Edexcel IAL · AS

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Edexcel IAL AS Biology.

100 lessons · 3 units

WBI11

Unit 1: Molecules, Diet, Transport and Health

AS Year 12 paper. Covers biological molecules, mammalian transport systems, and health.

46 lessons

Lesson 01
Water as a biological solvent
Coming soon
Lesson 02
Carbohydrates: monosaccharides, disaccharides and polysaccharides
Coming soon
Lesson 03
Energy-storage roles of starch, glycogen, amylose and amylopectin
Coming soon
Core Practical
Lesson 04
Core Practical 1: Benedict's and iodine semi-quantitative tests
Coming soon
Lesson 05
Condensation, hydrolysis and glycosidic bonds
Coming soon
Lesson 06
Triglycerides and ester bonds
Coming soon
Lesson 07
Saturated vs unsaturated lipids
Coming soon
Lesson 08
Why animals need mass transport systems
Coming soon
Lesson 09
Arteries, veins and capillaries: structure-function relationships
Coming soon
Lesson 10
Mammalian heart structure and major blood vessels
Coming soon
Lesson 11
Cardiac cycle: atrial systole, ventricular systole and diastole
Coming soon
Lesson 12
Haemoglobin and oxygen/carbon dioxide transport
Coming soon
Lesson 13
Oxygen dissociation curves, Bohr effect and fetal haemoglobin
Coming soon
Lesson 14
Atherosclerosis: endothelial dysfunction, inflammation, plaques and blood pressure
Coming soon
Lesson 15
Blood clotting and cardiovascular disease
Coming soon
Lesson 16
CVD risk factors: genetics, diet, age, gender, hypertension, smoking and inactivity
Coming soon
Lesson 17
Dietary antioxidants and cardiovascular health
Coming soon
Core Practical
Lesson 18
Core Practical 2: vitamin C content of food and drink
Coming soon
Lesson 19
Health-risk data: illness, mortality, correlation and causation
Coming soon
Lesson 20
Evaluating health studies: sample selection, sample size, validity and reliability
Coming soon
Lesson 21
Risk perception and lifestyle choices
Coming soon
Lesson 22
Cholesterol, obesity indicators and cardiovascular disease treatments
Coming soon
Lesson 23
Gas exchange surfaces and Fick's Law
Coming soon
Lesson 24
Mammalian lung structure and adaptations
Coming soon
Lesson 25
Membrane structure and the fluid mosaic model
Coming soon
Core Practical
Lesson 26
Core Practical 3: membrane permeability, alcohol and temperature
Coming soon
Lesson 27
Osmosis and water potential
Coming soon
Lesson 28
Passive transport, facilitated diffusion and active transport
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Lesson 29
Endocytosis, exocytosis and ATP in membrane transport
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Lesson 30
Amino acids, peptide bonds and protein formation
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Lesson 31
Protein structure: primary to tertiary; globular and fibrous proteins
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Lesson 32
Haemoglobin and collagen: structure-function comparisons
Coming soon
Lesson 33
Enzyme specificity, activation energy and enzyme types
Coming soon
Core Practical
Lesson 34
Core Practical 4: factors affecting enzyme initial rate
Coming soon
Lesson 35
Mononucleotides, DNA and RNA structure
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Lesson 36
DNA double helix and complementary base pairing
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Lesson 37
DNA replication and DNA polymerase
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Lesson 38
Meselson and Stahl: evidence for semi-conservative replication
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Lesson 39
Genetic code and gene definition
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Lesson 40
Protein synthesis I: transcription
Coming soon
Lesson 41
Protein synthesis II: translation, mRNA, tRNA, ribosomes and codons
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Lesson 42
Mutations: substitution, insertion, deletion and outcomes
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Lesson 43
Monohybrid inheritance terminology and crosses
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Lesson 44
Pedigrees, codominance and sex linkage
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Lesson 45
Cystic fibrosis: gene mutation and body-system effects
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Lesson 46
Genetic screening and ethical/social issues
Coming soon

WBI12

Unit 2: Cells, Development, Biodiversity and Conservation

AS Year 12 paper. Covers cell biology, reproduction, plant biology, biodiversity and conservation.

48 lessons

Lesson 47
Cells as units; tissues, organs and organ systems
Coming soon
Lesson 48
Eukaryotic ultrastructure and organelle functions
Coming soon
Lesson 49
Rough ER, Golgi apparatus and protein transport
Coming soon
Lesson 50
Prokaryotic ultrastructure and functions

WBI13

Unit 3: Practical Skills in Biology I

AS practical assessment — investigative skills, methods, and data analysis.

