Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 11, Problem 11.1PS
True or False Indicate whether each of the following statements is true (T) or false (F).
(a) Sucrose is synthesized in the chloroplast stroma and exported from photosynthetic cells to provide energy and reduced carbon for nonphotosynthetic plant cells.
(b) Ninety percent of the solar energy collected by a photosystem complex is absorbed when photons strike a special pair of chlorophyll molecules at the reaction center of the complex.
(c) The energy requirement expressed as ATP consumed per molecule of carbon dioxide fixed is higher for a C3 plant than for a C4 plant.
(d) The ultimate electron donor for the photosynthetic generation of NADPH is always water.
(e) The enzyme rubisco is unusual in that, depending on conditions, it exhibits two different enzymatic activities.
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It is believed that the ratio of cyclic photophosphorylation to noncyclic photophosphorylation changes in response to metabolic demands. In each of the following situations, would you expect the ratio to increase, decrease, or remain unchanged?
(a) Chloroplasts carrying out both the Calvin cycle and the reduction of nitrite (NO2 -) to ammonia (This process does not require ATP.)
(b) Chloroplasts carrying out not only the Calvin cycle but also extensive active transport
(c) Chloroplasts using both the Calvin cycle and the C4 pathway
In photosynthesis, contrast the light reactions with the light independent reactions, in terms of goals, inputs, and outputs of each. Spatially where do they take place (which parts of the chloroplast)? (Optional, for further discussion: Could there be light reactions without light-independent reactions, or visa-versa?)
1.
A) For the schematic of a chloroplast shown in the image attached, match the major input and output molecules of photosynthesis to the letters shown.
Molecules: CO2, H2O, O2, sugar
A:
B:
C:
D:
B) In the image attached, the light reactions are shown to take place in the thylakoid. Where specifically do these reactions take place?
C) Where does the Calvin cycle take place?
Chapter 11 Solutions
Becker's World of the Cell (9th Edition)
Ch. 11 - Both mitochondria and chloroplasts are...Ch. 11 - In the late 1800s, T. W. Engelmann illuminated...Ch. 11 - How do the type and arrangement of the various...Ch. 11 - An essential structural feature in both...Ch. 11 - Prob. 11.4CCCh. 11 - Explain how the Calvin cycle fixes three CO2...Ch. 11 - What are the major regulatory points in the Calvin...Ch. 11 - Although the typical chemical equation for...Ch. 11 - Prob. 11.8CCCh. 11 - True or False Indicate whether each of the...
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