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Biology Unit 2 Key Points
1. Cells
a) Animal cells
I) A nucleus to control the cells activities
II) Cytoplasm where many chemical reactions take place
III) Cell Membrane to control the movement of materials
IV) Mitochondria where energy is released during aerobic respiration
V) Ribosome's where protein synthesis happens…

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2. How Plants Produce Food
a) Photosynthesis
I) Carbon Dioxide + Water (+ Light Energy) Glucose + Oxygen
II) Carbon dioxide is taken in by the leaves and Water by the roots
III) The chlorophyll traps the energy required for photosynthesis
IV) Photosynthesis can only be carried out by green…

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III) Some is used for respiration ­ which releases energy for living processes like
movement ­ the more something moves, the more energy it uses
IV) Some animals require a constant temperature so some of the energy is used to
maintain this temperature.
c) Energy in Food Production
I) The…

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II) If the temperature gets to hot the enzymes active site changes shape and it
becomes denatured
III) Enzymes work at different PH's depending on where they are naturally found ­
if the ph is to alkali or acidic it can cause the active site to change shape
c) Aerobic…

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a) Controlling internal conditions
I) We must remove the waste products produced through chemical reactions from
the body
II) Homeostasis is the processes in the body which help to maintain a constant
internal environment
III) We have to keep our internal temperature the same as well as coping with

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I) Stem cells are unspecialised so they can develop (differentiate) into many
different types of specialised cell
II) Stem cells are found in embryos and in adult bone marrow
III) Most embryonic stem cells that we carry out research on are from aborted
embryos or spare embryos from fertility treatment…


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