DNA, Genes and Chromosomes PhysicsAndMathsTutor.com
Q1.The diagram below represents one process that occurs during protein synthesis.
(a) Name the process shown.
........................................................................................................................
(1)
(b) Identify the molecule labelled Q.
........................................................................................................................
(1)
(c) In the diagram above, the first codon is AUG. Give the base sequence of:
the complementary DNA base sequence .....................................................
the missing anticodon ...................................................................................
(2)
The table below shows the base triplets that code for two amino acids.
Amino acid Encoding base triplet
Aspartic acid GAC, GAU
Proline CCA, CCG, CCC, CCU
(d) Aspartic acid and proline are both amino acids. Describe how two amino acids differ
from one another. You may use a diagram to help your description.
Page 2
, DNA, Genes and Chromosomes PhysicsAndMathsTutor.com
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........................................................................................................................
........................................................................................................................
(1)
(e) Deletion of the sixth base (G) in the sequence shown in the diagram above would
change the nature of the protein produced but substitution of the same base would
not. Use the information in the table and your own knowledge to explain why.
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........................................................................................................................
........................................................................................................................
(Extra space) ................................................................................................
........................................................................................................................
........................................................................................................................
(3)
(Total 8 marks)
Q2.(a) Messenger RNA (mRNA) is used during translation to form polypeptides.
Describe how mRNA is produced in the nucleus of a cell.
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........................................................................................................................
........................................................................................................................
........................................................................................................................
Page 3
Q1.The diagram below represents one process that occurs during protein synthesis.
(a) Name the process shown.
........................................................................................................................
(1)
(b) Identify the molecule labelled Q.
........................................................................................................................
(1)
(c) In the diagram above, the first codon is AUG. Give the base sequence of:
the complementary DNA base sequence .....................................................
the missing anticodon ...................................................................................
(2)
The table below shows the base triplets that code for two amino acids.
Amino acid Encoding base triplet
Aspartic acid GAC, GAU
Proline CCA, CCG, CCC, CCU
(d) Aspartic acid and proline are both amino acids. Describe how two amino acids differ
from one another. You may use a diagram to help your description.
Page 2
, DNA, Genes and Chromosomes PhysicsAndMathsTutor.com
........................................................................................................................
........................................................................................................................
........................................................................................................................
(1)
(e) Deletion of the sixth base (G) in the sequence shown in the diagram above would
change the nature of the protein produced but substitution of the same base would
not. Use the information in the table and your own knowledge to explain why.
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
(Extra space) ................................................................................................
........................................................................................................................
........................................................................................................................
(3)
(Total 8 marks)
Q2.(a) Messenger RNA (mRNA) is used during translation to form polypeptides.
Describe how mRNA is produced in the nucleus of a cell.
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
Page 3
