Download Cell Ultrastructure

Higher Biology
Cell Ultrastructure
By the end of this lesson:

You should be able to:
Know what an organelle is
Recognise the following: ribosomes; nucleus; rough
endoplasmic reticulum; chloroplasts;
mitochondrian; Golgi Body
Label named organelles on diagrams
Know the functions of named organelles
2
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.)
3
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.)
4
Typical Animal Cell
Using a light
microscope
5
Typical Animal Cell
Using an electron
microscope
Much more detail is
revealed
6
Typical Animal Cell
Using an electron
microscope
The extra
structures
seen
are called
organelles
7
Typical Animal Cell
Each organelle
has a specific
function.
(Like miniorgans)
8
9
Typical Plant Cell
Using a light
microscope
10
Typical Plant Cell
Using an electron
microscope
11
Ultrastructure
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:
1.
Mitochondria
Ribosome
Rough Endoplasmic Reticulum
Chloroplasts
Nucleus
Golgi body
Cell membrane
Use Pages 317-318 of Torrance
12
By the end of this lesson:

Can you do it?
Know what an organelle is
Recognise the following: ribosomes; nucleus; rough
endoplasmic reticulum; chloroplasts;
mitochondrian; Golgi Body
Label named organelles on diagrams
Know the functions of named organelles
13