The cytochrome P450 constitute a superfamily of heme-containing enzymes that occur in nearly all living organisms, from bacteria to mammals, These monooxygenases, which in animals are embedded in the endoplasmic reticulum membrane, catalyze reactions of the sort

                  RH + O₂ + 2 H⁺ + 2e⁻ → ROH + H₂O 

The electrons (e−) are supplied by NADPH, which passes them to cytochrome P450’s heme prosthetic group via the intermediacy of the enzyme NADPH P450 reductase. Here RH represents a wide variety of usually lipophilic compounds for which the different cytochromes P450 are specific. They include

a. polycyclic aromatic hydrocarbons 

b. polycyclic biphenyls

c. frequently carcinogenic compounds that are present in tobacco smoke, broiled meats, and other pyrolysis products

d. which were widely used in electrical insulators and as plasticizers and are also carcinogenic.

#Question id: 9162

#Unit 9. Diversity of Life Forms

If the direction of Earth's rotation reversed, the most predictable effect would be ________.

#Question id: 9163

#Unit 9. Diversity of Life Forms

Use the following figures to answer the question below

Based on the data in the figures, which of the following statements are correct?

I) Area 1 would be considered a desert because of its high average temperature.

II) Area 1 has more average precipitation than Area 2.

III) Area 2 would be considered a desert because of its low average precipitation.

IV) Area 2 has a larger annual temperature variation.

#Question id: 9164

#Unit 9. Diversity of Life Forms

Use the following figures to answer the question below.

East of the Mississippi River, in Hopkinsville Kentucky, the mean annual precipitation is 130 cm. The mean annual temperature is 14.3°C. In the winter, the mean temperature is 7.3°C, while in summer it is 20.6°C. Using the climograph shown here, how would we classify the biome found in Hopkinsville?

#Question id: 9165

#Unit 9. Diversity of Life Forms

Which of the following biomes spans the largest annual mean temperature range, but the narrowest mean precipitation range?

#Question id: 9166

#Unit 9. Diversity of Life Forms

If global warming continues at its present rate, which biomes will likely take the place of the coniferous forest (taiga)?

#Question id: 9167

#Unit 9. Diversity of Life Forms

If you conclude that vegetation at every point on Earth exactly resembles the predicted biome distribution in a climograph, then ________.