metabolism

• What is meant by metabolism?

  Metabolism is the sum of all the chemical reactions in a cell or the body.
• How does metabolism convert between different molecules?

  Metabolism converts molecules through various chemical reactions, such as respiration and synthesis.
• What is the role of respiration in metabolism?

  Respiration is a chemical reaction that releases energy from glucose.
• What is the significance of glucose in metabolism?

  Glucose is a key molecule that releases energy and serves as a starting point for synthesizing new chemicals.
• What are the products formed from glucose in plant cells?

  • Cellulose (strengthens plant cell wall)
  • Starch (storage form of glucose)
  • Amino acids (reacted with nitrate ions to synthesize proteins)
• How is glucose converted in humans and other animals?

  In humans and other animals, glucose is converted to glycogen, which is a storage form of glucose.
• What is glycogen?

  Glycogen is a storage form of glucose in humans and other animals.
• What is the reaction that forms a lipid molecule?

  One molecule of glycerol reacts with three molecules of fatty acids to form a lipid molecule.
• Where are lipids found in the body?

  Lipids are found in the cell membrane.
• What happens to excess proteins in humans?

  Excess proteins are broken down into urea, which is then excreted by the kidneys.
• What is urea?

  Urea is a chemical produced from the breakdown of excess proteins.
• What are the key reactions in metabolism discussed in the video?

  1. Glucose to cellulose
  2. Glucose to starch
  3. Glucose to amino acids (with nitrate ions)
  4. Glucose to glycogen
  5. Glycerol and fatty acids to lipids
  6. Excess proteins to urea