EJE 1 All statements baccalaureate international 2011 ©

Name Student:

Biology Standard Level Paper II 45 min Tuesday 15 Feb 2012

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 Answer all in the spaces provided. Use pen only Use clear handwriting Banda

Puntos Nota 41-50 7 36-40 6 31-35 5 26-30 4 20-25 3 10-19 2

1-9 1

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Paper II 1.

(a) Draw and label a diagram showing the structure of water molecules to show their polarity and hydrogen bond formation. [4]

(b) State the functions and ions of the elements found in living organisms. [7]

Symbol: Ion: Function(s):

Symbol: Ion: Function(s):

Symbol: Ion: Function(s):

Symbol: Ion: Function(s):

Symbol: Ion: Function(s):

Symbol: Ion: Function(s):

Symbol: Ion: Function(s):

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2.Distinguish between the following pairs of words. (a) Protein and polypeptide [1]

(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]

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3. Complete the table below: [8]

-saccharides examples Plant or animal? Function/ uses

Mono-

animal

plant

Di-

plant

animal

Poly- animal

plant

4. Draw and label a simple diagram of the molecular structure of DNA. [4]

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5. Explain the process of DNA Replication:

(a) DNA Helicase unwinds and unzips the DNA double helix: (4)

(b) DNA polymerase creates complementary strands: (4)

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6. Describe why DNA replication is considered ‘semi-conservative’. (4)

5.

(a) State the central dogma of genetics. (1)

(b) Transcribe and translate this DNA sequence. (4)

DNA T A C G G G C C C G T G A C A G C C A C T

mRNA

Amino acid

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