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Exam 10: Photosynthesis

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Question 31

Multiple Choice

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Which of the following processes occurs during the Calvin cycle?

A) reduction of NADPH
B) release of oxygen
C) regeneration of the CO₂ acceptor
D) production of ATP

E) B) and D)
F) A) and B)

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Question 32

Multiple Choice

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In a plant, which of the following reactions produce molecular oxygen (O₂) ?

A) the light reactions alone
B) the Calvin cycle alone
C) the light reactions and the Calvin cycle
D) neither the light reactions nor the Calvin cycle

E) B) and D)
F) All of the above

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Question 33

Multiple Choice

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What are the products of linear electron flow during the light reactions of photosynthesis?

CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they ________.

Use the following figure to answer the question. What wavelength of light in the figure is most effective in driving photosynthesis?

In the initial step in carbon fixation, a molecule of CO₂ is attached to RuBP to produce a six-carbon molecule, which is immediately split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces glyceraldehyde 3-phosphate (G3P) , what more needs to occur to complete the Calvin cycle?

In which of the following organisms did the process of photosynthesis most likely originate?

Which of the following processes is most directly driven by light energy?

Which process is most directly driven by light energy?

What is the relationship between the wavelength of light and the quantity of energy per photon?

Use the following figure to answer the question. The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Paper chromatography is a technique used to separate molecules based upon their size and solubility in a particular solvent. If pigments from a particular species of plant are extracted and subjected to paper chromatography, which of the following results is most likely?

What would be a likely consequence of a mutation in plants that results in a photorespiration deficiency?

Students conducted an experiment to determine the effect of light intensity on the rate of photosynthesis. They punched 40 leaf disks from spinach leaves and used a syringe partially filled with water to pull the gases from the leaf disks so that all leaf disks sunk to the bottom of the syringe. Ten leaf disks from the syringe were placed in each of four cups and covered with 50 ml of the solutions as indicated below. All leaf disks were resting on the bottom of the cups when the experiment began. The volume of liquid in each cup and the temperature of the solutions were held constant. All cups were placed 0.5 meters from the designated light source. A large beaker of water was placed between the light and the cups to act as a heat sink to prevent a change in temperature. At the end of 10 minutes, the number of disks floating in each cup was recorded. $\begin{array} { | c | c | c | c | } \hline \text { Trial } & \begin{array} { c } \text { Grams of } \\\text { baking soda } \\\left( \mathrm { CO } _ { 2 } \text { source } \right) \end{array} & \begin{array} { c } \text { Wattage of } \\\text { light bulb }\end{array} & \begin{array} { c } \text { Disks floating } \\\text { at } 10 \text { minutes }\end{array} \\\hline 1 & 0.5 & 25 & 3 \\\hline 2 & 0.5 & 50 & 5 \\\hline 3 & 0.5 & 75 & 9 \\\hline 4 & 0 & 75 & 0 \\\hline\end{array}$ Use your knowledge of the mechanism of photosynthesis and the data presented in the chart to determine which of the statements is a correct explanation for the students' data.

Use the following figure to answer the question. Refer to the accompanying figure and the molecules labeled A, B, C, D, and E. If the carbon atom of each of the incoming CO₂ molecules is labeled with a radioactive isotope of carbon, which organic molecules will be radioactively labeled after one cycle?

Why are C₄ plants able to photosynthesize with no apparent photorespiration?

Carbon dioxide is split to form oxygen gas and carbon compounds in which of the following metabolic pathways?

A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Since the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed. What wavelengths of light should be used to maximize plant growth with a minimum of energy expenditure?

Where are ATP synthase complexes located in plant cells?

Which of the following statements correctly describes a distinction between autotrophs and heterotrophs?