Review Chapter 10: Photosynthesis
Accessory pigments within chloroplasts are responsible for a. driving the splitting of water molecules b. absorbing photons of different wavelengths of light c. providing electrons to the reaction center chlorophyll after electrons pass to NADP+ d. pumping H+create a proton gradient across the thylakoid membrane e. anchoring chlorophyll a within the reaction center
absorbing photons of different wavelengths of light
In C4 cells, the calvin cycle takes place in
Bundle-sheath cells
p700
Photosystem I
The splitting of water takes place in the
Thylakoid space
What three factors contribute to the formation of this large difference in H+ concentration between the thylakoid space and the stroma?
1. pumping of H+ into the thylakoid space 2. H+ produced from the splitting of water 3. Decrease in H+ as they are added to NADP+ in the stroma
How many "turns" of the Calvin cycle are required to produce one molecule of glucose? a. 1 b. 2 c. 3 d. 6 e. 12
6
Noncyclic electron flow along with chemiosmosis in the chloroplast results in the production of a. ATP only b. ATP and NADPH c. ATP and G3P d. ATP and O2 e. ATP, NADPH and O2
ATP and NADPH
Which of the following is mismatched with its location? a. light reactions - grana b. electron transport chain - thylakoid membrane c. Calvin cycle - stroma d. ATP synthase - double membrane surrounding chloroplast e. Splitting of water - thylakoid space
ATP synthase - double membrane surrounding chloroplast
Chloroplasts can make carbohydrate in the dark if provided with a. ATP, NADPH and CO2 b. an artifically induced proton gradient c. organic acids or four carbon compounds d. a source of hydrogen e. photons and CO2
ATP, NADPH and CO2
The chlorophyll known as p680 has its electron "holes" filled by
Water
Photosynthesis is a redox process in which a. CO2 is reduced and water is oxidized b. NADP+ c. CO2, NADP+ d. O2 acts as an oxidizing agent and water acts as a reducing agent e. G3P is reduced and the electron transport chain is oxidized is reduced and RuBP is oxidized, and water are reduced
CO2 is reduced and water is oxidized
Location of light reactions
Grana
What are the final electron acceptors for the electron transport chains in the light reactions of photosynthesis and in cellular respiration? a. O2 in both b. CO2 in both c. H2O in the light reactions and O2 in respiration. d. P700 and NADP+ in respiration e. NADP+ in the light reactions and O2 in respiration in the light reactions and NAD+ or FAD
NADP+ in the light reactions and O2 in respiration in the light reactions and NAD+ or FAD
The main products of the light reactions of photosynthesis are a. NADPH and FADH2 b. NADPH and ATP c. ATP and FADH2 d. ATP and CO2 e. ATP and H2O
NADPH and ATP
How does cyclic electron flow differ from noncyclic electron flow? a. No NADPH is produced by cyclic electron flow. b. No O2 is produced by cyclic electron flow. c. The cytochrome complex in the electron transport chain is not involved in cyclic electron flow. d. Both a and b are correct. e. a, b and c are correct
No NADPH is produced by cyclic electron flow.
p680
Photosystem II
Location of the ETC
Thylakoid membrane
Location of the Calvin Cycle
Stroma
Why are absorption and action spectrum lines different?
The action spectra takes into account ALL the pigments in the plant. The absorption spectra is for each individual pigment.
Describe the components of a photosystem.
The photosystem is made of the light harvesting complex - pigments - and the reaction center. The reaction center contains the "special chlorophyll" molecules which will receive all the solar energy absorbed by the photosystem. All of this energy will cause electrons within the "special chlorophyll" molecules to become excited. The excited electrons are lost to the primary electron acceptor, also within the reaction center.
In the light, the proton (H+) gradient across the thylakoid membrane is as great as 3 pH units. On which side is the pH lowest?
The thylakoid space will have a lower pH (more acidic) when there is a high concentration of H+ present.
Location of ATP synthase
Thylakoid membrane
What does ribisco do? a. reduces CO2 to G3P b. regenerates RuBP with the aid of ATP c. combines electrons and H+ to reduce NADP+ to NADPH d. adds CO2 to RuBP in the carbon fixation stage e. transfers electrons from NADPH to 1,3 bisphosphoglycerate to prodcue G3P
adds CO2 to RuBP in the carbon fixation stage
13. In the chemiosmotic synthesis of ATP in a chloroplast, H+ diffuses through ATP synthase a. from the stroma into the thylakoid space b. from the thylakoid space into the stroma c. from the intermembrane space into the matrix d. from the cytoplasm into the intermembrane space e. from the matrix to the stroma
from the thylakoid space into the stroma
24. The major product of the Calvin Cycle is a. rubisco b. oxaloacetate c. RuBP d. pyruvate e. glyceraldehyde - 3- phosphate
glyceraldehyde - 3- phosphate
In green plants, most of the ATP for synthesis of proteins, cytoplasmic streaming, and other cellular activities comes directly from a. photosystem I b. photosystem II c. the Calvin cycle d. oxidative phosphorylation e. photophosphorylation
oxidative phosphorylation
Groups of photosynthetic pigment molecules situated in the thylakoid membrane are called a. photosystems b. carotenoids c. chlorophyll d. grana e. CAM plants
photosystems
Six molecules of G3P formed in the Calvin cycle are used to produce a. three molecules of gucose b. three molecules of RuBP and one G3P c. one molecule of glucose and four molecules of 3-phosphoglycerate d. one G3P and three four-carbon intermediates e. none of the above, since three molecules of G3P result from three turns of the Calvin cycle
three molecules of RuBP and one G3P
What portion of an illuminated plant cell would you expect to have the lowest pH? a. nucleus b. cytosol c. chloroplast d. stroma of chloroplast e. thylakoid space
thylakoid space
NADPH and ATP from the light reactions are both needed a. in the carbon fixation stage to provide energy and reducing power to rubisco b. to regenerate three RuBP from 5 G3P c. to combine two molecules of G3P to produce glucose d. to reduce 3-phosphoglycerate to G3P e. to reduce the H+ concentration in the stroma and contribute to the proton gradient
to regenerate three RuBP from 5 G3P
The chlorophyll known as P680 has its electron "holes" filled by electrons from a. photosystem I b. photosystwm II c. water d. NADPH e. accessory pigments
water