Bio chapter 10 photosynthesis

A gardener is concerned that her greenhouse is getting too hot from too much light and seeks to shade her plants with colored translucent plastic sheets, the color of which allows passage of only that wavelength. What color should she use to reduce overall light energy but still maximize plant growth?
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A gardener is concerned that her greenhouse is getting too hot from too much light and seeks to shade her plants with colored translucent plastic sheets, the color of which allows passage of only that wavelength. What color should she use to reduce overall light energy but still maximize plant growth?
blue
In mitochondria, an electron transport chain pumps protons from the matrix into the intermembrane space, whereas in chloroplasts, an electron transport chain pumps protons from the ________.
stroma to the thylakoid space
Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light. What did Engelmann conclude about the congregation of bacteria in the red and blue areas?
Bacteria congregated in these areas because these areas had the most oxygen being released.
In which of the following organisms did the process of photosynthesis most likely originate?
in prokaryotes
Which of the following events accompanies absorption of energy by chlorophyll molecules of the reaction-center complex?
An electron is excited.
What wavelength of light in the figure is most effective in driving photosynthesis?
420 nm
Image: What wavelength of light in the figure is most effective in driving photosynthesis?
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?
Paper chromatography would separate the pigments into several bands that appear green or yellow/orange.
The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?
Other pigments absorb light in addition to chlorophyll a.
Image: The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?
In a plant, which of the following reactions produce molecular oxygen (O2)?
the light reactions alone
In mechanism, photophosphorylation is most similar to
oxidative phosphorylation in cellular respiration.
What would be the expected effect on plants if the atmospheric CO2 concentration was doubled?C3 plants would have faster growth rates; C4 plants would be minimally affected.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?a mixture of blue and red lightWhat are the products of linear electron flow during the light reactions of photosynthesis?ATP and NADPHUnder what conditions do photosynthesis and cellular respiration occur in plants?Photosynthesis occurs only in the light, and cellular respiration occurs in both the dark and the light.What happens to the free energy released as electrons are passed from photosystem II to photosystem I through a series of electron carriers?It is used to establish and maintain a proton gradient.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?regeneration of RuBPWhy are the reaction centers of photosystems composed of several structurally different pigments?This arrangement enables the plant to absorb light energy of a variety of wavelengths.Which of the following statements correctly describes a distinction between autotrophs and heterotrophs?Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.A flask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights that is set to cycle between 12 hours of light and 12 hours of dark. The dissolved oxygen concentrations in both flasks are monitored. Predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask. The dissolved oxygen in the flask with algae will ________.be higher in the light, but lower in the darkSome photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. Which of the following approaches would be the best way to detect the lack of photosystem II in these organisms?Determine whether they produce O2 in the light.This answer is correct.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 (CO2 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.Cup 4 had the lowest rate of photosynthesis because it had the least CO2.Which of the following statements best describes the relationship between photosynthesis and cellular respiration?Photosynthesis stores energy in complex organic molecules; cellular respiration releases energy from complex organic molecules.Which of the following molecules are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?ATP and NADPHTheodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light. Which of the following statements describes a relationship that Engelmann's experiment helped to determine?the relationship between wavelength of light and the rate of photosynthesisCompared to C3 plants, C4 plants ________.can continue to fix CO2 even at lower CO2 concentrations and higher oxygen concentrationsWhich of the following processes is most directly driven by light energy?removal of electrons from chlorophyll moleculesWhich of the following processes would be most directly affected if a thylakoid membrane is punctured so that the interior of the thylakoid is no longer separated from the stroma?synthesis of ATPIn autumn, chlorophyll is degraded in the leaves of deciduous trees. Why do the leaves change color to shades of yellow, orange, or red?Other pigments such as carotenoids are still present in the leaves.Where in a plant cell does the Calvin cycle take place?stroma of the chloroplastIn photosynthetic cells, synthesis of ATP by chemiosmosis occurs during ________.photosynthesis and respiration