Grade 9 Enzymes and their reactions 2C

Which one of the following is not true about enzymes?

• enzymes catalyse chemical reactions in living organisms

• enzymes have a certain 3D shape that is important

• enzymes get used up in a chemical reaction

• enzymes convert substrate(s )into product(s)

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur

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Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?

• reducing the number of products   
• reducing the activation energy
• increasing the temperature of the cell
• increasing the concentration of reactants 

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NGSS.HS-PS1-4

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How many different chemical reactions can a certain enzyme usually catalyse?

• a large number

• about 10

• only 1

• 3 to 4

Proteins are broken down into smaller molecules such as amino acids by what sort of enzyme?

• amylase

• protease

• nuclease

• lipase

The substance(s) that fit into the active site of an enzyme are called

• Coenzyme(s)

• Substrate(s)

• Vitamin(s)

• Polypeptide(s)

Factor(s) that can affect how an enzyme works is/are

• temperature only

• pH only

• both temperature and pH

• neither temperature or pH

The letters C and D represent

• active site and product respectively

• active site and enzyme respectively

• enzyme and product respectively

• substrate and active site respectively

In a chemical reaction, ________ are what you have at the end

• Products

• Molecules

• Reactants

• Substances

Tags

NGSS.MS-PS1-2

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A product of the chemical reaction involving fats and the lipase enzyme is

• fatty acids

• amino acids

• simple sugars like glucose

• starch