Chemical Reactions and Enzymes

What is a competitive inhibitor?

• A competitive inhibitor is a type of enzyme that binds to a different site on the enzyme than the active site.

• A competitive inhibitor is a type of enzyme that enhances the activity of the substrate.

• A competitive inhibitor is a type of enzyme that only inhibits the activity of non-competitive inhibitors.

• A competitive inhibitor is a type of enzyme inhibitor that competes with the substrate for binding to the active site of the enzyme.

Answer explanation

A competitive inhibitor is an enzyme inhibitor that competes with the substrate for binding to the active site of the enzyme.

What type of reaction is a catabolic reaction?

• A catabolic reaction is a decomposition reaction.

• A catabolic reaction is an exothermic reaction.

• A catabolic reaction is a redox reaction.

• A catabolic reaction is a synthesis reaction.

Answer explanation

A catabolic reaction is a decomposition reaction, where substances are broken down. This is the correct choice.

What type of reaction is an anabolic reaction?

• Decomposition reaction

• Reduction reaction

• Oxidation reaction

• Synthesis reaction

Answer explanation

An anabolic reaction is a synthesis reaction where smaller molecules are combined to form larger molecules. In this case, the correct choice is 'Synthesis reaction'.

Tags

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What type of reaction is an endothermic reaction?

• An endothermic reaction is a type of reaction that occurs at extremely high temperatures.

• An endothermic reaction is a type of reaction that does not involve heat.

• An endothermic reaction is a type of reaction that releases heat to its surroundings.

• An endothermic reaction is a type of reaction that absorbs heat from its surroundings.

Answer explanation

An endothermic reaction is a type of reaction that absorbs heat from its surroundings.

What type of reaction is an exothermic reaction?

• An exothermic reaction is a reaction that releases energy.

• An exothermic reaction is a reaction that produces light.

• An exothermic reaction is a reaction that does not release energy.

• An exothermic reaction is a reaction that absorbs energy.

Answer explanation

An exothermic reaction is a reaction that releases energy.

What are enzymes?

• Enzymes are inorganic molecules that have no effect on chemical reactions.

• Enzymes are biological molecules that act as catalysts and help speed up chemical reactions in living organisms.

• Enzymes are only found in plants and not in animals.

• Enzymes are harmful substances that damage living organisms.

Answer explanation

Enzymes are biological catalysts that accelerate chemical reactions in living organisms.

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How does a competitive inhibitor affect enzyme activity?

• It increases the enzyme's activity by binding to the active site and enhancing substrate binding.

• It has no effect on the enzyme's activity.

• It completely inhibits the enzyme's activity by destroying the active site.

• It reduces the enzyme's activity by binding to the active site and preventing substrate binding.

Answer explanation

A competitive inhibitor reduces enzyme activity by binding to the active site and preventing substrate binding.

Give an example of a catabolic reaction.

• Breakdown of glucose during cellular respiration

• Formation of glycogen from glucose

• Conversion of ATP to ADP

• Synthesis of glucose during photosynthesis

Answer explanation

A catabolic reaction is the breakdown of glucose during cellular respiration. This process releases energy for the cell to use.

Tags

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Give an example of an anabolic reaction.

• Glycolysis

• Cellular respiration

• Protein synthesis

• Lipid breakdown

Answer explanation

An example of an anabolic reaction is protein synthesis, where new proteins are built. This process is essential for growth and repair in organisms.

Give an example of an endothermic reaction.

• Combustion of gasoline

• Melting of ice

• Photosynthesis

• Baking soda and vinegar reaction

Answer explanation

An example of an endothermic reaction is the baking soda and vinegar reaction. This reaction absorbs heat from the surroundings, making it endothermic.