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 cannot be confirmed based on the provided monomer sequences. Although some similarity may exist, there is not enough information to assert that all chains originate from the same DNA sequence.
Step 2
B. each total chain contains the same number of monomers.
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Answer
The provided sequences suggest that the chains may vary in length. Therefore, this statement is likely false, as each chain contains a different arrangement and possibly different numbers of monomers.
Step 3
C. adjacent monomers are linked by a peptide bond.
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Answer
This statement is accurate because in polypeptide chains, monomers (amino acids) are indeed linked together by peptide bonds, forming a continuous chain.
Step 4
D. each monomer is specified by a nucleotide.
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This statement is misleading. While each amino acid is encoded by a sequence of nucleotides in DNA, a single nucleotide does not correspond to a single monomer (amino acid); rather, groups of three nucleotides (codons) code for a single amino acid.
