Overview of Photosynthesis

Question 1

How is the diversity of life possible?

Answer 1

-Bc our planet is overflowing in energy streaming Earthward from the sun

Question 2

How much energy does photosynthesis capture?

Answer 2

-About 1% of the huge supply of energy= 10,000 hiroshima bombs

Question 3

What are the 2 forms of Photosynthesis?

Answer 3

• Anoxygenic

- Oxygenic

Question 4

What is Anoxygenic photosynthesis?

Answer 4

• Is the form that doesn’t produce oxygen bc they convert hydrogen sulfide (H2S) in globules of pure sulfur that accumulates inside of them
• It’s found in 4 different bacterial groups

Question 5

What are the 4 bacterial groups that Anoxygenic photosynthesis is found?

Answer 5

• Purple bacteria
• Green sulfur bacteria
• Green non-sulfur bacteria
• Heliobacteria

Question 6

What is Oxygenic photosynthesis?

Answer 6

• It is the form that produces oxygen

- It is found in cyanobacteria, 7 groups of algae & all land plants

Question 7

What does Anoxygenic & Oxygenic photosynthesis have in common?

Answer 7

-The types of pigments that they use to trap light energy

Question 8

How does Anoxygenic & Oxygenic photosynthesis differ?

Answer 8

-In the arrangement & action of these pigments

Question 9

Where does photosynthesis take place?

Answer 9

-In the leaves bc the leaves have organelles= chloroplasts

Question 10

What are the 3 stages of photosynthesis?

Answer 10

1) capturing energy from sunlight then it
2) uses the energy to make ATP and reduce the NADP+ compound to NADPH and then
3) it uses the ATP & NADPH to power photosynthesis of organic molecules from CO2 in the air

Question 11

What stages of photosynthesis are the Light-Dependant reactions?

Answer 11

-The first 2 stages are light dependant reactions

Question 12

What stage utilizes Carbon-Fixation?

Answer 12

• The 3rd stage bc it is the formation of organic molecules into CO2
• Carbon-fixation is cyclic so it can occur with or without light which makes it a light-independant reaction

Question 13

What is the equation for photosynthesis?

Answer 13

CO2+H20+light—> C6H12O6+6H2O+602

Question 14

How is CO2 reduced?

Answer 14

-Its reduced to glucose using electrons gained from the oxidation of water= requires energy that is provided by light

Question 15

What is the Thylakoid membrane?

Answer 15

• Its a continuous phospholipid bilayer organized into flattened sacs that are stacked on top of eachother to form columns= grana
• It also contains chlorophyll, other pigments to capture light (photosystems), & the machinery to make ATP

Question 16

What is the Stroma Lamella?

Answer 16

-It is the connection between grana

Question 17

What is the stroma?

Answer 17

• It surrounds the thylakoid membrane
• It houses enzymes needed to assemble organic molecules from CO2 using energy from ATP coupled w/ the reduction via NADPH

Question 18

What are Photosystems?

Answer 18

• They are result of the formtion of photosynthetic pigments clustered together in the thylakoid membrane w/ a specific organization
• They act like a large antenna that gathers light energy harvested by many individual molecules

Question 19

How do Photosystems work?

Answer 19

• So each pigment within the photosystem is able to capture photons
• And when a properwavelenngth strikes the pigment, it causes and excited electron’s energy to pass through from molecule to another
• When the energy arrives to a specific chlorophyll molecule in contact w/ a membrane bound protein, the energy passes on to a series of other membrane proteins that put the energy to work making ATP & NADPH