Funcion of cell memrane
Holds the cell together
Controls what goes in and out of the call
separates the inside of the cell from the environment outside
Function of cytoplasm
A jelly-like fluid in which organelles are found
Chemical reactions take place here
Function of ribosome
The site for protien sunthesis in the cell
Function of mithochondria
Site for aerobic respiration
provides energy to the cells
FUntion of a neucleus
Contains genetic materials
Controlls all activities inside the cell
Which cellular components are found in an animal cell?
Nucleus
ribosome
cell membrane
cytoplasm
mithochondria
Which are the extra cellular components in a plant cell?
chloroplast
permanent vacuole filled with cell sap
cell wall
What is the function of chloroplast?
Contains green chlorophyll pigment which absorbs light for photosynthesis
What is the funtion of a cell wall wand what is it made up of ?
It is made up of cellulose (a polymer of glucose)
which strengths the call and gives extra support defining its shape
What is the function of a permanent vacuole?
Contaims cell sap (a solution of sugars and salts dissolved in water)
Gives cells structure and support
used for storage of certain materials
What kind of cells are procaryotic cells?
Bacterial cells
What are the difference between eukaryotic cells and procaryotic cells?
procaryotic cells have small rings of DNA called plasmids
Procaryotic cells are uni cellular
eukaryotic cells have mitochondria
Procaryotic cells are smaller than eukaryotic cells
procaryotic cells do not have a neucleus
Formula for calculating magnification
Magnification = Image size / actual size
what does µm stand for?
Micrometer
how many µm (micrometer) is 1 mm?
1mm= 1000µm
How many nm (nano meter) is 1 µm?
1 µm = 1000 nm
cm to mm
1 cm= 10 mm
m to mm
1 m = 1000m
How does a light microscope work?
Light from a mirror (or light source) passes through the spicemen, objective lens, the eyepiece lens, then into our eyes
Advantages of a light microscope compared to an electron microscope
cheap
easy to use
small, so portable
produce colour images
can see living spiecemens
disvantages of a light microscope compared to an electron microscope
relies on light
has a longer wave length than electrons, so they have a lower resolution than electron microscopes
lower maximun magnification, so details such as details of sub cellular structures arent often visible.
disvantages of an electron microscope compared to a light microscope
expensive
difficult to use and requires specialist training
image can only be seen in black and white
large so difficult to transport
can only view dead spicemens
Advantages of a electron microscope
-Higher resolution
-Higher magnification
An electron microscope has much higher magnification and resolving power than a light microscope.
This means that it can be used to study cells in much finer detail. This has enabled biologists to see and understand many more sub-cellular structures.