CONTENTS Exam Tips
i
Mock exam
1
Mock exam memo
12
November 2011 exam
17
November 2011 memo
30
November 2010 exam
40
November 2010 memo
54
Feb/March 2010 supplementary exam
66
Feb/March 2010 memo
79
November 2009 exam
89
November 2009 memo
102
Feb/March 2009 supplementary exam
112
Feb/March 2009 memo
128
November 2008 exam
140
November 2008 memo
156
Exam Timetable
169
LIFE SCIENCES PAPER 1
MOCK EXAM
LIFE SCIENCES PAPER 1: MOCK EXAM © EDUCATIONAL IMPROVEMENT AND STUDY HELP (THE EISH-TEAM)
QUESTION PAPER
LIFE SCIENCES MOCK EXAM PAPER ONE MARKS: 150 TIME: 2½ hours
MARKS: 150
TIME: 2.5 hours
INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1.
Answer ALL the questions.
2.
Write ALL the answers in the ANSWER BOOK.
3.
Start EACH question on a NEW page.
4.
Number the answers correctly according to the numbering system used in this question paper.
5.
If answers are NOT presented according to the instructions of each question, candidates will lose marks.
6.
ALL drawings should be done in pencil and labelled in blue or black ink.
7.
Draw diagrams and flow charts ONLY when requested to do so.
8.
The diagrams in this question paper may NOT necessarily be drawn to scale.
9.
The use of graph paper is NOT permitted.
10.
Non-programmable calculators, protractors and compasses may be used.
11.
Write neatly and legibly.
1
LIFE SCIENCES PAPER 1 • MOCK EXAM
SECTION A QUESTION 1 1.1 Various possible options are provided as answers to the following questions. Choose the correct answer. 1.1.1
1.1.2
Replication of DNA takes place during. . . A.
crossing over/synapsis
B.
interphase
C.
prophase
D.
karyokinesis
Which of the following characteristics is not an inherited trait? A.
weak eyesight
B.
height
C.
pierced ears
D.
baldness
1.1.3 The development of which characteristic relates more to the cultural evolution of humans rather than the physical evolution of humans? A.
development of bipedalism
B.
development of a burial ritual
C.
working in a social unit
D.
evolution of a communication system
1.1.4 Scientists today do not accept Lamarck’s theory of evolution. The main reason for this is. . . A.
Darwin claimed that Lamarck was wrong.
B.
changes to the phenotypes of adult organisms cannot be passed on to
offspring. C.
traits developed by adult organisms are inherited by offspring.
D.
giraffes that stretched their necks to reach higher trees will pass this gene to
their offspring.
2
1.1.5
Which of the following diagrams shows nucleotides correctly joined together?
LIFE SCIENCES PAPERWhich 1 • MOCK 1.1.5 of EXAM the following diagrams shows nucleotides correctly joined together?
1.1.5
Which of the following diagrams shows nucleotides correctly joined together?
1.1.5
Which of the following diagrams shows nucleotides correctly joined together?
[5 x 2 = 10] [5 x 2 = 10] 1.2
[5 x 2 = 10] Give the correct biological term for each of the following descriptions.
1.2 1.2.1
Give the correct biological termwhich for each of thethe following [5 x 2 translation. = 10] The organelle in the cytoplasm decodes mRNA descriptions. during
1.2 Give the correct biological term for each of the following descriptions. 1.2.2 The The organelle process whereby the genetic code is copied from DNA to mRNA. 1.2.1 in the cytoplasm which decodes the mRNA during translation. 1.2.3 The The organelle theory that with favourable traitsthe are theDNA most to survive and 1.2.2 process whereby the genetic code is copied from tolikely mRNA. 1.2.1 inindividuals the cytoplasm which decodes mRNA during translation. 1.2 Give the correct biological term for each of the following descriptions. reproduce pass onindividuals thosethe traits. 1.2.3 theory that with favourable traits are theDNA mosttolikely to survive and 1.2.2 The and process whereby genetic code is copied from mRNA. 1.2.1 The organelle in the cytoplasm whichindecodes the mRNA during translation. 1.2.4 change in the genetic information an individual. reproduce and pass onindividuals those traits. 1.2.3 A The theory that with favourable traits are the most likely to survive and 1.2.2 The process whereby genetic in code is copied from DNA to mRNA. 1.2.5 This type ofingene is notthe expressed ainheterozygote. 1.2.4 A change the genetic information an individual. reproduce and pass on those traits.
