The diagram shows part of a pre-mRNA molecule. A G part X (a) (i) Name the two substances that make up part X. (ii) Give the sequence of bases on the DNA strand from which this pre-mRNA has been transcribed. (b) (i) Give one way in which the structure of an MRNA molecule is different from the structure of a tRNA molecule. (ii) Explain the difference between pre-mRNA and mRNA. (c) The table shows the percentage of different bases in two pre-mRNA molecules. The molecules were transcribed from the DNA in different parts of a chromosome. Part of Percentage of base chromosome A G U Middle 38 20 24 End 31 22 26

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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The diagram shows part of a pre-mRNA molecule.
A
G
part X
(a) (i) Name the two substances that make up part X.
(ii) Give the sequence of bases on the DNA strand from which this
pre-mRNA has been transcribed.
(b) (i) Give one way in which the structure of an MRNA molecule
is different from the structure of a tRNA molecule.
(ii) Explain the difference between pre-mRNA and mRNA.
(c) The table shows the percentage of different bases in two pre-mRNA molecules.
The molecules were transcribed from the DNA in different parts of a chromosome.
Part of
Percentage of base
chromosome
A
G
U
Middle
38
20
24
End
31
22
26
Transcribed Image Text:The diagram shows part of a pre-mRNA molecule. A G part X (a) (i) Name the two substances that make up part X. (ii) Give the sequence of bases on the DNA strand from which this pre-mRNA has been transcribed. (b) (i) Give one way in which the structure of an MRNA molecule is different from the structure of a tRNA molecule. (ii) Explain the difference between pre-mRNA and mRNA. (c) The table shows the percentage of different bases in two pre-mRNA molecules. The molecules were transcribed from the DNA in different parts of a chromosome. Part of Percentage of base chromosome A G U Middle 38 20 24 End 31 22 26
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