Myoglobin and haemoglobin are oxygen-binding proteins in mammals - Scottish Highers Biology - Question 4 - 2019
Question 4
Myoglobin and haemoglobin are oxygen-binding proteins in mammals. The myoglobin molecule is a single globin polypeptide. The haemoglobin molecule is composed of both... show full transcript
Worked Solution & Example Answer:Myoglobin and haemoglobin are oxygen-binding proteins in mammals - Scottish Highers Biology - Question 4 - 2019
Step 1
Name a bond that holds the polypeptide chain in this shape.
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Answer
The bond that holds the polypeptide chain in this shape is a hydrogen bond.
Step 2
Give a reason for this difference.
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Answer
The reason for this difference is that introns/non-coding sequences are removed from the primary transcript during RNA splicing, resulting in the mature mRNA transcript containing only exons.
Step 3
Describe how a duplication mutation occurs.
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Answer
A duplication mutation occurs when a section of a chromosome or gene is added to its homologous partner, resulting in additional copies of that gene.
Step 4
Explain the importance of duplication mutations in evolution.
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Answer
Beneficial mutations can occur in one of the copies of the gene, allowing that copy to evolve independently while the other copy can still be expressed to produce its protein. This can provide genetic diversity and new functional adaptations.
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