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