3.1 The diagram below represents protein synthesis that takes place in a human cell. In the diagram, the first 7 triplets of nitrogenous bases that form part of the gene coding for one chain of the haemoglobin (protein) is represented. DNA template 1 2 3 4 5 6 7 TTT CÁC GTG GAC TGA GGA CTC CTC 11 GAG GAG MRNA 8. 묘 CAC 9 10 GTG CAC CTG ACT CCT GAG GAG 3.1.1 How many of the following are coded for in the DNA template sequence represented in the above diagram: (a) RNA nucleotides (b) Genes (c) Amino acids 3.1.2 Write down the nitrogen base sequence of mRNA triplets labelled 8–11. 3.1.3 Using the table below, determine the amino acid sequence coded by triplet number 1 to triplet number 4. Anticodons on TRNA CUC GUG Amino acid Glutamate Histidine Proline Leucine Threonine Valine GGA GAC UGA CAC

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Life Sciences
February 2021
NSC - Grade 12 Informal test 2 (DNA)
QUESTION 3
3.1
The diagram below represents protein synthesis that takes place in a human
cell. In the diagram, the first 7 triplets of nitrogenous bases that form part of
the gene coding for one chain of the haemoglobin (protein) is represented.
DNA template
1
2
3
4
5
6
CÁC GTG GAC TGA GGA CTC CTC
|8
CAC 9 10 11 GAG GAG
MRNA
GTG
CAC CTG ACT CCT GAG GAG
How many of the following are coded for in the DNA template
sequence represented in the above diagram:
3.1.1
(a) RNA nucleotides
(1)
(b) Genes
(1)
(c) Amino acids
(1)
Write down the nitrogen base sequence of mRNA triplets
labelled 8–11.
3.1.2
(4)
Using the table below, determine the amino acid sequence coded by
triplet number 1 to triplet number 4.
3.1.3
Anticodons on tRNA
Amino acid
CUỤC
Glutamate
GUG
GGA
GAC
Histidine
Proline
Leucine
UGA
Threonine
CAC
Valine
(4)
(11)
TOTAL SECTION6 B6
GRAND TOTAL:
40
50
Copyright reserved
Transcribed Image Text:Life Sciences February 2021 NSC - Grade 12 Informal test 2 (DNA) QUESTION 3 3.1 The diagram below represents protein synthesis that takes place in a human cell. In the diagram, the first 7 triplets of nitrogenous bases that form part of the gene coding for one chain of the haemoglobin (protein) is represented. DNA template 1 2 3 4 5 6 CÁC GTG GAC TGA GGA CTC CTC |8 CAC 9 10 11 GAG GAG MRNA GTG CAC CTG ACT CCT GAG GAG How many of the following are coded for in the DNA template sequence represented in the above diagram: 3.1.1 (a) RNA nucleotides (1) (b) Genes (1) (c) Amino acids (1) Write down the nitrogen base sequence of mRNA triplets labelled 8–11. 3.1.2 (4) Using the table below, determine the amino acid sequence coded by triplet number 1 to triplet number 4. 3.1.3 Anticodons on tRNA Amino acid CUỤC Glutamate GUG GGA GAC Histidine Proline Leucine UGA Threonine CAC Valine (4) (11) TOTAL SECTION6 B6 GRAND TOTAL: 40 50 Copyright reserved
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