4.3.1 Metabolic Reactions

• What are metabolic reactions defined as?

  Chemical reactions in organisms
• Anabolic reactions release energy.

  False
• Catabolic reactions require energy input.

  False
• Steps to differentiate between catabolic and anabolic reactions

  1️⃣ Direction: Catabolic reactions break down complex molecules, while anabolic reactions build them up.

  2️⃣ Energy: Catabolic reactions release energy, while anabolic reactions require energy.

  3️⃣ Examples: Catabolic reactions include digestion, while anabolic reactions include protein synthesis.
• Anabolic reactions are exergonic.

  False
• Catabolic reactions are exergonic and release energy
• What is the role of catabolic reactions in the body?

  Release energy
• What is a key characteristic of enzymes compared to other catalysts?

  Highly specific to substrates
• Enzymes are moderately efficient compared to other catalysts.

  False
• ATP is the primary energy currency
• What is the role of ATP in anabolic reactions?

  Provides energy
• ATP provides the energy required to drive anabolic reactions.
• Through what processes is ATP produced?

  Cellular respiration
• Anabolic reactions build up complex molecules from simpler ones
• What is the role of anabolic reactions in metabolism?

  Build complex molecules
• Catabolic reactions release energy
• What is the direction of catabolic reactions?

  Break down complex molecules
• What is an example of an anabolic reaction?

  Protein synthesis
• Catabolic reactions require energy input.

  False
• Enzymes lower the activation energy
• What is an example of an enzyme in saliva?

  Amylase
• ATP powers anabolic reactions by releasing energy.


  True
• What is ATP called in living cells?

  Primary energy currency
• ATP transports energy released from catabolic reactions to where it is needed in the cell.


  True
• Metabolic reactions require either energy input or release.


  True
• What type of metabolic reactions are destructive and break down complex molecules?

  Catabolic reactions
• Enzymes lower the activation energy required for metabolic reactions.
• ATP is essential for muscle contraction and nerve transmission.


  True
• How does enzyme concentration affect metabolic reaction rates?

  Increases reaction rate
• Catabolic reactions release energy and are exergonic reactions.
• Enzymes are highly specific to their substrates.

  True
• What forms when ATP releases a phosphate group?

  ADP
• Match the metabolic reaction with its example:

  Anabolic ↔️ Protein synthesis

  Catabolic ↔️ Cellular respiration
• Metabolic reactions occur fastest at an optimal temperature.