1.2.3 The The kind theory that individuals with favourable traits are the most likely to survive and 1.2.6 occurs when a population 1.2.5 type of ofinspeciation gene is notthat expressed in ainheterozygote. 1.2.4 This A change the genetic information an individual. is split for some reason. reproduce and pass on those traits. [6]reason. 1.2.6 kind of occurs in when a population is split for some 1.2.5 The This type of speciation gene is notthat expressed a heterozygote. 1.2.4 A change in the genetic information in an individual. [6]reason. 1.2.6 The kind of speciation that occurs when a population is split for some 1.2.5 This type of gene is not expressed in a heterozygote. [6] 1.2.6 The kind of speciation that occurs when a population is split for some 1.3 Choose an item from Column B that matches a description in Columnreason. A. 1.3 1.3 1.3.1 1.3 1.3.1 1.3.2 1.3.3 1.3.1 1.3.2 1.3.3 1.3.4 1.3.2 1.3.1 1.3.5 1.3.3 1.3.4 1.3.2 1.3.5 1.3.4 1.3.3 1.3.5 1.3.4 1.3.5
1.4
[6] Choose an item from Column B that matches a description in Column A. COLUMN A item from Column B that matches a description COLUMN B Choose an in Column A. the nucleic acid which carries an amino acid and is A. DNA COLUMN A translation process COLUMN B used in the Choose an item from Column B that matches a description in Column A. the position nucleic acid which carries an amino acid and is B. A. genotype DNA the COLUMN A of a gene on a chromosome COLUMN B used in the translation process a genotype having non-identical a and is C. heterozygous the nucleic acid which carries an genes amino for acid A. DNA the position of a gene on a chromosome B. genotype specific characteristic used in the translation process COLUMN A having COLUMN B a genotype non-identical genes for a C. locus heterozygous the expression of a genes D. the physical position of a gene on chromosome B. genotype the nucleic acid which carries an amino acid and is A. DNA specific characteristic the gene in ahaving gene non-identical pair that determines theaeffect E. a genotype genes for C. phenotype heterozygous used ingene the translation thethe physical expressionprocess of genes D. locus of pair specific characteristic the position ofgene a gene onthat a chromosome B. genotype gene in a pair determines the effect E. tRNA phenotype F. the physical expression of genes D. locus a genotype having non-identical genes for a C. heterozygous of the gene pair G. dominant the gene in a gene pair that determines the effect E. phenotype specific characteristic F. tRNA H. homozygous of the gene pair the physical expression of genes D. locus F. tRNA the gene in a gene pair that determines the effect E. phenotype of the gene pair F. tRNA Study the diagram below and answer the questions that follow.
3
[5]
G. dominant H. homozygous
[5]
LIFE SCIENCES PAPER 1 • MOCK EXAM
1.4
Study the diagram below and answer the questions that follow.
1.4.1
Identify the type of cell division illustrated.
1.4.2
Identify the stage of cell division illustrated.
1.4.3
Identify ‘c.
1.4.4
Identify ‘d’.
1.4.5
Identify ‘e’.
1.4.6
Identify ‘f’.
1.4.7
Which stage follows the one illustrated?
1.4.8
What is the purpose of the mechanism happening at ‘d’?
1.4.9
Is the cell illustrated haploid or diploid? [9]
1.5 The diagram shows the pedigree (family history) of two mouse families. The allele for white fur (b) is recessive. Study the diagram and then answer the questions.
1.5.1
State the genotype of each mouse labelled A to G.
4
[7]
LIFE SCIENCES PAPER 1 • MOCK EXAM
1.5.2
If mouse A and G were crossed, what percentage of the offspring would have black
fur and what percentage of the offspring would have white fur?
[2] [9]
1.6
1.6.1
Which diagram shows that A is more closely related to B that it is to C?
[1]
1.6.2
Which diagram shows that A evolved before C?
[1]
1.6.3
In Diagram 2, is B more closely related to A or D?
[1]
1.6.4
What do we call D in each of the diagrams?
[1]
1.6.5
What do we call this kind of diagram?
[1]
[5]
1.7 Fill in a tick on this table to show where the structural component listed in the first column is present, in DNA, mRNA and/ or tRNA.
12 x 0.5 TOTAL SECTION A = 50
5
[6]
LIFE SCIENCES PAPER 1 • MOCK EXAM
SECTION B QUESTION 2 2.1
Consider the long legs of wading birds such as herons and egrets, birds that are
common around rivers and marshes. How could such a bird evolve long legs? Compare the way in which Lamarck’s theory and Darwin’s theory would have explained the evolution of long legs on wading birds. You can assume that the species ancestral to these birds had short legs, and could only wade into very shallow water along the shoreline, eating snails and small fish. [10]
2.2
2.2.1
According to the diagram, which organism can be regarded as a common
ancestor? 2.2.2
[1]
According to the diagram, which organism is the most closely related to modern
humans?
[1]
2.2.3
[3]
Did Homo sapiens evolve from Australopithecus? Explain your answer.
6