Name Student:

Biology Standard LevelPaper I & II

1 1/2 hour

Tuesday 24 Nov 2011

INSTRUCTIONS TO CANDIDATESDo 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 choiceAnswer all in the spaces provided.Use pen onlyUse clear handwriting

Paper I

Paper II

Paper I1. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite

proportion by weight [1]a. proton

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Puntos Nota20-20 719-17 616-14 513-12 411-8 37-4 23-1 1

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b. cationc. iond. CORRECT: compound

2. An atom's central core, containing protons and neutrons. [1]a. CORRECT: atomic nucleusb. atomic massc. atomic numberd. atomic weight

3. One of two or more atoms with the same atomic number but with different numbers of neutrons. [1]a. CORRECT: isotopeb. protonc. atomd. ion

4. A chemical formula that shows the number and kinds of atoms in a molecule, but not the arrangement of the atoms. [1]a. electron shellsb. moleculec. structural formulad. CORRECT: molecular formula

5. Lipids are made of these elements... (in alphabetical order separated by commas) [1]a. CORRECT: carbon, hydrogen

b. unsaturatedc. energyd. cell membrane

6. The number of protons in an atom. [1]a. Atomb. ionic bondc. CORRECT: Atomic numberd. Atomic Mass

7. Substance formed by two or more elements in definite proportions (ex. water, carbon dioxide) [1]a. CORRECT: compoundb. Atomc. iond. molecule

8. The total number of protons and neurtrons. [1]a. Atomic numberb. Atomc. CORRECT: Atomic Massd. ionic bond

9. The smallest part of a compound (water is made up of 2 molecules of hydrogen and one molecule of Oxygen) [1]a. compoundb. elementc. CORRECT: moleculed. Isotope

10. The process of making an RNA copy of one gene. [1]a. CORRECT: Transcriptionb. Traitc. Translationd. Replication

11. A single chain of amino acids. [1]a. Helicaseb. CORRECT: Polypeptidec. Replication

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d. Enzyme12. RNA that carries information from the nucleus to the ribosomes. [1]

a. rRNAb. RNAc. tRNAd. CORRECT: mRNA

13. RNA that carries amino acids to ribosomes. [1]a. rRNAb. CORRECT: tRNAc. RNAd. mRNA

14. The enzyme which puts together the nucleotides in DNA replication [1]a. CORRECT: DNA Polymeraseb. RNA Polymerasec. Helicased. Polypeptide

15. A two-stranded nucleic acid that holds genetic information for the long-term [1]a. CORRECT: DNAb. rRNAc. mRNAd. RNA

16. DNA to RNA to Proteins. [1]a. Translationb. CORRECT: Central Dogma of Biologyc. Point Mutationd. Chromosomal Mutations

17. The anticodon region of a transfer RNA is a sequence of three bases that are complementary to a codon in the mRNA. [1]a. CORRECT: anticodonb. Codonc. Mutationd. histone

18. The "Building blocks" of proteins. [1]a. anticodonb. CORRECT: amino acidsc. Mutationd. Translation

19. Enzyme responsible for adding complementary base pairs and proofreads the new double stranded DNA. [1]a. helicaseb. DNA replicationc. RNA polymerased. CORRECT: DNA polymerase

20. Process where DNA codes for RNA in the nucleus of a cell. [1]a. CORRECT: Transcriptionb. Point Mutationc. anticodond. Translation

Paper II1. Draw and label a diagram showing the structure of water molecules to show their polarity and hydrogen bond formation. (Draw means to represent by means of pencil lines and labels means to add labels to a diagram.) [4]

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2. Explain the importance of the transparency of water to life. [2]

3. List three examples each of monosaccharides, disaccharides and polysaccharides. [3] (List means to give a sequence of names or other brief answers with no explanation.)

4. Distinguish between the following pairs of words.

(a) Protein and polypeptide [1]

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(b) Fat and oil [1]

(e) Starch and glycogen [1]

(d) Condensation and hydrolysis [1]

(e) Hydrophobic and hydrophilic. [1]

(f) Organic and inorganic compounds [1]

5. Write a word equation for each of the following.

(a) hydrolysis of maltose [1]

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(b) the condensation reaction that forms a triglycerides [1]

(e) hydrolysis of starch to remove a single molecule. [1]

6. Draw and label a simple diagram of the molecular structure of DNA. [4] (Draw means to be able to represent by means of pencil lines.)

7. Compare transcription and translation [4]

8. Determine two possible DNA sequences that could code for: Phe-ile-Val-Leu. [4]

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