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IGCSE Edexcel
Biology
2. Structure & Function in Living Organisms
Biology
IGCSE Edexcel
Revision Notes
2. Structure & Function in Living Organisms
2.1 Level of Organization
>
2.2 Cell Structure
>
2.3 Biological Molecules
>
2.4 Movement of Substances Into and Out of Cells
>
2.5 Nutrition (in Plants)
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2.6 Nutrition (in Human)
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2.7 Respiration
>
2.8 Gas Exchange (in Plants)
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2.9 Gas Exchange (in Human)
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2.10 Transport (in Plants)
>
2.11 Transport (in Human)
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2.12 Excretion (in Plants)
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2.13 Excretion (in Human)
>
2.14 Coordination and Response (in Plants)
>
2.15 Coordination and Response (in Human)
>
1. The Nature & Variety of Living Organisms
1.1 Characteristics of Living Organisms
>
3. Reproduction & Inheritance
3.1 Reproduction (in Plants)
>
3.2 Reproduction (in Human)
>
3.3 Inheritance
>
4. Ecology & The Environment
4.1 The Organism in the Environment
>
4.2 Feeding Relationships
>
4.3 Cycles within Ecosystems
>
4.4 Human Influences on the Environment
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5. Use of Biological Resources
5.1 Food Production
>
5.2 Selective Breeding
>
5.3 Genetic Modification (Genetic Engineering)
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5.4 Cloning
>
2.2 Cell Structure
2.2.1 Describe cell structures, including the nucleus, cytoplasm, cell membrane, cell wall, mitochondria, chloroplasts, ribosomes and vacuole
2.2.2 Describe the functions of the nucleus, cytoplasm, cell membrane, cell wall, mitochondria, chloroplasts, ribosomes and vacuole
2.2.3 Know the similarities and differences in the structure of plant and animal cells
2.2.4 Know the similarities and differences in the structure of plant and animal cells
Specialised cells:
Specialised cells
have particular characteristics responsible for certain functions
Formed by
cell differentiation
All cells contain the same genetic material
Genes expressed dictate function of cell
Cell differentiation:
The development of
subcellular structures
In animals most cells differentiate at early stages of development
In plants cells differentiation can occur at any stage of development
2.2.5 Understand the advantages and disadvantages of using stem cells in medicine
Stem cells:
An undifferentiated cell that has the ability to
differentiate
into any type of
specialised cell
Continue differentiating throughout the animals life
Replace and repair cells
Can divide by
mitosis
to produce more undifferentiated stem cells
Type of stem cells:
Embryonic stem cell
Undifferentiated
cell
Totipotent
Can differentiate into all the different tissues and organs of the human body
Formed in zygotes
Adult stem cell
:
Can not differentiate into any cell
Can form some specialised cells
Used to replace damaged cells or produce new cells
Meristem cell
:
Unspecialised cells
Differentiate into cells required by plants
Found at location of growth: root and shoot tips
Previous
2.1 Level of Organization
Next
2.3 Biological Molecules
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