B4 -Processes of life

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:

-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…