Question at position 25 A missense mutation might be affected what level of protein structure?All levels might be affected by a single amino acid substitutionPrimary structure onlyQuaternary structure onlySecondary structure onlyTertiary structure onlyClear my selection

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Question: A missense mutation might be affected what level of protein structure?

Option 1: All levels might be affected by a single amino acid substitution
- Reasoning: A missense mutation changes one amino acid in the primary sequence. That alteration can propagate through the entire protein, influencing local folding (secondary structure), the 3D conformation (tertiary structure), and even how subunits assemble (quaternary structure) as altered interactions alter stability and contacts. Since the primary sequence underpins all higher levels, a single substitution has the potential to impact multiple levels, not just one.

Option 2: Primary structure only
- Reasoning: This is too restrictive. While the primary sequence is definitively changed by a missense mutation, the consequences often extend beyond the sequence to affect folding and interactions, thereby influencing secondary, tertiary, and quaternary structures. The statement ignores cascading effects of amino acid changes on structure.

Option 3: Quaternary structure only
- Reasoning: This would imply the mutation affects only the assembly of subunits. In reality, a substitution can alter intramolecular folding (secondary/tertiary) and the interface between subunits, potentially affecting quaternary structure as well. Limiting impact to just quaternary structure misses possible effects on earlier levels.

Option 4: Secondary structure only
- Reasoning: Secondary structure (alpha helices, beta sheets) can be perturbed by changes in local interactions, but it is not guaranteed to be the sole affected level. A missense mutation can disrupt tertiary packing or even cause misfolding that propagates to the overall fold or stability, hence not confined to secondary structure.

Option 5: Tertiary structure only
- Reasoning: While many missense mutations disrupt the overall 3D fold, specifying only the tertiary level excludes potential effects on local secondary structure and on quaternary assembly. The impact is not universally restricted to the tertiary level, especially if subunit interfaces are involved.

Overall, the most accurate view is that a single amino acid substitution has the potential to affect multiple levels of protein structure, not just a single level. This breadth reflects the interconnected nature of sequence, folding, and assembly in proteins.

Question at position 25 A missense mutation might be affected what level of protein structure?All levels might be affected by a single amino acid substitutionPrimary structure onlyQuaternary structure onlySecondary structure onlyTertiary structure onlyClear my selection

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Question at position 25 A missense mutation might be affected what level of protein structure?All levels might be affected by a single amino acid substitutionPrimary structure onlyQuaternary structure onlySecondary structure onlyTertiary structure onlyClear my selection

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类似问题

Question at position 22 What level(s) of protein structure could be affected by a nucleotide substitution that results in an amino acid change in a polypeptide?quaternary structureprimary structuretertiary structureThere will be no structural changes.secondary structure

The interiors of globular proteins tend to be enriched for ______________ aminoacids while the protein surface regions near the aqueous environment tend to be _________________________

Question at position 22 Assume that a mutation results in an amino acid substitution in the translated polypeptide. What level of protein structure is definitely affected as a result? quaternaryprimary and tertiarytertiaryprimary and secondaryall levels of protein structureprimary

Question at position 1 What level(s) of protein structure could be affected by a nucleotide substitution that results in an amino acid change in a polypeptide?quaternary structureprimary structureThere will be no structural changes.tertiary structuresecondary structure

A protein composed of more than one polypeptide is known as a:

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The interiors of globular proteins tend to be enriched for aminoacids while the protein surface regions near the aqueous environment tend to be ___________