas// or //Thiobacillus//