EBK BIOLOGY
11th Edition
ISBN: 8220101459800
Author: Byers
Publisher: PEARSON
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Chapter 7, Problem 3AC
Assume you want to add an accessory pigment to the photosystems of a plant chloroplast to help it photosynthesize more efficiently. What wavelengths of light would the new pigment absorb? Describe the color of your new pigment. Would this be a useful project for genetic engineers?
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Students have asked these similar questions
In the photosynthesis lab, a group of students found that in the blue light condition, there was a change in absorbance (ΔA620) of 0.324 in extracted spinach chloroplasts. The students later went on a hike and located a plant they had never seen before and were interested in how the photosynthesis rates would compare to their experiment with spinach chloroplasts. They extracted chloroplasts of the unknown green-leaved plant and exposed them to the same experimental conditions as before. The students calculated the ΔA620 to be 0.100.
Which plant (spinach or unknown) has the highest rate of photosynthesis? Explain your answer using evidence, being sure to demonstrate your understanding of the dependent variable.
Let’s say you have just been hired by a biotechnology company that develops herbicides that are used to kill invasive plants. Before you start, you must research current herbicides and determine how exactly they kill the plants.
Choose an herbicide from the list and describe how it kills the plants it is used on. Each of the herbicides disrupts photosynthesis, explain which part of photosynthesis the herbicide disrupts and how it does so. Herbicides to choose from Atrazine, Clomazone, Paraquat.
A group of scientists wants to test the effect of different wavelengths of light on plant photosynthesis. They have 3 treatment groups: red light, green light, and no light. They choose red light because
chlorophyll has been shown to absorb red light. They choose green light because chlorophyll has been shown to reflect green light. They choose no light as a negative control to examine the rate of
photosynthesis in the absence of light. To measure photosynthetic rate, the scientists use sensors to measure oxygen production of plants exposed to the different light treatments.
Choose the best scientific hypothesis:
O Photosynthesis is a critical process for plants, and it is of great importance that we understand how it is impacted by different wavelengths of light.
O If rate of oxygen production is higher under red light than it is under green light or no light, it proves that red light has the largest effect on photosynthesis.
O Because chlorophyll absorbs red light, rate of oxygen…
Chapter 7 Solutions
EBK BIOLOGY
Ch. 7 - Which of the following is True? a. Photosynthesis...Ch. 7 - The Calvin cycle a. can only occur when light is...Ch. 7 - Prob. 3MCCh. 7 - Carotenoids a. include chlorophylls a and b. b....Ch. 7 - Prob. 5MCCh. 7 - Plant leaves contain pores called _____ that allow...Ch. 7 - Chlorophyll a captures wavelengths of light that...Ch. 7 - 3. During the first stage of photosynthesis, light...Ch. 7 - The oxygen produced as a by-product of...Ch. 7 - 5. In plants, the enzyme that catalyzes carbon...
Ch. 7 - Light reactions generate the energy-carrier...Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - 3. Draw a simplified diagram of a leaf...Ch. 7 -
4. Draw a simplified diagram of a chloroplast and...Ch. 7 - Explain photorespiration and why it occurs....Ch. 7 - Trace the flow of energy in chloroplasts from...Ch. 7 - 7. Summarize the events of the Calvin cycle. Where...Ch. 7 - Suppose an experiment is performed in which plant...Ch. 7 - If you were to measure the pH in the space...Ch. 7 - 3. Assume you want to add an accessory pigment to...
