WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
Author: PHELAN
Publisher: MAC HIGHER
expand_more
expand_more
format_list_bulleted
Question
Chapter 5, Problem 5SA
Summary Introduction
To explain: The reason behind oxygen level measurement provides an indication rate of photoreaction and describes how the plant can use carbon dioxide provided by bicarbonate solution, as well as explain how increasing carbon dioxide source affects the rate of photoreaction in plants.
Introduction:
Photosynthesis is a biochemical process in which plants capture light energy and through a series of reactions produce organic energy molecules that later fuel the reactions of fixing atmospheric carbon dioxide and water into organic food molecules.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
A. The C4 plant performs photosynthesis more efficiently than the C3 when the CO2 concentration is 600ppm or less. Provide one reason why the rate of photosynthesis doesn’t change for the C4 plant when the CO2 concentration increases above 400 ppm.
B. Discuss what is happening in the C3 plant when the CO2 levels are below 50 ppm. Provide one reason why this does NOT happen to the C4 plant.
Identify the chemical basis for ApH and AY across the chloroplast
thylakoid membrane by dragging the descriptions to their targets. Be sure
to notice that the upper arrow iindicates ApH and the lower arrow
indicates ΔΨ.
ATP synthase
complex
H+
N
ADP
+ P₁
Light
energy
ATP
H*N
Photosystem I/II-
Chloroplast
N side
Aus
PN
ApH
T
+
Thylakoid
membrane
HTp
H+p
Lumen
Stroma
P side
Proton
circuit
A
B
High H
concentration
Low positive
charge
High positive
charge
Low H+
concentration
Within the image, identify the types of proton translocation by dragging
each label to its target.
O
XH₂
2H+ + Z
2 H*
ZH₂
O
XH₂
Z
2H+
ZH₂ 2H+
C
A
B
Proton pump
Redox loop
We perform our measurements for KHP at 281 nm. Would we get the same results for pathlength at 250 nm? What about using chlorophyll at 667 nm?
Why might a too high concentration of KHP give erroneous data for measuring pathlength?
Chapter 5 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
Knowledge Booster
Similar questions
- In chloroplasts, the light reactions power the creation of ATP via chemiosmosis. In relation to this process, which of the following is true? a) ATP synthase breaks ATP down into ADP, creating energy to fuel chemiosmosis. b) Oxygen is used as a source of electrons to replace those lost in photosystem II. c) Chemiosmosis during the light reactions is also used in the reduction of NADPH and FADH2. d) As excited electrons fall back down to a lower energy state, they create a proton gradient that is used to fuel the phosphorylation of ADP.arrow_forwardDiscuss in detail photorespiration in plants.arrow_forwardExplain why the chlorophylls in light-harvesting complexes must absorb light of shorter wavelength than the light that would directly excite the special pair of PSI or PSII.arrow_forward
- Explain, using a diagram, how during acyclic photophosphorylation (photophase) an electrochemical gradient is produced within reservoirs in the grana of chloroplasts. What is the result?arrow_forwardConsider how the Hill Reaction might be used to investigate how the wavelength of light influences the rate electrons move in the electron transport chain of the chloroplast. a) Design an experiment to compare the effects of blue light and green light on the Hill Reaction. (Assume that you have filters that you can attach to your light source to control the wavelength of light.) b) Based on your knowledge of photosynthesis, how would you expect the color of the light to effect the movement of electrons? c) Draw a line graph of your expected results.arrow_forwardChlorophyll a and chlorophyll b both play roles in photosynthesis. Using no more than one sentence to respond for each segment, please: 1) Outline the roles/functions that chlorophyll b play that are different from those for chlorophyll a 2) Outline the roles/functions that chlorophyll a play that are different from those for chlorophyll barrow_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_forwardIn 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.arrow_forward43) Which of the following is false? A) C3, C4, and CAM plants use the light dependent reactions to harvest energy from the sun and light independent reactions to turn that energy into sugar. B) C3 plants use photorespiration (as opposed to the Calvin Cycle) when CO2 is low ) C4 plants utilize a specialized carbon fixation enzyme and a unique cell structure to reduce the problems of photorespiration D) CẢM plants perform all of the steps of photosynthesis at night to avoid e photorespirationarrow_forward
- 1. A) For the schematic of a chloroplast shown in the image attached, match the major input and output molecules of photosynthesis to the letters shown. Molecules: CO2, H2O, O2, sugar A: B: C: D: B) In the image attached, the light reactions are shown to take place in the thylakoid. Where specifically do these reactions take place? C) Where does the Calvin cycle take place?arrow_forwardIn cyclic photophosphorylation, it is estimated that two electrons must be passed through the cycle to pump enough protons to generate one ATP. Assuming that the ΔG for hydrolysis of ATP under conditions existing in the chloroplast is about -50 kJ/mol, what is the corresponding percent efficiency of cyclic photophosphorylation, using light of 700 nm?arrow_forward2.) A.) Explain how electron transfer leads to ATP biosynthesis in the light reactions of photosynthesis. You must give details about how electron flow builds a pH gradient and a description of the compartments in the chloroplast in relation to pH. Also, compare the ETC of the mitochondrion with the ETC of the light reactions for both the source and destination for electrons. B.) Would ATP biosynthesis happen if ionophores, which would create holes in the thylakoid membrane and allow uncontrolled passage of charged molecules such as protons between compartments, are provided to the chloroplast? Why or why not? C.) How would you modify Complex I of the electron transport chain to decrease ATP yield from Step 3 of β-oxidation? As part of this, you must explain why there is a difference in ATP yield between NADH and FADH 2 AND give a specific change to the ETC that would decrease ATP yield from Step 3arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you