Lesson 3: Metabolism

Question 1

What is the definition of metabolism?

Answer 1

• Metabolism is the sum of all the reactions in a cell or the body.

Question 2

How is the energy released from respiration used in chemical reactions?

Answer 2

• The energy is used by the organism for the continual enzyme- controlled process of metabolism that synthesize new molecules.

Question 3

Give 5 examples of metabolism.

Answer 3

• respiration
• Conversion of glucose to starch, glycogen and cellulose.
• Formation of lipid molecule from a molecule of glycerol and 3 molecules of fatty acids.
• the use of glucose and nitrate ions to form amino acids which in turn are used to synthesise proteins
• Breakdown of excess proteins to form urea for excretion (by the kidneys.)

Question 4

Where are lipids found?

Answer 4

• In the cell membrane.