7. For an organism to convert enough energy to survive, it needs more than onechlorophyll gathering light. Usually, they are spread out and around the reaction centerand act as an antenna (see figure below). The outer chlorophyll molecules absorb thehighest energy visible light. These chlorophylls pass the energy onto chlorophylls closerto the reaction center that absorb lower energy light, and the process continues untilthe energy reaches the reaction center (see figure below.)Blue-absorbing pigmentsOrange-absorbingpigmentsRed-absorbingpigments=chorophyllReaction=reaction centercenterFigures adapted from BlankenshipAs energy passes from blue-absorbing chlorophylls down to red-absorbing chlorophylls,surprisingly, no energy passes from lower energy-absorbing pigments back to higherones (in other words, the process is irreversible). Why might that be?Energy

* leaves are the sites of absorbing light directly from sun by exposing their leaves. * Chloroplast…

As energy passes from blue-absorbing chlorophylls down to red-absorbing chlorophylls, surprisingly, no energy passes from lower energy-absorbing pigments back to higher ones (in other words, the process is irreversible). Why might that be?

As energy passes from blue-absorbing chlorophylls down to red-absorbing chlorophylls, surprisingly, no energy passes from lower energy-absorbing pigments back to higher ones (in other words, the process is irreversible). Why might that be?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 3VCQ: Figure 8.18 Which of the following statements is true? In photosynthesis, oxygen, carbon dioxide,...

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Concept explainers

Photosynthesis

Plants have a capacity that we humans can only imagine— the ability to produce food from sunlight. Sure, we can prepare some dishes that we can savor on, but it become possible because of the plants (as they serve as a producers of all the raw materials required). Photosynthesis is the method of assembling carbohydrates with the aid of sunlight.

Question

7. For an organism to convert enough energy to survive, it needs more than one
chlorophyll gathering light. Usually, they are spread out and around the reaction center
and act as an antenna (see figure below). The outer chlorophyll molecules absorb the
highest energy visible light. These chlorophylls pass the energy onto chlorophylls closer
to the reaction center that absorb lower energy light, and the process continues until
the energy reaches the reaction center (see figure below.)
Blue-absorbing pigments
Orange-absorbing
pigments
Red-absorbing
pigments
=chorophyll
Reaction
=reaction center
center
Figures adapted from Blankenship
As energy passes from blue-absorbing chlorophylls down to red-absorbing chlorophylls,
surprisingly, no energy passes from lower energy-absorbing pigments back to higher
ones (in other words, the process is irreversible). Why might that be?
Energy

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Which of the following statements is incorrect? a. Pigments absorb light of certain wavelengths only. b. Many accessory pigments are multipurpose molecules. c. Chlorophyll a is green because it absorbs green light.
Where is chlorophyll located in the chloroplast? (a) thylakoid membranes (b) stroma (c) matrix (d) thylakoid lumen (e) between the inner and outer membranes
Figure 8.18 Which of the following statements is true? In photosynthesis, oxygen, carbon dioxide, ATP, and NADPH are reactants. G3P and water are products. In photosynthesis, chlorophyll, water, and carbon dioxide are reactants. G3P and oxygen are products. In photosynthesis, water, carbon dioxide, ATP, and NADPH are reactants. RuBP and oxygen are products. In photosynthesis, water and carbon dioxide are reactants. G3P and oxygen are products.
Absorption Chlorophyll a Chlorophyll s 400 450 500 550 600 650 700 Wavelength (nm) Plant chlorophyll chemicals will absorb, or take in, light wave eniergy in arder to produce ther molecules used for cellular energy. Reflected light refers to those wovelengths of light thet will of the chlorophyll and not be absorbed. Select the conclusion that most accurately summarizes the data in diagram 3. Red and blue light waves have equal importance during photosynthesis. The majority of light energy is attained from red light, while the blue light waves provide additiicn photosynthesis. The majority of light energy is attained from blue light, while the red light waves provide ado photosynthesis. O Medium length light waves are important to photosynthesis
The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different? 400 500 600 700 Wavelength of light (nm) O Green and yellow wavelengths inhibit the absorption of red and blue wavelengths. O Oxygen given off during photosynthesis interferes with the absorption of light. O Other pigments absorb light in addition to chlorophyll a. Absorbance of chlorophyll a Violet Blue Green Yellow Orange Red - Rate of photosynthesis
1. During the light dependent reaction, the molecules within the membrane absorb light energy 2. high energy compounds light dependent portion of photosynthesis 3. an electron which is released by a process called and are produced in the in the thylakoid enters where it is energized and used to convert energy. 4. protons travel through located in the thylakoid membrane in a high energy compound. a process known as 5. The three stages of the light independent reaction are to produce and 6. The most abundant protein on earth is 7. You would need molecules of RuBp in order to create 1 molecule of glucose
Diagram 4: The Light Reactions of Photosymtnes STROMA dow soncentrations Photoeystem PhotoeytmE oomple Light Ligt THYLAKOID SPACE Ohigh concentration) Thylakold membrane ATP wynthase STROMA low H concentration) ADP en from a chloroplast inside of a le the light dependent cyde that take place along the thylakoid membrane a Diagram 4 shows a single thylakoid membrane In photosystem I and II, an electron will O be transferred to ATP be transferred to NADPH lose energy gain energy
In the primary photoevent, what is excited by a photon of light? O The reaction center chlorophyll a molecule Any chlorophyll a molecule Any chlorophyll molecule O Any photosynthetic pigment molecule
Diagram 4: The Light Reactions of Photosynthesis STROMA dow concentralion Photonystem B Cytch e Photosystem Light omplex Light NADP reductoe NADP NADPH THYLAKOID SPACE igh ooncentration) Cavin Cyle Thylakid menbrane ATP STROMA ow H eone sythase ADP ATP Diagram 4 shows a single thylakoid membrane taken from a chloroplast inside of a leaf cell. The events of the light dependent cycle that take place along the thylakoid membrane are shown. Light energy is captured by O ATP synthase O Photosystems I and II O NADP+ reductase The thylakoid membrane's lipid structures Drovious
Chlorophyll a Chlorophyll b 400 450 500 550 600 650 700 Wavelength (nm) Plant chlorophyll chemicals will absorb, or take in, light wove energy in order to produce their own molecules used for cellular energy, Reflected light refers to thase wavelengths of light that will "bou of the chlorophyll and not be obsorbed. A scientist runs an experiment in which only light waves measuring between 490 and 600 nm are hitting the that would explain what would happen based upon the data in the chart. Chlorophyll a would absorb high amounts of light energy, but chloroplyll b would be absorbing low a Neither chlorophyl a nor b would be absorbing very much, if any light energy Chlorophyl b would absorb high amounts of light energy, but chlorophyll a would be absorbing lowa Both chlorophyl a and b would be absorbing high amounts of light. Absorption
10. Observe the graph on the right. If you had a hypothetical plant that only had a hypothetical photopigment with an absorption maximum at 585, which color light would produce the highest rate of photosynthesis? ltra Violet Blue 456-492 nm Green 492677 nm Yellow Orange 597-620 nm Red intra vielet red 400-455 nm 677-697 nm 620-700 nm nm 400 500 600 700 short wtength Ieng vetength high fmuency lawhumcy
4. Complete the Venn diagram below to compare the light-dependent and light- independent reactions. Light-dependent Reactions Cycle) Light-independent Reactions (Calvin