EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 8.1, Problem 3CC
WHAT IF? The Calvin cycle requires ATP and NADPH, products of the light reactions. If a classmate asserted that the light reactions don’t depend on the Calvin cycle and, with continual light, could just keep on producing ATP and NADPH, how would you respond?
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IS THIS A GOOD BREAK DOWN? WHAT ELSE CAN I SHOULD I ADD?
Briefly explain the light-dependent reactions of photosynthesis: where does this take place, what are the reactants and what is produced?
Light-dependent reactions are used to convert light energy into chemical energy for use by the plants. Through the process of photosynthesis, the energy collected from the sun is broken down, along with water molecules, to produce NADPH and ATP.
Light-dependent reactions
Goal
Convert light energy into chemical energy
Location
Chloroplasts—thylakoids
Input
Sunlight, H2O, NADP+, ADP
Output
NADPH, ATP, O2
In photosynthesis,
reaction?
which of the following is NOT true about the light-dependent ("light”)
Light-excited electrons in chlorophyll provide the energy for ATP production
None of the other four answers (All are true of the light-dependent reaction)
The light-dependent reaction converts light energy to chemical energy stored in ATP
The light-dependent reaction (non-cyclic) captures electrons in NADPH
Glucose is synthesized from CO2 and water during the light-dependent reaction
highest rate of photosynthesis?
3. Based on your observations, which wavelength (color) of light might be expected to generate the
General Questions:
1. Why are plants typically green?
2. Photosynthesis produces the oxygen (O2) on which all aerobic organisms depend for survival.
What other factors make photosynthesis essential to the maintenance of virtually all life on
earth?
3. In the experiment that tested the effect of light intensity on the rate of photosynthesis, we did not
run a control tube during the experiment. Why is a control important in an experiment? How
would you design a control for this experiment? Be specific
4. If during the experiment, you found that the control tube generated pressure and had a
measurable rate of "photosynthesis" just like the experimental tube did, what would this fact tell
you about the experiment?
Chapter 8 Solutions
EBK CAMPBELL BIOLOGY IN FOCUS
Ch. 8.1 - How do the reactant molecules of photosynthesis...Ch. 8.1 - How did the use of an oxygen isotope help...Ch. 8.1 - WHAT IF? The Calvin cycle requires ATP and NADPH,...Ch. 8.2 - What color of light is least effective in driving...Ch. 8.2 - In the light reactions, what is the initial...Ch. 8.2 - Prob. 3CCCh. 8.3 - MAKE CONNECTIONS How are the large numbers of ATP...Ch. 8.3 - WHAT IF? Explain why a poison that inhibits an...Ch. 8.3 - Prob. 3CCCh. 8 - The light reactions of photosynthesis supply the...
Ch. 8 - Which of the following sequences correctly...Ch. 8 - How is photosynthesis similar in C4, plants and...Ch. 8 - Which of the following statements is a correct...Ch. 8 - Which of the following does not occur during the...Ch. 8 - In mechanism, photophosphorylation is most similar...Ch. 8 - Prob. 7TYUCh. 8 - To synthesize one glucose molecule, the Calvin...Ch. 8 - SCIENCE, TECHNOLOGY, AND SOCIETY Scientific...Ch. 8 - DRAW IT The following diagram represents an...Ch. 8 - Prob. 11TYUCh. 8 - Prob. 12TYUCh. 8 - FOCUS ON ENERGY AND MATIER Life is solar powered....Ch. 8 - SYNTHESIZE YOUR KNOWLEDGE Watermelon snow in...