6 lessons

Lesson 95
Planning investigations: hypotheses, variables and apparatus
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Lesson 96
Implementation: measurements, safety, uncertainty and error
Coming soon
Lesson 97
Processing results: tables, graphs, calculations and conclusions
Coming soon
Lesson 98
Unit 3 practical-paper practice using unfamiliar contexts

Unit 1: Molecules, Diet, Transport and Health

Water as a biological solvent

Carbohydrates: monosaccharides, disaccharides and polysaccharides

Energy-storage roles of starch, glycogen, amylose and amylopectin

Core Practical 1: Benedict's and iodine semi-quantitative tests

Condensation, hydrolysis and glycosidic bonds

Triglycerides and ester bonds

Saturated vs unsaturated lipids

Why animals need mass transport systems

Arteries, veins and capillaries: structure-function relationships

Mammalian heart structure and major blood vessels

Cardiac cycle: atrial systole, ventricular systole and diastole

Haemoglobin and oxygen/carbon dioxide transport

Oxygen dissociation curves, Bohr effect and fetal haemoglobin

Atherosclerosis: endothelial dysfunction, inflammation, plaques and blood pressure

Blood clotting and cardiovascular disease

CVD risk factors: genetics, diet, age, gender, hypertension, smoking and inactivity

Dietary antioxidants and cardiovascular health

Core Practical 2: vitamin C content of food and drink

Health-risk data: illness, mortality, correlation and causation

Evaluating health studies: sample selection, sample size, validity and reliability

Risk perception and lifestyle choices

Cholesterol, obesity indicators and cardiovascular disease treatments

Gas exchange surfaces and Fick's Law

Mammalian lung structure and adaptations

Membrane structure and the fluid mosaic model

Core Practical 3: membrane permeability, alcohol and temperature

Osmosis and water potential

Passive transport, facilitated diffusion and active transport

Endocytosis, exocytosis and ATP in membrane transport

Amino acids, peptide bonds and protein formation

Protein structure: primary to tertiary; globular and fibrous proteins

Haemoglobin and collagen: structure-function comparisons

Enzyme specificity, activation energy and enzyme types

Core Practical 4: factors affecting enzyme initial rate

Mononucleotides, DNA and RNA structure

DNA double helix and complementary base pairing

DNA replication and DNA polymerase

Meselson and Stahl: evidence for semi-conservative replication

Genetic code and gene definition

Protein synthesis I: transcription

Protein synthesis II: translation, mRNA, tRNA, ribosomes and codons

Mutations: substitution, insertion, deletion and outcomes

Monohybrid inheritance terminology and crosses

Pedigrees, codominance and sex linkage

Cystic fibrosis: gene mutation and body-system effects

Genetic screening and ethical/social issues

Unit 2: Cells, Development, Biodiversity and Conservation

Cells as units; tissues, organs and organ systems

Eukaryotic ultrastructure and organelle functions

Rough ER, Golgi apparatus and protein transport

Prokaryotic ultrastructure and functions

Unit 3: Practical Skills in Biology I

Planning investigations: hypotheses, variables and apparatus

Implementation: measurements, safety, uncertainty and error

Processing results: tables, graphs, calculations and conclusions

Unit 3 practical-paper practice using unfamiliar contexts

Recognising organelles in electron micrographs

Microscopy: magnification, resolution and staining

Core Practical 5: observing and drawing animal cells

Core Practical 5: graticules, measurement and scale

Loci and gene linkage

Meiosis: independent assortment and crossing over

Specialisation of mammalian gametes

Fertilisation in mammals

Fertilisation in flowering plants

Mitosis and the cell cycle

Core Practical 6: root tip squash and mitosis stages

Mitotic index calculations

Stem cells, potency, morula and blastocyst

Medical uses and ethical decisions around stem cells

Differential gene expression and cell specialisation

Post-transcriptional changes to mRNA

Genotype, environment and phenotype

Epigenetics: DNA methylation and histone modification

Multiple alleles, polygenic inheritance and continuous variation

Topic 3 consolidation: microscopy, cell division and gene expression

Plant cell ultrastructure and comparison with animal cells

Recognising plant organelles in electron micrographs

Starch and cellulose: structure-function relationships