Photosynthesis

Question 1

What is the equation for photosynthesis?

Answer 1

6CO2 + 6H20 Light__> C6H12O6 + 6O2

Question 2

What is the site of photosynthesis?

Answer 2

Chloroplasts

Question 3

What are the 3 key parts in the structure of a chloroplast?

Answer 3

• Outer + inner membrane
• Stroma (similar to cytosol)
• Thylakoid- membrane system with big surface area to harvest light energy

Question 4

How many membranes does the chloroplast have and what are their names?

Answer 4

• 3
• outer
• inner
• thylakoid

Question 5

How many compartments does the Chloroplast have? What are they?

Answer 5

• 3
• In inter-membrane space
• stroma
• thylakoid space

Question 6

What are the two parts of photosynthesis?

Answer 6

• The light reactions

- the calvin cycle

Question 7

What is the purpose of the light reactions?

Answer 7

Capture light energy and convert it to chemical energy using pigment and protein complexes embedded in thylakoid membrane

Question 8

What are photosystems?

Answer 8

protein complexes that contain chlorophyll

Question 9

What is the purpose of chlorophyll in photosynthesis?

Answer 9

Absorbs light energy which is used to produce high energy electrons

Question 10

Explain the process of the light reactions/ photosynthetic electron transport chain

Answer 10

• photosystems capture light energy and produce high energy electrons
• electrons needed for photosystem two ( initial protein) are drawn from a water splitting reaction facilitated by photosystem 2
• high energy proteins travel to the cytochrome complex and energy is used to pump protons from the stroma to thylakoid space and create proton gradient
• now low energy electrons gain energy from light again at photosystem 1 and move to an enzyme complex that adds them to NADP+ to make NADPH
• proton gradient used by ATP synthase to add ADP + P ——-> ATP

Question 11

Where do the light reactions of photosynthesis take place?

Answer 11

Thylakoid

Question 12

What generally occurs in the Calvin Cycle?

Answer 12

ATP and NADPH produces in light reactions. are used to fix CO2 and produce carbohydrate (sugar)

Question 13

What are the 3 steps of the calvin cycle?

Answer 13

• Fixation
• Reduction
• Regeneration

Question 14

What occurs during the fixation step of the calvin cycle?

Answer 14

5 carbon molecule + CO2 ——-> 2x 3 carbon molecules

Question 15

What occurs during the Reduction section of the Calvin cycle?

Answer 15

• 3 carbon molecule is converted into a different 3 carbon molecule using 6ATP and 6NADPH

Question 16

What occurs during the regeneration section of the calvin cycle?

Answer 16

The 3 carbon molecule is converted back to the 5 carbon molecule using 3ATP

Question 17

What is the output of the calvin cycle?

Answer 17

3 turns of the calvin cycle produce a 3 carbon sugar that is converted to glucose

Question 18

What are the inputs of photosynthesis and where?

Answer 18

• light ( light reactions/ thylakoid)
• H20 ( light reactions/ thylakoid)
• CO2 ( calvin cycle/ stroma)

Question 19

What are the outputs of photosynthesis and where?

Answer 19

• Glucose ( calvin cycle)

- O2 ( splitting water in light reaction / thylakoid)