This document contains a 45 minute exam for a Biology Standard Level Paper II. The exam contains 6 questions testing knowledge of: [1] the structure of water and functions/ions of biological elements, [2] distinguishing biology terms, [3] a table about saccharides, [4] the structure of DNA, [5] DNA replication process, and [6] central dogma of genetics and transcription/translation. The exam is scored on a scale of 1 to 7 points.

1. 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
EJE 1
All statements baccalaureate international 2011 ©

2. 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):
EJE 2
All statements baccalaureate international 2011 ©

3. 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]
EJE 3
All statements baccalaureate international 2011 ©

4. 3. Complete the table below: [8]
-saccharides examples Plant or animal? Function/ uses
animal
Mono-
plant
plant
Di-
animal
animal
Poly-
plant
4. Draw and label a simple diagram of the molecular structure of DNA. [4]
EJE 4
All statements baccalaureate international 2011 ©

5. 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)
EJE 5
All statements baccalaureate international 2011 ©

6. 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]
EJE 6
All statements baccalaureate international 2011 ©