BIOLOGY- metabolism

• What is meant by metabolism?

  The sum of all chemical reactions in a cell
• How does metabolism convert between different molecules?

  By facilitating chemical reactions in cells
• What is the role of respiration in metabolism?

  It releases energy from glucose
• What is the definition of metabolism that needs to be learned?

  The sum of all chemical reactions in a cell
• What are the key reactions in metabolism involving glucose?

  • Glucose is converted into cellulose
  • Glucose is converted into starch
  • Glucose reacts with nitrate ions to make amino acids
  • Glucose is converted to glycogen in animals
• What is cellulose and its role in plant cells?

  A substance that strengthens the plant cell wall
• What is starch and its function in plant cells?

  A storage form of glucose in plants
• How is glucose used to synthesize amino acids in plants?

  By reacting with nitrate ions
• What is glycogen and its role in animals?

  A storage form of glucose in animals
• What is formed when one molecule of glycerol reacts with three fatty acids?

  A lipid molecule
• Where are lipids found in the body?

  In the cell membrane
• What happens to excess proteins in humans?

  They are broken down into urea
• How is urea excreted from the body?

  By the kidneys
• What are the main reactions of metabolism discussed in the video?

  1. Glucose to cellulose
  2. Glucose to starch
  3. Glucose with nitrate ions to amino acids
  4. Glucose to glycogen
  5. Glycerol with fatty acids to lipids
  6. Excess proteins to urea
• What should you remember to prepare for questions on metabolism?

  Details of lipid synthesis
• What is the significance of the reactions in metabolism?

  They illustrate how molecules are interconverted
• How do the reactions of metabolism relate to each other?

  They demonstrate the conversion of molecules