Chapter 15, Problem 3P

Interpretation Introduction

(a)

Interpretation:

Gibbs energy for the production of proton in acidic pH 4 of thylakoid should be identified.

Concept Introduction:

The Gibbs energy can be determined as;

$\text{dG = }-\text{2}\text{.303 RT log }\frac{\left[{\text{H}}_{\text{lumen}}\right]}{\left[{\text{H}}_{\text{stroma}}\right]}$

Where, R is gas constant

T is temperature

$\left[{\text{H}}_{\text{lumen}}\right]$ is hydrogen ion concentration of lumen and $\left[{\text{H}}_{\text{stroma}}\right]$ is concentration of hydrogen ion of stroma.

Interpretation Introduction

(b)

Interpretation:

Wavelength required for the production of energy should be identified.

Concept Introduction:

Energy and wavelength are related to each other as follows:

$\text{E }=\text{ hc }/\lambda$

Where, E is energy

c is speed of light

$\lambda$ is wavelength

Interpretation Introduction

(c)

Interpretation:

Gibbs energy for production of oxygen should be identified.

Concept Introduction:

The cyclic photophosphorylation depends more on the ATP synthesis. Photosystem 1 absorbs 4 protons that results in the release of 8 protons in the lumen with the help of cytochrome bf system. Two molecules of ATP are formed by the flow of these protons through ATP synthase. This absorbed each of the 2 protons and form 1 molecule of ATP and no NADPH is produced.