sample midterm 2

# sample midterm 2 - Question 1 The simplest equation for...

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Question 1 The simplest equation for photosynthesis is: CO 2 + H 2 O [CH 2 O ] + O 2 a) (1pt) In the SECOND HALF of the equation above, underline what is oxidized and circle what is reduced. b) (1pt) Does the oxygen generated by photosynthesis come from CO 2 or H 2 O? d) (1pt)Is O 2 generated in cyclic electron transfer, non-cyclic electron transfer, or both? e)(1pt) How about ATP? f) (3pts) Scientists find plant life on another planet. After studying the plant’s photosynthetic apparatus they discover it works nearly identically to those in plants on earth. The only difference is the wavelengths of light harvested by the photosystems. They call the photosystems of this plant P400 and P420. Based on the names of the 2 photosystems, does this plant capture photons of higher or lower energy than the photosystems of plants on earth? g)(2pts)Placement of the alien plant in the Earth’s atmosphere results in a high amount of photorespiration. What type of adaptation would allow this alien plant to fix carbon in a high oxygen, low CO 2 environment?

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h) (11pts) The diagram below represents an experiment with isolated chloroplasts. The chloroplasts were first made acidic by soaking them in a solution at pH4. After the thylakoid space reached pH 4, the chloroplasts were transferred to a basic solution at pH8. This quickly increased the pH of the stroma to 8, while the thylakoid space remained temporarily at pH 4. A burst of ATP synthesis was observed, and the pH difference between the thylakoid space and the stroma then disappeared a) (5pts)Explain why these conditions lead to ATP synthesis b) (3pts)Is light needed for the experiment to work? Why or Why not? c) (3pts) Will NADPH also be generated in these conditions? Why or why not?
QUESTION 2: We talked about 2 proteins that transport oxygen in the body, Myoglobin and Hemoglobin. Myoglobin Hemoglobin B.(6pts)Draw the reaction curves for O 2 binding to Myoglobin and Hemoglobin A. (3pts)In addition to oxygen , carbon monoxide is also capable of binding to Hemoglobin’s active site, reducing Hemoglobin’s reaction rate for binding to

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## sample midterm 2 - Question 1 The simplest equation for...

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