Higher Biology

Cell Ultrastructure

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By the end of this lesson:

You should be able to:

Know what an organelle isRecognise the following: ribosomes; nucleus; rough endoplasmic reticulum; chloroplasts; mitochondrian; Golgi BodyLabel named organelles on diagramsKnow the functions of named organelles

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Electron Microscope

The light microscope has limited magnification. The electron microscope uses a beam of highly

energetic electrons to examine objects on a very fine scale.

This examination can yield the following information:

Topography The surface features of an object or "how it

looks", its texture; direct relation between these features and materials properties (hardness, reflectivity...etc.)

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Electron Microscope

Morphology The shape and size of the particles making up

the object; direct relation between these structures and materials properties (ductility, strength, reactivity...etc.)

Composition The elements and compounds that the object is

composed of and the relative quantities of them; direct relationship between composition and materials properties (melting point, reactivity, hardness...etc.)

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Typical Animal Cell

Using a light microscope

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Typical Animal Cell

Using an electron microscope

Much more detail is revealed

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Typical Animal Cell

Using an electron microscope

The extrastructures

seenare called organelles

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Typical Animal Cell

Each organelle

has a specificfunction.

(Like mini-organs)

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Typical Plant Cell

Using a light microscope

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Typical Plant CellUsing an electron microscope

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Ultrastructure

1. Insert and complete the “Cell Ultrastructure” sheet from your pack into your notes.

2. Draw a table to show the functions of the following 7 cell structures:

Mitochondria

Rough Endoplasmic Reticulum

Golgi body

Chloroplasts

Cell membrane

NucleusRibosome

Use Pages 317-318 of Torrance

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By the end of this lesson:

Can you do it?

Know what an organelle isRecognise the following: ribosomes; nucleus; rough endoplasmic reticulum; chloroplasts; mitochondrian; Golgi BodyLabel named organelles on diagramsKnow the functions of named organelles