________ tend to be more toxic than ________
a. Aromatic compounds; chlorofluorocarbons
b. Aliphatic compounds; aromatic compounds
c. Aliphatic compounds; refined petroleum products
d. Aromatic compounds; aliphatic compounds
d
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Almost all plasmids are double-stranded DNA
Indicate whether the statement is true or false.
Treatment of plants with fungicides may result in a phosphorus deficiency. What is the most likely explanation for this observation?
A. Phosphorus transporters in the plasma membrane of the plant cells are destroyed. B. Plant cell walls impede the uptake of phosphorus after fungicide has been sprayed to limit the amount of fungicide that enters the plant. C. ATP synthesis is blocked, so phosphorus cannot be absorbed into plant cells. D. Nitrogen fixation is inhibited. E. Mycorrhizal symbionts are destroyed by the fungicide.
Starting from the outside and moving in toward the center, which list gives the correct order of tissues in the stem of a
young tree?
a. secondary phloem, primary phloem, primary xylem, secondary xylem b. primary xylem, secondary xylem, secondary phloem, primary phloem c. primary phloem, secondary xylem, secondary phloem, primary xylem d. secondary phloem, primary xylem, secondary xylem, primary phloem e. primary phloem, secondary phloem, secondary xylem, primary xylem
What change would increase the rate of oxygen diffusing from lung alveoli into the blood?
A. A decrease in the pH of the blood entering the lungs B. An increase in the hemoglobin concentration of the red blood cells C. An increase in the partial pressure of oxygen in the blood entering the lungs D. An increase in the humidity of air in the lungs E. A decrease in the partial pressure of oxygen in the alveoli Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about diffusion? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?