2015 HCI H1 Biology Prelims P2 Questions

CANDIDAT CENTRE N BIOLOG Paper 2 C Additional INSTRUCT Write your SECTION This sectio Write your SECTION This sectio Your answ Write your BEGIN EA A NIL RET INFORMA The numbe end of eac The use of expected, w you do not appropriate You are re clear prese HWA CHO JC2 Preli Higher 1 TE NAME NUMBER GY Core Paper Materials: TIONS TO C name and A on contains answers on B on contains wers must be answers on ACH PART TURN is req ATION FOR er of marks ch question f an approp where appr t show work e units. eminded of t entation in y ONG INST minary Ex Writing Pa CANDIDAT CT group four questi n the lines / two questio e in continu n the writing ON A FRES quired for qu CANDIDAT is given in or question riate scient ropriate. Yo king or if you the need fo your answe This d TITUTION xaminatio per TES in the space ions. Answ / in the spac ons. Answe uous prose, g paper pro SH SHEET uestions no TES brackets [ n part. ific calculato ou may lose u do not use r good Eng rs. document c n es provided wer ALL que ces provide er any one q where app ovided. T OF WRITI ot answered ] at the or is marks if e lish and consists of 1 IN NU d at the top estions. ed. question. ropriate. NG PAPER . 14 printed p C T DEX UMBER of this cove R. pages. For Questi 1 2 3 4 5 / 6 Tota T GROUP 8 27 Au er page. r Examiner ion M 6 al 14S ___ 8875 / 02 ugust 2015 2 hours rs' Use Marks / 9 / 9 / 10 / 12 / 20 / 60 9 9 0 2 0 0

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3 © Hwa Chong Institution 2015 8875 H1 Biology / Preliminary Exam / Paper 2 (b) Discuss the advantages of having four subunits in haemoglobin. [3] The Greylag goose and the Andean goose have different haemoglobin structures. Possession of a haemoglobin with high oxygen affinity helps the A ndean goose to adapt to high altitudes. Greylag goose lives in the Indian plains, whereas t he Andean goose lives in the High Andes. The haemoglobin of the Andean goose differs from that of the Greylag goose by nine replacements in the -chain and seven in the -chain. (c) Explain how the differences in haemoglobin structure of the Greylag and Andean geese contribute to their different oxygen affinities. [4] [Total: 9]

4 © Hwa Chong Institution 2015 8875 H1 Biology / Preliminary Exam / Paper 2 QUESTION 2 St