Metabolism

• How does metabolism convert between different molecules?

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

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

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

  • Glucose is converted into cellulose in plants.
  • Glucose is converted into starch for storage in plants.
  • Glucose reacts with nitrate ions to form amino acids in plants.
  • Glucose is converted to glycogen in humans and animals.
• What is cellulose and its role in plant cells?

  A chemical 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 humans and animals?

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

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

  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
• How do the reactions of metabolism relate to each other?

  They involve conversion of glucose into various products