A Level Biology A OCR
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106 topics in 25 modules
☑️ Development of Practical Skills 3 topics
- Planning an Experiment
- Processing and Presenting Data
- Drawing Conclusions and Evaluating
☑️ Cell Structure 4 topics
- Eukaryotic Cells
- Organelles
- Prokaryotic Cells
- Microscopes
☑️ Biological Modules 7 topics
- Water
- Carbohydrates
- Lipids
- Proteins
- Inorganic Ions
- Biochemical Tests for Molecules
- Separating Molecules
☑️ Nucleotides and Nucleic Acids 5 topics
- Nucleotides
- Polynucleotides and DNA
- Genes and Protein Synthesis
- Transcription
- Translation
☑️ Enzymes 3 topics
- Actions of Enzymes
- Factors Affecting Enzyme Activity
- Enzyme Inhibition
☑️ Biological Membranes 2 topics
- Cell Membranes
- Transport Across Cell Membranes
☑️ Cell Division and Cellular Organisation 4 topics
- The Cell Cycle and Mitosis
- Sexual Reproduction and Meiosis
- Stem Cells and Differentiation
- Tissues, Organs and Systems
☑️ Exchange and Transport 4 topics
- Specialised Exchange Surfaces
- The Gaseous Exchange System in Mammals
- Ventilation in Mammals
- Ventilation in Fish and Insects
☑️ Transport in Animals 5 topics
- Circulatory Systems
- Blood Vessels
- The Heart
- Heart Activity
- Haemoglobin
☑️ Disease and the Immune System 5 topics
- Pathogens and Communicable Diseases
- Defence Against Pathogens
- The Immune System
- Immunity and Vaccinations
- Antibiotics and Other Medicines
☑️ Biodiversity 3 topics
- Biodiversity
- Conservation and Biodiversity
- Importance of Biodiversity
☑️ Classification and Evolution 5 topics
- Basics
- Evolution of Classification System
- Variation
- Adaptations
- Evolution Theory
☑️ Communication and Homeostasis 8 topics
- Communication and Homeostasis
- Receptors and Neurones
- Action Potentials
- Synapses
- The Hormonal System
- Control of Body Temperature
- Control of Blood Glucose
- Diabetes
☑️ Excretion 4 topics
- Controlling Water Potential
- Kidney Failure
- The Kidneys and Excretion
- The Liver and Excretion
☑️ Animal Responses 3 topics
- The Nervous System
- 'Fight or Flight' Response and Heart Rate
- Muscle Contraction
☑️ Plant Responses and Hormones 2 topics
- Plant Responses
- Plant Hormones
☑️ Photosynthesis 3 topics
- Photosynthesis
- Respiration
- Limiting Factors in Photosynthesis
☑️ Respiration and Cellular Control 3 topics
- Aerobic Respiration
- Anaerobic Respiration
- Regulating Gene Expressions
☑️ Patterns of Inheritance 4 topics
- Types and Causes of Variation
- Inheritance
- Linkages and Epistasis
- The Chi-Squared Test
☑️ Evolution 5 topics
- Natural Selection
- Genetic Drift
- Hardy Weinberg Principle
- Artificial Selection
- Speciation
☑️ Manipulating Genomes 6 topics
- Common Techniques
- DNA Profiling
- Genetic Engineering
- Genetically Modified Organisms
- Gene Therapy
- Sequencing Genes and Genomes
☑️ Cloning and Biotechnology 4 topics
- Plant Cloning
- Animal Cloning
- Biotechnology
- Immobilised Enzymes
☑️ Ecosystems 4 topics
- Ecosystems
- Energy Transfer through an Ecosystem
- Recycling in Ecosystems
- Succession
☑️ Populations and Sustainability 2 topics
- Factors Affecting Population Size
- Conservation of Ecosystems
☑️ Transport in Plants 8 topics
- Transport Systems in Multicellular Plants
- Structure and Function of the Vascular System
- Distribution of Xylem and Phloem
- Position and Structure of Xylem Vessels
- Transpiration and Factors that Affect Transpiration Rates
- Transport of Water
- Adaptations of Plants to the Availability of Water
- The Mechanism of Translocation
A Level Biology A OCR Revision Content
Take a look at the written content available for this course. Practice-question availability may vary.
A Level Biology A OCR - Development of Practical Skills - Planning an Experiment Content Preview
Development of Practical Skills
Planning an Experiment
Objective and Hypothesis
- Identify the objective of the experiment, defining what the study aims to discover or confirm.
- Formulate a clear and testable hypothesis based on prior research or theory.
- The hypothesis should be an educated prediction of the experiment's expected outcome.
Research and Variables
- Conduct thorough background research about the topic to understand previously discovered information.
- Identify dependent, independent, and controlled variables in the experiment.
- The dependent variable is the phenomenon or condition you aim to observe or measure as a result of the experiment.
- The independent variable is the characteristic or condition you change intentionally to observe its effect on the dependent variable.
- Controlled variables are conditions kept constant to ensure that changes in the dependent variable are due to the manipulation of the independent variable.
Experimental Design
- Develop the experiment design, detailing the steps and procedures to be followed.
- The experimental design should include descriptions of materials and apparatus to be used.
- Determine the sample size and replication requirements for your study.
- Consider potential risks and ethical implications related to your experiment and outline how they will be mitigated.
Data Collection and Analysis
- Plan your data collection methods, ensuring they are precise, accurate and safe.
- Define how the data will be recorded, possibly using tables, photographs, or notes.
- Describe the statistical analyses that will be used to interpret your data, such as averages, standard deviation, or t-tests.
Evaluation
- Identify potential sources of error or bias in your experiment and indicate steps that will be taken to minimise them.
- Describe how the reliability and validity of your experiment will be ensured.
- Propose ways of improving the experimental design or methodology, based on potential limitations or weaknesses.
Remember that every experiment is different, thus these points may not be enough and other details might be needed depending on the experiment's nature. Also, always ensure your plans meet all safety and ethical guidelines.
Question: Describe how you would identify and mitigate a potential source of error in the experimental design of a biology experiment.
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