STPM Trial 2009 Bio Q&A (Pahang)

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papercollection 964/1 PEPERIKSAAN PERCUBAAN SIJIL TINGGI PERSEKOLAHAN MALAYSIA NEGERI PAHANG DARUL MAKMUR 2009 BIOLOGY PAPER 1 MULTIPLE-CHOICE ONE HOUR AND FORTY-FIVE MINUTES Instructions to candidates DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO There are fifty questions in this paper. For each question, four suggested answers are given. Choose one correct answer and indicate it on the multiplechoice answer sheet provided. Read the instructions on the multiple-choice answer sheet c
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  964/1 PEPERIKSAAN PERCUBAANSIJIL TINGGI PERSEKOLAHAN MALAYSIANEGERI PAHANG DARUL MAKMUR 2009 BIOLOGYPAPER 1MULTIPLE-CHOICEONE HOUR AND FORTY-FIVE MINUTESInstructions to candidatesDO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO There are fifty questions in this paper. For each question, four suggestedanswers are given. Choose one correct answer and indicate it on the multiple-choice answer sheet provided. Read the instructions on the multiple-choiceanswer sheet carefully. Answer all questions. Marks will not be deducted for wrong answers. CONFIDENTIAL * papercollection   2  1   Which one of the following is a characteristic of saturated fats that distinguishes themfrom unsaturated fats? A They have no double bonds between their carbon atoms B They contain only unbranched fatty acids C They contain high proportion by mass of oxygen D They do not contain glycerol 2   Which part of a phospholipid molecule contributes most to the thickness of a cell surfacemembrane? A Glycerol B Hydrocarbon chain C Hydrophilic head D Phosphate group 3   What does a haemoglobin molecule contain? A Four iron (Fe 2+ ) ions attached to each haem group B Four oxygen molecules attached to each haem group C Four polypeptide chains each with four attached haem groups D Four polypeptide chains each with one attached haem group 4 Potassium cyanide is known to interfere with the formation and use of ATP in cellmetabolism. If the use of potassium cyanide resulted in an accelerated entry of a soluteinto a cell, it may be reasonably assumed that, under normal circumstances, the soluteenters by A Active transport B Osmosis C Passive diffusion D Pinocytosis papercollection   3 5   Which cell component forms pinocytic vesicles? A Lysosome B Nucloelus C Cell surface membrane D Endoplasmic reticulum 6   A culture of bacteria had their entire DNA labelled with the heavy isotope of nitrogen, 15  N. The culture was then allowed to reproduce using nucleotides containing normal 14  N.The DNA was examined using a centrifuge after one generation and again after twogenerations. The diagram shows the position of the DNA band at Z in the centrifuge tubewhen the DNA was first labelled.  XYZ In which patterns would the DNA be found after the first and after the second cellgenerations?After first generation After second generation A Half at X and half at Y Quarter at X and at Z and half at Y B Half at X and half at Z Quarter at X and at Z and half at Y C All at Y Half at X and half at Y D All at Z Half at Y and half at Z papercollection   4 7   Turgid plant tissue is placed in a solution which has the same solute potential as thecontents of the cells. The diagram shows a cell after one hour.Which equation describes the value of the pressure potential for this cell? A Pressure potential = solute potential of the cell B Pressure potential = solute potential of the external solution C Pressure potential = water potential of the cell D Pressure potential = zero 8 A metabolic pathway is shown below.Enzyme 1 Enzyme 2 Enzyme 3Reactant substance X substance Y end productWhat would be the effect of adding a small amount of a non-competitive inhibitor toenzyme 2? A Enzyme 2 would be partially denatured B Substance X would increase in concentration C Substance Y would no longer be formed D The initial reactant would no longer be metabolised papercollection 
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