Review Quiz #9

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Review Quiz #9

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Question 1

Question 1 *

The diagram above shows energy changes in a specific chemical reaction with and without the addition of an enzyme to the reaction.Which of the following questions can best be answered by the diagram?

(A) Does the addition of an enzyme reduce the activation energy required for a reaction?

(B) Does the addition of an enzyme result in the formation of covalent bonds?

(D) Does the addition of an enzyme change the pathway for the reaction?

Question 2 *

Two nutrient solutions are maintained at the same pH. Actively respiring mitochondria are isolated and placed into each of the two solutions. Oxygen gas is bubbled into one solution. The other solution is depleted of available oxygen. Which of the following best explains why ATP production is greater in the tube with oxygen than in the tube without oxygen?

(A) The rate of proton pumping across the inner mitochondrial membrane is lower in the sample without oxygen.

(B) Electron transport is reduced in the absence of a plasma membrane.

(D) In the presence of oxygen, glycolysis produces more ATP than in the absence of oxygen.

Question 3

Question 3 *

As part of a study to observe the activity of photosynthetic organisms in a temperate-zone lake, measurements of light penetration were made at different water depths. The results are presented in the graph below. Note that higher light- penetration values indicate a greater amount of light reaching the water at that depth.According to the data above, what is the deepest water level at which light penetration is expected to be at least 200 μEin m-2 s-1? Give your answer to the nearest tenth of a meter.

Question 4 *

To test the hypothesis that a particular plant synthesizes storage lipids by using glyceraldehyde 3-phosphate (G3P) from photosynthesis, a researcher plans to use radio-labeled precursors to track the molecules through the biosynthetic pathway. Which of the following radio-labeled precursors is most appropriate for the researcher to use?

(A) 15N-labeled N2, because atmospheric nitrogen is fixed to amino acids by photosynthesis

(B) 14C-labeled CO2, because atmospheric carbon is fixed to carbohydrates by photosynthesis

(D) 32P-labeled phosphate, because lipids are stored in plants as phospholipids

Question 5

Question 5 *

Based on the information provided, what was the change (in oC) in water temperature associated with the change in respiration rate shown in Figure 2 ? Give your answer to one decimal place.

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