Light Dependant Reactions Of Photosynthesis

Question 1

Is NADPH oxidized or reduced in the process of photosynthesis?

Answer 1

Reduced

Added H+ so therefore also added e-

Question 2

where is the light-dependent reaction occurring in the chloroplast?

Answer 2

The thylakoid membranes

Question 3

what happens to the H+ from water?

Answer 3

It is used in for the electron transport system in the process known as chemiosmosis

Question 4

How is ATP made?

Answer 4

It is made through chemiosmosis

Question 5

Describe chemiosmosis/ATP synthase

Answer 5

Through active transport, using the energy from the e-, H+ moves into the thylakoid from the stroma

When inside the thylakoid the H+ uses diffusion (passive transport) to move the H+ back out through the thylakoid membrane’s phospholipid bilayer.

As it moves through it causes ADP and Pi to react and create ATP

Question 6

Describe photolysis/hydrolysis

Answer 6

splitting of H2O into 2H+ and 1/2 O2 using light energy

Question 7

What step does chemiosmosis/ATP synthase take place

Answer 7

Step 2

Question 8

What is the thylakoid lumen?

Answer 8

The space within the thylakoid membrane

Question 9

Trace the pathway of an electron during photosynthesis with steps

Answer 9

1. Hydrolysis occurs and water splits causing an electron to be released. Energy is gained when it reaches photosystem II and gets hit with light energy in the reaction center. It is then carried by an electron carrier to an electron acceptor.
2. The electron then loses energy in the electron transport system to produce ATP through chemiosmosis
3. The electron then regains energy in photosystem I and is then transferred by an electron carrier to another electron acceptor
4. The electron loses energy in the electron transport system one final time in order to produce NADPH

Question 10

What is the difference between chloroplast vs chlorophyll.

Answer 10

Chloroplast is the full organelle while chlorophyll is what is contained in the photosystem of the thylakoid which is what allows photosynthesis to take place

Question 11

Describe reducing power

Answer 11

High energy molecules have a high amount of energy which means they have a high amount of e- they could give away. This means they have the power to reduce other molecules which means they have a high reducing power