CELLS Topic 1 Biology 2012. What are living things made of? Living things are made up of cells ...
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Transcript of CELLS Topic 1 Biology 2012. What are living things made of? Living things are made up of cells ...
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CELLSTopic 1 Biology 2012
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What are living things made of?
Living things are made up of cells
Cells are the building blocks of life
They come in all shapes and sizes.
Some organisms are made up of only one cell and are called uni-cellular.
Others are made up of lots of cells and are called multi-cellular.
Cells work together and carry out the seven life processes that are needed for an organism to stay alive.
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Seven life processes aka Characteristics of Living Things
All living things do the following
• Watch the You tube clip to identify the 7 characteristics of living things
• http://www.youtube.com/watch?v=aynclw6TXeE&feature=related
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Seven life processes aka Characteristics of Living Things
All living things do the following;
Not musically inclined, try this useful pneumonic.
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The Cell Theory
1. All organisms are made up of one
or more cells.
2. The cell is the basic LIVING unit
of organization for all organisms.
3. All cells arise from pre-existing cells.
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6Cells ~ Basic building Cells ~ Basic building blocksblocks
There are 2 main types of cells;
PROKARYOTIC CELLSEUKARYOTIC CELLS
Eukaryotic cells are complexProkaryotic cells are more basic
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Prokaryotic CellsAre extremely small
Have simple internal structure
No membrane-bound organelles
No membrane-bound nucleus
Kingdoms they belong to are; Monera (bacteria) Archaea
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Generalised Prokaryotic cell
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Eukaryotic CellsCan be single celled organisms
Can be Multicellular organisms
Have a complex internal structure
Have membrane-bound organelles
Have a membrane-bound nucleus
Kingdoms they belong to are; Plantae Animalia Protista Fungi
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Generalised eukaryotic cell10
Animal cell
Plant cell
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Cell Size + SpecialisationCell specialisation refers to cells that have
taken on special features to enable them to carry out their task.
This is critical for multicellular organisms.
Size is an important factor in the functioning of cells
The cell must be able to efficiently remove wastes and obtain its requirements.
The rate of outward movement of wastes and inward movement of requirements will influence the size to which the cell will grow.
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Cell SizeCells are measured in:
Microns μm = 10-6 of a metreNanometres nm = 10-9 of a metre
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Animal and plant cells come in different shapes and sizes, but they all have three basic features orparts known as organelles
Plants + animal Cells
plant cellanimal cell
cytoplasm
cell membrane
Plant cells also have some extra features that make them different to animal cells.
nucleus
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Organelles:Taking on Different Jobs
Boundary – plasma membranePower Supply – mitochondria Building Cell Structures – ribosomes Supporting Cell Structures – cytoskeleton Transport with the Cell – endoplasmic
reticulumPackaging & Distribution – golgi apparatusRecycling & Reuse – lysosomes Moving in & out – endocytosis & exocytosisCoordinating cell activities – nucleus
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Specialised structures in plants
Chloroplasts – needed for photosynthesis (contain chlorophyll)
Vacuoles (organelles) – for storage of sugars, minerals, proteins & water. They are much bigger in plants than in animals. Can you think of why this might be?
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Cell MovementCells need to be able to move around in order to meet
their requirements for survival or to perform a specific function.
ACTIVE MOVEMENT Cells can move due to specialised structures such as
FLAGELLA & CILIA
PASSIVE MOVEMENT Cells move about because the medium in which they are
located moves them. For example; blood moves RBC’s
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Flagella
Cilia
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A school is made up of an organized system.
Individual pupil
Registration group
Subject class
Year group
School
How is the body organized?
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Structure of organismsSimilarly to the school, the structure of multicellular
organisms is based around the following ‘levels’ of organisation:
CELLS TISSUES ORGANS SYSTEMS WHOLE ORGANISM
Ultimately, the survival ability of each organism depends upon the functioning of all its individual cells.
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