Long answer IB paper questions

• Explain the advantages of having both lipids and carbohydrate as energy stores in the human body [2]

  1. Energy homeostasis

  2. Metabolic flexibility
• Outline ONE reason for humans being unable to digest cellulose [1]


  Because humans lack appropriate enzymes (cellulase) to break down cellulose
• Cellulose is the most abundant organic polymer on Earth. Describe the structure of cellulose [3]

  1. Linear chains of β-D-Glucose

  2. Hydrogen bonding

  3. Polysaccharide

  Cellulose is a linear, ribbon-shaped polymer of glucose molecules
• Unicellular and Multicellular organisms share the same functions of life. Outline FOUR functions of life [4]

  1. Metabolism

  2. Growth

  3. Reproduction

  4. Response to Stimuli
• living organisms control pH within their tissues. What is a reason for regulating pH?

  1. All parts of a body must be kept at the same pH to survive.

  2. many reactions can only happen at specific pH.

  3. pH affects osmosis

  4. a Control of active transport is achieved by pH.