There are 4 polypeptide chains in a human haemoglobin molecule - VCE - SSCE Biology - Question 11 - 2006 - Paper 1
Question 11
There are 4 polypeptide chains in a human haemoglobin molecule. The monomers in a small section of each of the 4 chains is shown.
chain 1
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Worked Solution & Example Answer:There are 4 polypeptide chains in a human haemoglobin molecule - VCE - SSCE Biology - Question 11 - 2006 - Paper 1
Step 1
A. each of the chains is the result of the same DNA sequence.
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Answer
This statement is likely incorrect. Although the chains may have similarities, variations in sequences suggest that they might not originate from the same DNA sequence.
Step 2
B. each total chain contains the same number of monomers.
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Answer
This statement cannot be confirmed with the given information. Different chains may have different lengths and numbers of monomers.
Step 3
C. adjacent monomers are linked by a peptide bond.
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Answer
This statement is correct. In polypeptide chains, adjacent amino acids (monomers) are linked together through peptide bonds, forming the backbone of the protein structure.
Step 4
D. each monomer is specified by a nucleotide.
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Answer
This statement is somewhat misleading. While nucleotides in DNA sequences code for amino acids (the monomers), it is a more complex process; thus, one should not equate each monomer directly with a nucleotide.
