U1T5 – Enzymes

Enzymes speed up chemical reactions by doing what?

Enzymes are biological catalysts: they speed up reactions. This allows the reactions to happen at...

True or False : Endothermic enzyme controlled reactions do not require activation energy?

On the above diagram, which letter represents the activation energy without an enzyme?

On the above diagram, which letter represents the product?

On the above diagram, which letter represents the activation energy with an enzyme?

Is the reaction on the above diagram exothermic or endothermic?

What substance are enzymes made out of?

What is the area of an enzyme called where the substrate binds?

Enzymes have a very specific shape. What type of bonds hold it in that shape?

What is the function of the active site?

a) To hold the substrate in such a way as to strain the bonds so they are easier to break. or
b) To hold the substrate in such a way, as to allow new bonds to form.

Which letter represents the active site in this diagram?

Which letter represents the enzyme-substrate complex in this diagram?

Looking at the shape of the substrate, which molecule could it be?

Which word best describes the shape of the substrate?

This model of enzyme action has now been replaced by another more recent one. What is the more recent model called?

Which of the following is true, in the currently accepted model of enzyme action?

A scientist measured the rate of removal of amino acids from a polypeptide with and without an enzyme present. With the enzyme present, 500 amino acids were released per second. Without the enzyme, 2.0 × 10^-8 amino acids were released per second. Calculate by how many times the rate of reaction is greater with the enzyme present.

In this reaction, what is the activation energy for the enzyme catalysed reaction?

In this reaction, what percentage difference in energy needed for an enzyme catalysed reaction, compared to an uncatalysed one?