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B4: The Processes Of Life
By Anokhi Patel…read more

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Life Processes
· Movement: All living things move - to find food, escape
predators or find better growing conditions.
· Respire:Getting energy from food to carry out cell processes
· Sensitivity: Detecting changes in the surroundings such as
light levels
· Growth: All living things grow.
· Reproduce:Making new generations of a species
· Excrete:Getting rid of waste - including carbon dioxide from
· Nutrition:Taking in and using food as a supply of energy.…read more

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Processes in plants.
· The cytoplasm of every cell in a plant contains a biological
chemical factory. Different chemical reactions occur that
serve different purposes. Some reactions help the plant to
repair itself, some to copy itself and some to help it grow.
Other reactions allow the plant to break down large food
molecules to release energy in respiration.…read more

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· Enzymes are catalysts that speed up chemical reactions in
living organisms
· Enzymes work best at their optimum temperature. This is
why homeostasis is important - to keep our body
temperature at a constant 37°C.
· Enzymes are proteins: large molecules made up of long
chains of amino acids
· Amino acid chains are different in each protein, so they fold
up into different shapes
· The sequence of amino acids in each enzyme is determined
by instructions in a gene…read more

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As the temperature increases, so does the rate of chemical
reaction. This is because heat energy causes more
collisions, with more energy, between the enzyme
molecules and other molecules. However, if the
temperature gets too high, the enzyme is denatured and
stops working.…read more

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How Enzymes work?
· Some enzymes break down larger molecules into smaller
· Some enzymes join small molecules together
· In order to do so the molecules need to fit inside the part
of the enzyme called the Active Site .
· This is called a Lock And Key Model…read more

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