Understanding Enzymes and Their Functions

What is an enzyme?

• A protein that speeds up chemical reactions

• A carbohydrate that provides energy

• A lipid that stores energy

• A nucleic acid that stores information

What is the function of the active site in an enzyme?

• To store energy

• To bind with substrates and catalyze reactions

• To inhibit reactions

• To break down the enzyme

Which of the following best describes the specificity of an enzyme for its substrate?

• Any enzyme can bind to any substrate

• Enzymes are specific for their substrates based on shape compatibility

• Enzymes and substrates are compatible if they share similar charges

• Enzymes change their shape to fit any substrate

What is meant by the term ‘activation energy’?

• The energy needed to form bonds

• The energy required to start a reaction

• The energy enzymes need to function

• The energy produced by a reaction

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Which of the following is NOT a factor affecting enzyme activity?

• Temperature

• pH level

• Substrate concentration

• Color of the enzyme

What happens to an enzyme when it is denatured?

• It speeds up its activity

• It changes shape and loses its function

• It becomes more specific to its substrate

• It stores more energy

Which of the following is a common model used to describe enzyme-substrate interaction?

• Lock and key model

• Fluid mosaic model

• Induced fit model

• Sliding filament model

How do enzymes affect the activation energy of a reaction?

• They increase the activation energy

• They decrease the activation energy

• They have no effect on activation energy

• They convert activation energy into kinetic energy

What is a cofactor in relation to enzyme activity?

• A protein that inhibits enzyme activity

• A non-protein molecule that assists enzyme function

• A lipid that stores energy for enzymes

• A carbohydrate that provides energy to enzymes

Which of the following statements is true about enzymes?

• Enzymes are consumed in the reactions they catalyze

• Enzymes can be reused multiple times

• Enzymes work best at any temperature

• Enzymes are only found in animal cells