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- There are two photosystems involved in the light reaction of photosynthesis. Both take upenergy from the sun in the form of light.A. Where are the photosystems located and what is the name of the organelle? B. Where does the energy that the photosystems take up, go? Describe for eachphotosystem WHERE the energy ends up at the end of the light reactions. In otherwords, what products contain the energy from which photosystem at the end ofthe light reaction?arrow_forwardYou recently join a lab where professor is looking for photosystem of plants. He told you to isolate chloroplast and look for the photosystem II. Please select the correct sequence of events you are going to perform. options: Homogenize leaves à differential centrifugation à Fractional Solubilization à Affinity purification Homogenize leaves à Fractional Solubilization à differential centrifugation à Affinity purification Differential centrifugation à Homogenize leaves à Fractional Solubilization à Affinity purification Affinity purification à differential centrifugation à Fractional Solubilization à Homogenize leavesarrow_forwardIf I wanted to maximize the rate of photosynthesis in plants, should I expose them on Low Light or moderate?arrow_forward
- For most plants, two distinct photosystems (Photosystem I and Photosystem II) work together in series during photosynthesis. These photosystems are complexes of proteins and pigment molecules. Statement 1: Photosystem I has an absorption maximum of 680 nm, whereas Photosystem II has an absorption maximum of 700 nm. Statement 2: The special pair of chlorophyll a molecules in the reaction center of photosystem I is designated as P700, whereas the special pair of chlorophyll a molecules in the reaction center of photosystem II is designated as P680. Statement 1 is true. Statement 2 is false. Statement 1 is false. Statement 2 is true. Both statements are true. Both statements are false.arrow_forwardIdentify which of the following statements is a lie? Select one: a. Even if plants have red leaves, they still perform photosynthesis. b. Photosynthesis is vital in plants to produce food and energy they need for growth and cellular respiration. Therefore, all plants need the same amount of sunlight to make enough food to grow. c. Aside from chlorophyll α and chlorophyll b in plants, plants also have carotenoids, which help plants absorb light energy for use in photosynthesis.arrow_forwardIf you are planning an experiment to show the effect of light on photosynthesis (i) Will you select white light or green light? Justify your answer. (ii) Why would you select a destarched plant.arrow_forward
- visit: https://www.youtube.com/watch?v=EMNFZnDt75c Attempt to identify the single cup-shaped chloroplast containing the eyespot for phototaxis (phototaxis: moving toward or away from light). This will be a different color than the rest of the cell. What color is it?arrow_forwardAn experiment was done to determine how color of light and distance affects photosynthetic activity of the pond weed. Pond weed was placed in a test tube containing a solution of sodium hydrogen carbonate, and had its end cut; light was placed 50 cm away and four colors were tested (clear, red, blue, and green). After placing the light, the pondweed was given a certain amount of time to adjust before counting the bubbles, bubbles were counted for 1, 3, and 5 minutes. Only the bubbles that came out of the cut end was counted to represent the rate of photosynthesis. Below is the tabulated results. What are the possible factors or errors that could have affected clear/white light to have lower photosynthetic activity? In theory this should have the highest rate.arrow_forwardIn 1770, Joseph Priestley performed a series of experiments to determine the reactants and products of photosynthesis. The diagram below shows the experimental conditions and results of two experiments performed by Priestley, named here as Experiment 1 and Experiment 2. From his experiments, Priestley concluded that plants restore to the air whatever breathing animals and candles remove. Joseph Priestly Photosynthesis Experiments and Results Experiment Results: - candle extinguished (went out) 1 - mouse died Experiment 2 Results: candle continued to burn mouse stayed alive Note: Experiment 1 and Experiment 2 were both performed in the presence of sunlight. The substance produced by the plant in Experiment 2, that keeps the candle burning and the mouse alive is O CO2 O 02 O H2O O C6H1206arrow_forward
- If you landed on a planet where all of the plants had purple leaves, what wavelengths of light would you expect to be least effective for photosynthesis? explain your reasoning.arrow_forwardGreen colors in plants are produced by the presence of: Pigments called chlorophylls a and b located in the chloroplasts. Pigments called chlorophylls a and b located in cell vacuoles. Pigments called carotenoids located in the chloroplasts. Pigments called anthocyanins located in cell vacuoles.arrow_forwardName that part of chloroplast where the light reaction of photosynthesis take place.arrow_forward
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