Edexcel GCSE Biology 2BIO1 - Unit B2 Topic 1

Class notes for the 2011 Edexcel GCSE

Biology Unit B2 Topic 1 - The building blocks of life

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  • Created on: 16-10-12 13:22
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Biology 2BIO1 B2 Topic 1
B1
Biology Cells
B2 Topic 1 DNA
Enzymes
Topic 2
Science B3 Topic 3
Chemistry
Physics
Cells - basic units of life in which many chemical reactions needed to sustain
life.
1

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Biology 2BIO1 B2 Topic 1
Complete the diagrams - adding notes on
the functions of each organelle
2…read more

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Biology 2BIO1 B2 Topic 1
Mitochondria Organelles in which respiration takes place.…read more

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Biology 2BIO1 B2 Topic 1
Bacterial Cells
Bacteria are single celled organisms that are much
smaller than animal or plant cells.
Describe the function of the components of the bacterial cell
Chromosomal DNA - giant loop of DNA contains most of the genetic
material it is not neatly packaged inside a nucleus.…read more

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Biology 2BIO1 B2 Topic 1
Microscopes
Microscopes are used to magnify small 'stuff' and allow us
to study them in detail.
Electron microscope
Light microscope
· x2000000
· x1500 (combination of
· invented in 1930's
eye piece and objective
lens) · uses beams of
· require light to reflect off electrons
the specimen · 3D image
· 2D image
Under an electron
Under a light microscope microscope the average
the average person person appears 3333km
appears 2.…read more

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Biology 2BIO1 B2 Topic 1
What are the advantages of the electron microscope compared
to a light microscope?
A specimen appears 1 mm in length under the light microscope
at a magnification of 1500×. What is its actual length?
What length would the specimen in part a appear under the
maximum magnification of an electron microscope?
Explain the importance of the development of light and electron
microscopes.
Bacterial cells are much smaller than plant and animal cells.…read more

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Biology 2BIO1 B2 Topic 1
Stem Cells
7…read more

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Biology 2BIO1 B2 Topic 1
8…read more

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Biology 2BIO1 B2 Topic 1
B1
Biology Cells
B2 Topic 1 DNA
Enzymes
Topic 2
Science B3 Topic 3
Chemistry
Physics
9…read more

Page 10

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Biology 2BIO1 B2 Topic 1
DNA Molecule
Genes contain
different combinations
of the 4 nucleotides
Label the diagram
10…read more

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