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B2: Quiz 2 – Answers
B2: Quiz 2 – Answers
1) A catalyst increases the rate of reaction without being used up (the catalyst is unchanged after the reaction & free to catalyse more reactions)
2) Substrate
3) Any shaped enzyme with a labelled active site
2) Substrate
3) Any shaped enzyme with a labelled active site
4)
a) The substrate fits into the active site of the enzyme. The reaction takes place. The products are then released, and the enzyme is free to catalyse another reaction.
b) No – the catalyst does not change during the reaction
5)
a) We need enzymes to increase the number of reactions in cells to produce sufficient quantities of substances to support life (if we did not have enzymes, the temperature inside the body would be too low for a sufficient number of chemical reactions to take place to support life)
b) There are lots of different enzymes
c) The two reactions are:
- the splitting up of substances (1 substance becomes 2)
- the joining of substances (2 substances become 1)
Questions
1) An enzyme is a biological catalyst. What does “catalyst” mean?
2) What is the name of the substance that an enzyme facilitates a reaction for? It begins with s.
3) Draw a diagram of an enzyme and label any points of interest.
4)
a) Describe how an enzyme works/ describe the lock and key theory.
b) Do enzymes change in any way during reactions?
5)
a) Why do humans need enzymes?
b) Is there just one type of enzyme in the human body, or lots of different types of enzymes in the human body?
c) There are two different types of reactions that enzymes can catalyse; what are these two different types of reactions?
1) An enzyme is a biological catalyst. What does “catalyst” mean?
2) What is the name of the substance that an enzyme facilitates a reaction for? It begins with s.
3) Draw a diagram of an enzyme and label any points of interest.
4)
a) Describe how an enzyme works/ describe the lock and key theory.
b) Do enzymes change in any way during reactions?
5)
a) Why do humans need enzymes?
b) Is there just one type of enzyme in the human body, or lots of different types of enzymes in the human body?
c) There are two different types of reactions that enzymes can catalyse; what are these two different types of reactions?