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GCSE Biology Cells, Tissues, Organs Summary Notes

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Everything you need to know about Cells, Tissues, Organs for GCSE Biology. Applicable for all courses but specifically curated for AQA Exam Board.

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June 17, 2023
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Cells, Tissues and Organs


Animal Cell Plant Cell

Nucleus Ribosomes Nucleus
Cell
Ribosomes Membrane



Vacuole
Cytoplasm


Cytoplasm
Cell Wall
Cell
Membrane
Mitochondria



Mitochondria Chloroplasts

Cell Organelle

Organelle - Tiny cellular structures that performs specific functions within a cell.

Chloroplasts – They contain chlorophyll which absorbs light for photosynthesis.

Vacuole - Filled with cell sap which makes it turgid (structure).

Cell Wall – Gives strength and support.

Nucleus – Controls the cell and contains DNA.

Cytoplasm – Where most of the chemical reactions take place, such as anaerobic
respiration.

Cell Membrane – Controls what passes into and out of the cell (partially permeable).

Mitochondria – Where aerobic respiration takes place, and energy is released.

Ribosomes – Where protein synthesis takes place.

Eukaryote

 All living things are made up of cells.
 Their structures depend on their functions.
 Animal and plant cells, eukaryotes, all have a nucleus, cytoplasm, cell membrane,
mitochondria and ribosomes.
 Plant and algal cells have a cell wall, and often chloroplasts and a permeable vacuole.
 Bacterial cells, prokaryotes, have different structures.

,  Dissolved substances pass in and out through diffusion.

A eukaryote is any organism whose cells contain a nucleus and other organelles enclosed
within membranes. All plant and animal cells are eukaryotic cells because they have a cell
membrane, cytoplasm and genetic material enclosed within a nucleus.

Prokaryote

 They do not have a nucleus.
 DNA floats around in the cell, but clumped together.
 Most prokaryotes are bacteria.
 They are very simple organisms but found everywhere on Earth and possibly Mars.
 Bacteria can be found in intestines, yoghurts and a bakery.
 They don’t usually have organelles
 They are bigger than a virus but smaller than amoeba

Bacteria Cell
Pili Plasmids
Capsule
Cell Membrane




Cell Wall
Capsule


Flagellum

Cell Membrane
Ribosomes Cell Wall
Loose Genetics
Info (DNA)


Cell Organelle

Capsule – Helps protect bacteria from white blood cells.

Plasmids – Small loops of DNA.

Flagellum – Helps the cell locomote (move).

Pili – Allows bacteria to attach to other surfaces.

Scale

1m = 1000mm
1mm = 1000Mm
1Mm = 1000nm
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