Exam 10: Photosynthesis

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?

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

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

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

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

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

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?

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?

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

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

Where are ATP synthase complexes located in plant cells?

Which process is most directly driven by light energy?

Which of the following processes occurs during the Calvin cycle?

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?

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

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?

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. Trial Grams of baking soda source Wattage of light bulb Disks floating at 10 minutes 1 0.5 25 3 2 0.5 50 5 3 0.5 75 9 4 0 75 0 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.