Section A1. The diagram below shows a structure of an animal
cell as seen under an electron microscope.
a) Name the organelles labelled A, D and
EA:...................................................................................................................
D:...................................................................................................................
E:...................................................................................................................
[3 marks]b) (i) Name the model which describe structure
C.......................................................................................................................
[1 mark](ii)State the main component that makes up structure
C........................................................................................................................[1
marks]c) Cholesterol is found in structure C. State two roles of
cholesterol in the
structure........................................................................................................................
.......................................................................................................................
.......................................................................................................................[2
marks]d) (i) Name organelle
B.......................................................................................................................[1
marks](ii) Give two functions of organelle
B........................................................................................................................
.......................................................................................................................
.......................................................................................................................
[2 marks]
2. a) Part of the DNA base sequence coding for a protein is
shown belowA T G G C C T A A G T Gi) State the corresponding base
sequence of mRNA.
.................................................................................................................
[1 mark]ii) Name the process by which the DNA code is transferred
to mRNA.
.................................................................................................................[1
mark]b) Figure 2.1 is a diagram that show the stage in protein
synthesis when amino acids are joined in the correct sequence to
make primary structure of protein.
Figure 2.1i) Name J, K, L and MThe group of bases at
J..............................................................................
K..................................................................................................................
L...................................................................................................................
The group of bases at
M................................................................................
[4 marks]ii) Using the information in figure 2.1to help you,
explain how amino acids become arranged into the correct sequence
in primary structure of protein.
.......................................................................................................................
.......................................................................................................................
.......................................................................................................................
.......................................................................................................................
.......................................................................................................................
.......................................................................................................................
[4 marks]
3. a) The diagram below show protein synthesis in eukaryote
cell.
a)(i) Name step 1 and step
2Step:.............................................................................................[1mark]Step:.............................................................................................[1mark]
(ii) Name the structure labelled A and C
A:............................................................................................................[1
mark]
C:...........................................................................................................[1
mark]
(iii) Explain what happen in step
1......................................................................................................................................................................................................................................................................................................................................................................................................................
[ 2 marks]b) The diagram below show two method in which enzymes can
be produced for industrial processes.
(i) Give two advantages using immobilized
enzymes..................................................................................................................
.................................................................................................................
.................................................................................................................
[2 marks]
(ii) Name two ways in which an enzyme or a cell can be
immobilized..................................................................................................................
.................................................................................................................[2
marks]
4. The diagram below represent a longitudinal section through
part of a striated muscle.
a)(i) What is the term used to describe the basic unit of muscle
contraction shown below?
............................................................................................................................[1
mark](ii)Identify the parts labelled A, B and C
A:........................................................................................................................
B:.........................................................................................................................
C:........................................................................................................................[3
marks]
b) The diagram shows the A band, I band and H zone. Which of the
structure : (i) Contain actin but no myosin
...........................................................................................................................
(ii)Shorten when the muscle contracts
...........................................................................................................................[2
marks]c) Describe the role played by ATP and Ca2+ in muscle
contraction(i) ATP :
.....................................................................................................................
.....................................................................................................................
.....................................................................................................................[2
marks](ii)Ca2+ :
................................................................................................................................................................................................................................................
...........................................................................................................................
[2 marks]
Section B1. a) What is meant by species? Explain the problems
faced in the definition of species.[5 marks]b) Explain how the
isolation mechanism helps in the formation of new species. [10
marks]
2. a) Describe how climatic and biotic factors affect the size
of a population[8 marks]
b) Describe how the population size of rats in a rice field can
be estimated.[7 marks]
3. a) Explain how energy is transferred through food chains and
food webs in an ecosystem.[9 marks]
b) Describe the role of natural selection in evolution. [6
marks]
4. a) Protein can be divided into two group, namely fibrous
protein and globular proteins, based on the shape of the molecule.
Describe the differences between two types of protein.[7 marks]5.
b) (i)Distinguish between diffusion and osmosis[2 marks] (ii)
Distinguish between phagocytosis and pinocytosis[3 marks]
(iii)State three features of a substance, which influence its
ability toPass through a cell membrane.[3marks]
Disediakan oleh, Disemak oleh,...............................
.............................................(PN KHOR PEI WEN) (PN
CHAN CHOOI SEONG)PENYELARAS BIOLOGI TINGKATAN KETUA PANITIA
BIOLOGIENAM RENDAH
Disahkan oleh,...................................(PN CHEE POH
KIEM)PENOLONG KANAN KURIKULUM DAN TAKBIRAN
Scheme Biology Lower six Final Year Exam 2011Section A1. a) A:
Golgi apparatus -1 B: rough endoplasmic reticulum-1 E:
mitochondrion-1
b)(i) Fluid mosaic model/ Singers model-1 (ii)
Phospholipid-1
c) Regulate the fluidity of the plasma membrane-1 - Regulate the
movement of the phospholipid in different temperature/ Help to
stabilise the membrane structure -1 -Regulate the movement of
hydrophobic molecules or /polar molecule -1 cross the plasma
membrane
d)(i) Centriole -1(ii) Organise the formation of spindle fibres
during cell division -1 - To produce basal bodies in which the
flagella and cilli develop -1
2. a)(i) UACCGGAUUCAC -1 (ii) transcription -1
b) (i)J: anticodon; R: anticodon -1 K: tRNA -1 L: ribosome/ rRNA
-1 M: codon/ R: codon -1
(ii)-DNA triplet/codon/M/mRNA triplet, code for specific amino
acid -1 tRNA / K has corresponding/ complementary, triplet/
anticodon -1 tRNA/ K attached to specific amino acid -1 codon and
anticodon bind -1 adjacent amino acid join by peptide -1[max 4M]3.
a)(i) Step 1: Transciption-1 Step 2: Translation-1 (ii)A : DNA-1 C:
polypeptide-1
(b) The double helix DNA unzip and one of the stand act as
template. -1 - The template is used to form (a single stranded)
mRNA -1 - The free nucleotide are attached together based on the
complementary -1 base pairing principles (between DNA and RNA) [max
2 M] (c)(i) Enzyme can be reuse-1 - The product is not contaminated
with enzyme.-1 - The enzyme can be used at wider temperature and PH
-1[max 2 M] (ii)- Trap in an carrier matrix such as resin-1 Place
in gel like silica -1 Bind by covalent bond in matrix like
cellulose-1[max 2 M]4. (a)(i) Sarcomere-1 (ii)A: Z line-1 B:
Actin-1 C: myosin-1
(b) (i) I band-1 (ii) I band and H zone-1
(c)(i) Provide energy to break cross-bridges/rotate myosin head
-1 - Provide energy to pump actively calcium ions back into the
-1Sarcoplasmic reticulum (ii)- Calcium ions bind to troponin
causing reorientation of the tropomyosin -1 Exposing myosin head
binding site on the actin filament -1
Section B
NoAnswerM
1.
1.
b)- Example of postzygotic mechanism are hybrid inviability/
hybrid sterility/hybrid breakdown
1
1
1
1
1
1
1
1Max5
1
1
1
1
1
1
1
1
1
1
Max 10
2.
2.
1
1
1
1
1
1
Max 4
1
1
1
1
Max 4
1
1
1
1
1
1
1
1
1
Max 7
3.a)
b)
Max 9
Max6
4.
a)
b)(i)
b)(ii)
b)(iii)
1
1
1
1
1
1
1
1Max 7
1
1
Max 2
1
1
1
Max 3
1
1
1
Max 3
