B9.4 - Metabolism And The Liver (Finished)

Question 1

What is the metabolism of an organism?

Answer 1

Metabolism is the sum of all reactions that take place in a cell or in the body

Question 2

Give two examples of a metabolic reaction where larger molecules are broken down?

Answer 2

• Glucose broken down in respiration

- Excess protein broken down to produce urea

Question 3

Give 3 examples of metabolic reactions where larger molecules are made from smaller ones?

Answer 3

• Lots of small glucose molecules being joined together to form starch(plants) or glycogen (animals) or cellulose
• Lipid molecules being made from a molecule of glycerol and three fatty acids
• Glucose combined with nitrate ions to form amino acids to make proteins

Question 4

Where is energy for the enzyme controlled process of metabolism supplied from?

Answer 4

Energy transferred by respiration

Question 5

Most chemical reaction in the body are ___

Answer 5

Enzyme-controlled

Question 6

What are some examples of metabolic functions of the liver?

Answer 6

• Detoxifying poisonous substances such as ethanol
• Passing breakdown products into blood to be excreted in the urine
• Breaking down old, word out blood cells and storing the iron to synthesise more blood cells