Process
OCR A-Level Biology H420
Cell Structure
Biological Molecules
Nucleotides and Nucleic Acids
Enzymes
Biological Membranes
Cell Division, Cell Diversity and Cellular Organisation
Exchange Surfaces
Transport in Animals
Transport in Plants
Communicable Diseases, Disease Prevention and the Immune System
Biodiversity
Classification and Evolution
Communication and Homeostasis
Excretion as an Example of Homeostatic Control
Neuronal Communication
Hormonal Communication
Plant and Animal Responses
Topic overviewTropisms and plant responses to stress and herbivoryPlant hormones and their commercial usesThe nervous system and the brainReflex actions and the knee jerk reflexFight or flight and the control of heart rateThe structure of skeletal muscleThe neuromuscular junction and the sliding filament model
Photosynthesis
Respiration
Cellular Control
Patterns of Inheritance
Manipulating Genomes
Cloning and Biotechnology
Topic overviewNatural plant cloning and taking cuttingsMicropropagationAdvantages and disadvantages of plant cloningAnimal cloning: embryo twinning and nuclear transferAdvantages and disadvantages of animal cloningMicroorganisms in food productionAseptic techniqueFermentation and its conditionsThe microbial growth curveImmobilised enzymes
Ecosystems
Populations and Sustainability
Practical Skills and Mathematical Requirements
Photosynthesis
The light-dependent stage
- 2 things to know
- Components 01 and 03
Overview
What happens to an electron when a pigment absorbs light, non-cyclic and cyclic photophosphorylation, and the three things the photolysis of water provides.
What you need to know
Answer each one before you reveal it.
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Key term
How are electrons replaced in photosystem II during non-cyclic photophosphorylation?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What happens to electrons in photosystem pigments when light energy is absorbed?
Model answer
Light energy excites electrons in photosystem pigments to higher energy levels.
- 2
What happens to excited electrons after they leave the photosystem?
Model answer
Excited electrons pass along a chain of electron carriers in the thylakoid membrane.
- 3
How is ATP synthesised during the light-dependent stage?
Model answer
Energy released as electrons pass along electron carriers is used to synthesise ATP by chemiosmosis.
- 4
Which photosystems are involved in non-cyclic photophosphorylation, and what are its products?
Model answer
Non-cyclic photophosphorylation involves both photosystem I and photosystem II and produces ATP, reduced NADP and oxygen.
- 5
How are electrons replaced in photosystem II during non-cyclic photophosphorylation?
Model answer
Electrons from photosystem II are replaced by electrons from the photolysis of water.
- 6
What is the fate of electrons from photosystem I in non-cyclic photophosphorylation?
Model answer
Electrons from photosystem I reduce NADP to form reduced NADP.
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