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23 Dec 2018

Answer the two questions.
1. During the light reactions:

(a) What force is responsible for driving H+ into the thylakoid space?

(b) What drives the H+ to leave the thylakoid space?

(c) How is the creation of a concentration gradient related to the formation of ATP?

2. Describe the electromagnetic spectrum. What kind of light drives photosynthesis? What is the wavelength range of this light?

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Hubert Koch
Hubert KochLv2
24 Dec 2018

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Related questions

Question 1 The membrane structures inside the chloroplast are called the ______, while the fluid surrounding the stacks of membrane is called the ______.
a. stroma; thylakoid
b. thylakoid; cytosol
c. thylakoid; stroma
d. thylakoid; matrix
e. matrix; thylakoid

Question 2 What is considered the ultimate source of energy for living things on Earth?
a. the sun
b. electrons
c. green plants
d. oxygen
e. ATP

Question 3 Why do most plant leaves appear green?
a. They contain a lot of starch which has a green color.
b. They have chloroplasts which absorb green light for photosynthesis.
c. During the light reaction phase carbon dioxide is converted to oxygen which emits green light.
d. They have chloroplasts which absorb all colors of light except for green, which is reflected.
e. During the dark reaction phase water is converted to oxygen which emits green light.

Question 4 Plants perform only photosynthesis, not respiration. True False

Question 5 What is the primary purpose of the light reactions of photosynthesis?
a. to create oxygen gas
b. to produce glucose
c. to convert solar energy to chemical energy (in the form of ATP and NADPH) to power the dark reactions
d. to remove carbon dioxide gas from the atmosphere
e. to create water

Question 6 The light dependent reactions occur in the:
a. mitochondrial membrane.
b. mitochondrial matrix.
c. stroma.
d. thylakoid membrane.
e. cytosol.

Question 7 The energy to run the dark reactions of photosynthesis is produced _________.
a. by the CO2 initially used in the dark reactions.
b. during glycolysis
c. during the light reaction phase
d. during the Krebs cycle
e. during anaerobic respiration

Question 8 Which of the following substances could be totally eliminated and not interfere with the process of photosynthesis?
a. O2
b. H2O
c. light
d. CO2

Question 9 What product(s) do plants produce during photosynthesis that is/are used by humans and other animals?
a. carbon dioxide
b. carbon dioxide and water
c. glucose and oxygen
d. glucose
e. oxygen

Question 10 Only plants can carry out photosynthesis. True False

Question 11 During the light reactions of photosynthesis, ...
a. oxygen is produced from H2O.
b. glycolysis occurs.
c. the Krebs cycle occurs.
d. CO2 is combined into glucose.
e. ATP is broken down to ADP + P

Question 12 The reactants of photosynthesis are:
a. sugar.
b. sugar and water.
c. O2 and CO2
d. O2 and sugar.
e. CO2 and water.

Question 13 During the dark reaction phase of photosynthesis in plants...
a. ATP is created.
b. H+ ions are moved into the stroma from the matrix.
c. molecules of CO2 are combined into sugar.
d. H2O is split into oxygen and H+.
e. solar energy is converted to chemical energy.

Please use 2-3 sentence to answer each question:

1. What are the possible fates of light energy captured by pigments in the PSII light harvesting complex?

2. Summarize the processes that lead to the accumulation of protons within the thylakoid lumen.

3. Describe the factors that regulate the activity of ATP synthase and prevent it from hydrolyzing ATP in the dark (running backward)

5. Reactive oxygen species are generated as a side effect of photosynthesis. What is their source and how does the cell protect against their harmful side effects?

6. How do drought and high or low temperatures affect the light reactions of photosynthesis?

What type of organisms are responsible for the production of most of the oxygen on Earth?

What molecule is the source of the electrons in the electron transport chain?

What molecule is the source of the oxygen that is released as a byproduct of photosynthesis?

Which of the following is the same thing as a proton?

What molecule is the source of the protons that are used to establish the proton gradient?

What molecule does the electron end up in at the end of the two light reactions (i.e. After Photosystems II and I)?

What is the proton gradient used for?

What does the term ‘carbon fixation’ refer to?

During the light-independent reactions, the Calvin Cycle requires NADPH and ATP. Where does the cell get these molecules?

The product of the light-independent reactions is a molecule called G3P. What does the cell use it for?

What is the overall functiono of photosynthesis; why do cells perform this process?

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