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Cells and DNA, Enzyme Action, Diffusion, and
Blood Circulation and the Heart…read more

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A human cell has a nucleus, cell membrane and
cytoplasm containing mitochondria
Chromosomes in the nucleus carry coded information
forming genes called DNA. This is individual for each
person
DNA is a double helix with cross links of two bases
DNA controls protein synthesis (which can be enzymes).
Each gene therefore is coded for a protein
DNA has for bases. A-T and G-C are complementary
base pairings
DNA replicates by unzipping and rebuilding by base
pairings
The base sequence determines the amino acid sequence
and the protein produced
These bases code for one amino acid…read more

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They both
have
Only
plants
Animal Cells Plant Cells
Cell
Nucleu Cytoplas membrane Cytoplas
Nucleu
s m m
s
Chloroplas
Mitochondri t
Cell Vacuol Cell
Mitochondri a
membrane e wall
a…read more

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Enzymes are proteins
Enzymes are biological catalysts. They speed up
chemical reactions in respiration and
photosynthesis
Enzymes are specific and each one can only act on
one substrate
Enzyme action is changed by pH and temperature
The best conditions are called optimum conditions
Each protein and enzyme has a different shape
resulting in different functions
Enzymes work as a `lock and key' mechanism
Enzymes are denatured by a chance in their
molecular shape caused by extremes of pH and
temperature…read more

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