This document provides instructions and content for a Biology Standard Level exam consisting of two papers to be taken on Tuesday, November 24, 2011. Paper I is multiple choice and contains 20 questions. Paper II involves drawing diagrams, writing word equations, listing examples, distinguishing terms, and comparing processes. It receives a higher maximum score than Paper I. The exam covers topics in chemistry, biology, genetics, and molecules.

1. Name Student:
Biology
Standard Level
Paper I & II
1 1/2 hour
Tuesday 24 Nov 2011
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
Paper I
Puntos Nota
20-20 7
19-17 6
16-14 5
13-12 4
11-8 3
7-4 2
3-1 1
Paper II
Puntos Nota
30-30 7
29-25 6
24-20 5
19-17 4
16-11 3
10-5 2
4-1 1
Paper I
1. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite
proportion by weight [1]
a. proton
EJE 1
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2. b. cation
c. ion
d. CORRECT: compound
2. An atom's central core, containing protons and neutrons. [1]
a. CORRECT: atomic nucleus
b. atomic mass
c. atomic number
d. atomic weight
3. One of two or more atoms with the same atomic number but with different numbers of neutrons. [1]
a. CORRECT: isotope
b. proton
c. atom
d. 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. electronshells
b. molecule
c. structural formula
d. CORRECT: molecular formula
5. Lipids are made of these elements... (in alphabetical order separated by commas) [1]
a. CORRECT: carbon, hydrogen
b. unsaturated
c. energy
d. cellmembrane
6. The number of protons in an atom. [1]
a. Atom
b. ionic bond
c. CORRECT: Atomic number
d. Atomic Mass
7. Substance formed by two or more elements in definite proportions (ex. water, carbon dioxide) [1]
a. CORRECT: compound
b. Atom
c. ion
d. molecule
8. The total number of protons and neurtrons. [1]
a. Atomic number
b. Atom
c. CORRECT: Atomic Mass
d. 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. compound
b. element
c. CORRECT: molecule
d. Isotope
10. The process of making an RNA copy of one gene. [1]
a. CORRECT: Transcription
b. Trait
c. Translation
d. Replication
11. A single chain of amino acids. [1]
a. Helicase
b. CORRECT: Polypeptide
c. Replication
EJE 2
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3. d. Enzyme
12. RNA that carries information from the nucleus to the ribosomes. [1]
a. rRNA
b. RNA
c. tRNA
d. CORRECT: mRNA
13. RNA that carries amino acids to ribosomes. [1]
a. rRNA
b. CORRECT: tRNA
c. RNA
d. mRNA
14. The enzyme which puts together the nucleotides in DNA replication [1]
a. CORRECT: DNA Polymerase
b. RNA Polymerase
c. Helicase
d. Polypeptide
15. A two-stranded nucleic acid that holds genetic information for the long-term [1]
a. CORRECT: DNA
b. rRNA
c. mRNA
d. RNA
16. DNA to RNA to Proteins. [1]
a. Translation
b. CORRECT: Central Dogma of Biology
c. Point Mutation
d. ChromosomalMutations
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: anticodon
b. Codon
c. Mutation
d. histone
18. The "Building blocks" of proteins. [1]
a. anticodon
b. CORRECT: amino acids
c. Mutation
d. Translation
19. Enzyme responsible for adding complementary base pairs and proofreads the new double stranded DNA.
[1]
a. helicase
b. DNA replication
c. RNA polymerase
d. CORRECT: DNA polymerase
20. Process where DNA codes for RNA in the nucleus of a cell. [1]
a. CORRECT: Transcription
b. Point Mutation
c. anticodon
d. Translation
Paper II
1.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]
EJE 3
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4. 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]
EJE 4
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5. (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]
EJE 5
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6. (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]
EJE 6
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