B4 -Processes of life

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  • Created by: Sandra
  • Created on: 13-01-13 10:48

Processes Of Life

-The basic processes of life carried out by all living things depend on chemcial reactions within cells that require energy released by RESPIRATION.

-Photosynthesis as a series of chemical reactions that release energy by breaking down large food molecules in all living cells.

-Enzymes are proteins that speed up chemical reactions.

-Cells make enzymes according to the instructions carried in genes.

-Molecules have o be the correct shape to fit into the active site of the enzyme.

-Enzymes need a specific constant temperature to work at their optimum and that they permanently stop working (denature)  if the temperature is too high.

-At extrene high temperatures changes the active site;as temperature increases rates of reactions increases

-Enzymes work at its optimum at a  specific pH

-Photosynthesis word and balanced symbol equation:

photosynthesis equation (http://msthomas79.edublogs.org/files/2010/01/photosynthesis-equation.gif)

-Main stages of photosynthesis:

  • light energy absorbed by the green chemical chlorophyll
  • energy used to bring about the reaction between carbon dioxide and water to produce glucose
  • oxygen produced as a waste product

Glucose may be :

  • converted into chemicals needed for growth of plant cells,e.g protein cellulose,chlorophyll
  • converted into starchb for storage.
  • used in respiratikon to release energy

Plants have :

  • chloroplasts contain chorophyll and the enzymes for reactions in photosynthesis.
  • cell membrane allows gases and water to pass in and out of the cell freely while presenting a barrier to other chemicals.
  • nucleus contains DNA which carriers the genetic code for making enzymes and other proteins used in the chemical reactions in photosynthesis.
  • cytoplasm where enzymes and…


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