Biology Paper 1 AQA Science Trilogy and Triple

106 Pages·2017·13.77 MB·English

by  W Richards

17/04/2018
AQA Science
Trilogy and Triple
Biology Paper 1
17/04/2018
B1 Cells and Cell Transport
Starter: Mark your
homework exam questions
and show me your revision
notes.
Hwk: Complete week 2 of
revision timetable making
revision notes and
complete exam questions
(Weds)
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Microscopes
Light Microscopes Electron Microscopes
Light microscope enable Electron microscopes use an
us to see images of electron beam focused by
microscopic objects by electromagnets to view
magnifying them, which we specimens which cannot be
cannot see with the naked seen with light microscopes.
eye.
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1 micrometre is
one millionth of
a metre.
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Microscope Calculations
1. What is the total
magnification of an
image if the
microscopes has an
eyepiece of x10
magnification and an
objective of x40
magnification?
2. Calculate the actual
size of the object if
the size of the
image is 0.25cm and
the magnification is
x40?
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A Typical Animal Cell
4) Ribosomes – protein
1) Cytoplasm - this is
synthesis happens
where the reactions
here
happen and these are
controlled by enzymes
2) Nucleus –
5) Mitochondria -
controls the
energy is released
cell’s activities
here during
respiration
3) Cell Membrane –
controls what
comes in and out
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A Typical Plant Cell:
Cell wall – made
of cellulose which
strengthens the cell
Cell membrane
– controls what Chloroplasts (containing
comes in and out chlorophyll) – this is needed
for photosynthesis
Nucleus – controls
Large vacuole – what the cell does and
contains sap and stores information
helps support the
cell
Cytoplasm –
Chemical reactions
happen here
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Eukaryotic and Prokaryotic Cells
• Prokaryotic Cells:
– Have DNA but NOT enclosed in a nucleus.
– Have cytoplasm and cell membrane enclosed in a cell wall.
– Smaller than Eukaryotic cells.
– Example is bacteria.
Eukaryotic cells:
Have DNA enclosed
in a nucleus
Have cell membrane
and cytoplasm
Example is an animal
cell.
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Specialised animal cells
I.D: Red Blood Cell
Function:
Carries oxygen around the
body
Features:
No nucleus and large
surface area
What are their jobs and how are they
specialised to carry them out? Think about
how they are different!
I.D: Sperm Cell
Function: Travel and fertilise
Egg.
Features:
???
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Specialised animal cells
I.D:
Nerve Cell
Carry electrical impulses
Function:
in the nervous system
Lots of dendrites to
connect to other cells,
Features: long axon to carry
impulse, nerve endings
which transmit chemical
across synapse.