Biology topic 5

Question 1

Features of the thylakoid membrane

Answer 1

Folded membrane
Carries chlorophyll and electron carrier proteins
Involved in the light dependant reaction

Question 2

What is chemiosmosis

Answer 2

Movement of protons from a high to low concentration

Question 3

Where does the light-dependent reaction occur

Answer 3

In the thylakoid membrane/grana

Question 4

Features of the light dependent rxn

Answer 4

1st stage of photosynthesis- requires light
light energy + water = ATP and reduced NADP
Election excited to higher energy level- by energy trapped by chlorophyll molecules
Photolysis of water- splitting of water using light

Question 5

Which products of the LDR is required in LIR

Answer 5

Reduced NADP and ATP

Question 6

ATP production

Answer 6

Electrons move down transfer chain
Movement of H+ ions from stroma into intermembrane space
H+ move down electrochemical gradient, into stroma
Catalysed by ATP synthase- chemiosmosis

Question 7

Features of LIR

Answer 7

Occurs in chloroplasts- stroma
Stroma contains enzyme RuBisCo- temp sensitive
Uses CO2, reduced NADP and ATP- produces hexose sugar
ATP hydrolysed- releasing energy

Question 8

Absorption spectrum

Answer 8

Range of wavelengths of light that a photosynthetic pigment absorbs

Question 9

Action spectrum

Answer 9

Range of photosynthesis against wavelength of light absorbed