Answer Happy

SECTION B (50 Marks) Question 1 (11 marks) (a) Mention the two chemical reactions that occur in the cell and also explain how the two forms of chemical reactions in the cell work (4) (b) Explain how energy released from oxidation will be transferred for biosynthesis (3) (c) All life forms require free energy, explain why? (4) Question 2 (20 marks) (a) What are homologous chromosomes? (2) (b) Explain how the DNA is packaged within the chromosome? (5) (c) Explain why it is important that the homologous chromosomes segregate during meiosis (4) (d) Briefly discuss how the cell cycle carries out its basic functions (4) (e) Explain how the cell control system governs cell cycle progression through major regulatory transitions (5) (f) Give a brief discussion on the structural chromosome abnormality (3) Question 3 (16 marks) (a) What is the role of cyclin/CDK complex in DNA replication (2) (b) Maturation or Mitosis Promoting Factor MPF is active during which phase of the cell cycle? (2) (c) What is the role of SCF and APC/C in the cell cycle (6) (d) Mention and also give the functions of the three extracellular signal molecules that regulate cell growth, division and survival (6) END OF SECTION B..... ************