gce winter 2010 - question paper - KCSE Online

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4 Examiner only 2. Fill in the gaps in the following passage. The specific immune response is triggered by the introduction into the body of large foreign molecules called ................................................................................ The body’s defence depends upon two types of ............................................................................... referred to as B and T cells. The B cells are formed in the ............................................................................... and multiply rapidly in response to infection, forming plasma cells. These produce specific ...............................................................................molecules which are secreted into the blood stream as antibodies. In addition to plasma cells, the B cells form .............................................................................. cells which remain in the bloodstream, ready to proliferate if the same infection occurs in the future. The T cells mature in the ............................................................................... gland and retain their antibody on the cell surface. They are responsible for what is known as ............................................................................... immunity. If a virus infects body cells, the T cells carrying the antibody for that virus multiply rapidly to form a ............................................................................... . Some of these eliminate the virus by causing ............................................................................... of the infected cell and these T cells are called ............................................................................... cells. Other cells known as ............................................................................... cells, stimulate B cells to divide and form plasma cells. (Total 11 Marks) (314-01)
5 Examiner only 3. The following diagram is of a photosystem. (a) (i) Identify regions A and B shown on the diagram. [2] A ........................................................................ B ........................................................................ (ii) Identify two pigments that you would expect to find in region A. [2] 1. ................................................................................................................................................................................ 2. ................................................................................................................................................................................ (iii) Describe exactly where you would expect to find photosystems. [2] ......................................................................................................................................................................................................... ......................................................................................................................................................................................................... (314-01) Turn over.
Page 1 and 2: Candidate Name Centre Number 2 Cand
Page 3: 3 Examiner only (b) NAD is a compou
Page 7 and 8: 7 Examiner only (iii) Draw the resu
Page 9 and 10: 9 Examiner only (iii) Draw a line o
Page 11 and 12: 11 Examiner only (c) Suggest an exp
Page 13 and 14: 13 Examiner only (iv) Using the inf
Page 15 and 16: 15 Examiner only ..................

gce winter 2010 - question paper - KCSE Online

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