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- 1. Multiple Choice
Define the word substrate (choose best answer):
The molecule that an enzyme acts on. It has a specific shape that fits the enzyme.
The molecule that an enzyme acts on.
The area where the molecule fits into an enzyme
The shape of the active site
- 2. Multiple Choice
Define the word "active site" (choose best answer):
The molecule that an enzyme acts on. It has a specific shape that fits the enzyme.
The molecule that an enzyme acts on.
The area where the molecule fits into an enzyme
The area where the molecule fits.
- 3. Multiple Choice
Is this a anabolic or catabolic reaction. Justify your answer.
It is a catabolic reaction, as one large substrate has been broken into two smaller products.
It is a anabolic reaction, as one large substrate has been broken into two smaller products.
It is a catabolic reaction, as two smaller substrates are made into one large product.
It is a catabolic reaction, as one large product has been broken into two smaller substrates.
- 4. Multiple Choice
Is this a anabolic or catabolic reaction. Justify your answer.
It is a catabolic reaction, as one large substrate has been broken into two smaller products.
It is a anabolic reaction, as two small substrates has been broken into one large product.
It is a anabolic reaction, as two small products has been broken into one large substrate.
It is a anabolic reaction, as one small substrate has been broken into two large products.
- 5. Multiple Choice
Define the term 'activation energy'
Activation is the minimal energy required for a reaction to happen.
Activation is the maximum energy required for a reaction to happen.
Activation is the minimal energy required for a reaction not to happen.
Is where one small substrate has been broken into two large products.
- 6. Multiple Choice
Which is statement is true?
Enzymes are biological catalysts which lower the activation energy needed to start a reaction by providing a alternative pathway
Enzymes are biological catalysts which raise the activation energy needed to start a reaction by providing a alternative pathway
Enzymes are live organisms which lower the activation energy in a pathway
Enzymes are non-biological catalysts which lower the activation energy needed to start a reaction by providing a alternative pathway
- 7. Multiple Choice
Complete this sentence:
"If enzymes lower the activation energy for a reaction,
the faster the rate. Thus enzymes speed up the reaction.
the slower the rate. Thus enzymes speed up the reaction.
the faster the rate. Thus enzymes slow down the reaction.
the faster the rate. Thus enzymes have no effect on the rate of the reaction.
- 8. Multiple Choice
Why is the 'induced fit' model for enzymes a more accepted theory than the 'lock and key' model?
Choose 2 answers!
enzymes are not ridged (like lock and key) they are flexible structures
binding of the substrate to the enzyme alters both the enzyme and the substrate, providing a better fit.
enzymes are ridged (like lock and key)
binding of the substrate to the enzyme does not alter the enzyme and the substrate, providing a better fit.
- 9. Multiple Choice
Why is the 'induced fit' model for enzymes a more accepted theory than the 'lock and key' model?
Choose 2 answers!
enzymes are not ridged (like lock and key) they are flexible structures
binding of the substrate to the enzyme alters both the enzyme and the substrate, providing a better fit.
enzymes are ridged (like lock and key)
binding of the substrate to the enzyme does not alter the enzyme and the substrate, providing a better fit.
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