BioHL P1 N05 - 'o L 1 hour IB DIPLOMA PROGRAMME PROGRAMME...

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IB DIPLOMA PROGRAMME 'Lo PROGRAMME DU DIPLOME DU BI - - PROGRAMA DEL DIPLOMA DEL BI BIOLOGY HIGHER LEVEL PAPER 1 Thursday 10 November 2005 (afternoon) 1 hour INSTRUCTIONS TO CANDIDATES Do not open this examination paper until instructed to do so. Answer all the questions. For each question, choose the answer you consider to be the best and indicate your choice on the answer sheet provided.
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8805-6001 – 2 – N05/4/BIOLO/HPM/ENG/TZ0/XX+ 1. In an electron micrograph, a DNA molecule appears 1 mm wide. The magnifcation oF the micrograph is 500 000. What is the width oF the DNA molecule? A. 0.5 nm B. 2 nm C. 0.5 l m D. 2 l m 2. What is a Function oF the bacterial cell wall? A. Absorption oF glucose by active transport B. Exchange oF plasmids between cells C. Increasing the surFace area For oxygen diFFusion D. Preventing internal pressures From bursting the cell 3. Colchicine is a chemical substance that prevents the Formation oF microtubules. What stage oF mitosis would be prevented, iF dividing cells were treated with colchicine? A. Breaking down oF the nuclear membrane B. Replication oF DNA C. Separation oF genetically identical chromosomes (chromatids) D. Supercoiling oF chromosomes 4. What is a consequence oF hydrogen bonding between water molecules? A. Water is able to evaporate easily. B. Water is transparent. C. Water can dissolve carbohydrates, lipids and proteins. D. Ice melts and water boils at relatively high temperatures.
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8805-6001 – 3 – Turn over N05/4/BIOLO/HPM/ENG/TZ0/XX+ 5. Which is the structure of a dipeptide? A. B. C. D. 6. Which substance is a base that is found in DNA? A. Adenosine B. Cytokinin C. Guanine D. Uracil 7. Which processes involve the unwinding (uncoiling) of the DNA double helix and its separation into two strands of nucleotides? A. Replication and telophase of mitosis B. Telophase of mitosis and translation C. Translation and transcription D. Transcription and replication 8. What is a possible consequence of two base substitution mutations occurring in the same gene? A. Two amino acids coded for by the gene are changed. B. Amino acids in two polypeptides coded for by the gene are changed. C. All of the codons between the two mutations are changed. D. All of the codons from the Frst mutation onward are changed.
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8805-6001 – 4 – N05/4/BIOLO/HPM/ENG/TZ0/XX+ 9. If a person inherited an allele with the same base substitution mutation from both parents, what sequences could be altered from normal in the person’s cells? A. One mRNA base sequence only B. Two mRNA base sequences only C. One mRNA base sequence and one polypeptide amino acid sequence only D. Two mRNA base sequences and two polypeptide amino acid sequences only 10. What is Mendel’s Law of Segregation? A.
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This note was uploaded on 03/05/2010 for the course IB IB taught by Professor Unknown during the Spring '10 term at École Normale Supérieure.

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BioHL P1 N05 - 'o L 1 hour IB DIPLOMA PROGRAMME PROGRAMME...

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