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Maggle11

Biology revision

QuestionAnswer
Name a substance that diffuses into body cells Oxygen, glucose
Name a substance that diffuses out of body cells Carbon dioxide
What is the definition of diffusion? Diffusion is the movement of molecules down a concentration gradient.
Is diffusion active or passive? passive
Is osmosis active or passive passive
Osmosis is the diffusion of what? water
What is the definition of osmosis? The movement of water down a concentration gradient through a selectively permeable membrane.
What word is used to describe plant cells that have gained water by osmosis? Turgid
What word is used to describe plant cells that have lost water by osmosis? Plasmolysed
What is the definition of active transport? The movement of molecules or ions against a concentration gradient.
Does active transport require energy? yes
Does active transport need a membrane protein? yes
Does diffusion require a membrane protein? No
Does diffusion require energy? No
Name an ion that moves by active transport. Potassium (or sodium)
What are the building blocks of proteins called? Amino acids
What is the name for an enzyme controlled reaction that builds smaller molecules into bigger ones. Synthesis reaction
What is the name for an enzyme controlled reaction that breaks big molecules down to smaller ones. Degradation reaction
What do enzymes do? Speed up chemical reactions.
Are enzymes re-useable Yes
What is the name for the part of the enzyme where the reaction takes place? Active site
What is the name for the substance(s) that binds to the enzyme for the reaction to take place? Substrate
Created by: nscobie
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