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- Р Question 30 With your help, the bus arrives at the starting point for photosynthesis. You look at all the activity here - there's so much going on! Something looks a bit off though. Ms. Frizzle announces to everyone: "Keep your hands inside the bus everyone! I was told this tree has been treated with a chemical that shuts down Photosystem I." That makes sense with what you're seeing, you think. What do you see happening at Photosystem I? Or more to the point, what do you NOT see happening there? D Edit View Insert Format Tools Table 12pt v Paragraph P Р Question 31 The bus donast BIUA 2 T² هی 固v v 固v く く描く To 田 I √xarrow_forwardHello, hope your doing alright! my question is: Photosynthesis contains 2 stages: the light reactions (the "photo" part of photosynthesis) and the Calvin cycle (the "synthesis" part of photosynthesis). Looking only at the light reactions, where do these electrons finally end up at the completion of the light reactions? Where do the replacement electrons come from? Thank you.arrow_forwardPlease help! Photosynthesis and Cell respiration: A. What should happen to the O2 levels in a closed container containing a plant during the day? why? B. And what happens to the O2 levels during the night (no light)? Why?arrow_forward
- Answers can be kept very simple and concise Photosynthesis: A) Is NADPH consumed during the light reactions or Calvin cycle? What is it’s energy used to do? Protons move across the thylakoid membrane in both directions during the light reactions of photosynthesis. B) When protons move in to the thylakoid, are they moving up or down their concentration gradient? (From low to high concentration or from high to low concentration?) C) Since protons are charged, they cannot freely diffuse across a plasma membrane. What protein(s) facilitate the transport of protons in to the thylakoid?arrow_forwardWhat are the stages of the Calvin-Benson cycle? Select all that apply. The resulting unstable six-carbon molecule splits into two three-carbon molecules of PGA. ATP and NADPH are used to convert PGA molecules to PGAL. Most of the PGAL is used to regenerate RuBP, but some is exported to the cytoplasm to produce carbohydrates. Rubisco attaches CO2 to a five-carbon organic compound called RuBP. Rubisco is used to convert PGA molecules to PGAL.arrow_forwardProduces 02 as a by-product [ Choose ] NADPH releases high-energy [ Choose ] electrons NADP+ picks up high-energy [ Choose ] electrons Takes place in the thylakoids of [ Choose ] the chloroplasts ATP is broken apart [ Choose ] Includes the electron transport [ Choose ] chain and the H+ gradient ATP is formed [ Choose ] [ Choose ] Requires an input of CO2 Calvin Cycle (synthesis) Light (photo) Reactions Takes place in the stroma of the [ Choose ] 22arrow_forward
- Another Thought Question! Calculate the gross and net photosynthetic productivity for this whole plant (lear stems & roots) in this experiment. What do you think is happening in this plant regard to the relationship between cellular respiration and photosynthesis, and might a living plant be exhibiting these metabolic characteristics? Light Slope = 10.0 ppm/min %3D Slope = 10.0 ppm/min CO, concentration (ppm) Darkarrow_forwardIf four molecules of carbon dioxide enter the Calvin cycle (four “turns” of the cycle), how many G3P molecules are produced and how many are exported? 4 G3P made, 1 G3P exported 4 G3P made, 2 G3P exported 8 G3P made, 1 G3P exported 8 G3P made, 4 G3P exportedarrow_forwardThe light phase of photosynthesis at the molecular... Photosystem II r QUALI Watch on YouTube Q Search Answer the following questions using the virtual lab light phase video. Where do the electrons for the light reaction come from? How does light cause protons to be pumped? If photosystem 1 (the second photosystem in the chain) is mutated and does not work, will the plant still be able to provide ATP for the Dark reaction? SLO 2 LO M CSU 40 4+ 8 244 9 >11. Share 111 112 +arrow_forward
- Can someone help me understand this. A student set up an experiment to show the effect of light color on photosynthesis in Elodea plants. She filled two test tubes with distilled water and placed a piece of Elodea in each of the tubes. She added a drop of phenol red, which turns red in a basic solution and yellow in an acidic solution. She blew in each tube before placing the volumeters on the top of the tube. Why did she blow into the tube? to add oxygen to the tube to add carbon dioxide to the tube to add carbohydrates to the tube to add sodium bicarbonate to the tubearrow_forwardPlease answer fast Many commercial herbicides act by inhibiting photosynthetic electron transport. They are investigating three herbicides for potential inhibitors of photosynthetic electron transport. a) How can you determine whether these substances have an inhibitory effect on photosynthetic electron transport? How can you quantify the effect? b) An inhibitor has produced a strong effect in "in vitro" tests, but the effect is significantly less in "in vivo" tests. What can be the reason for the reduced effect "in vivo"?arrow_forwardHow do CAM plants prevent photorespiration? Question 32 options: They fix carbon at night and go through the Calvin cycle during the day. They separate carbon fixation and the Calvin cycle into different cells.arrow_forward
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