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Which sketches best represent the primary, secondary and tertiary structure of proteins? primary structure secondary structure tertiary structure A - VCE - SSCE Chemistry - Question 13 - 2009 - Paper 1
Question 13
Which sketches best represent the primary, secondary and tertiary structure of proteins? primary structure secondary structure tertiary structure A. I II IV B. ... show full transcript
Worked Solution & Example Answer:Which sketches best represent the primary, secondary and tertiary structure of proteins? primary structure secondary structure tertiary structure A - VCE - SSCE Chemistry - Question 13 - 2009 - Paper 1
Step 1
Which sketches best represent the primary, secondary and tertiary structure of proteins?
Answer
To determine which sketches represent the primary, secondary, and tertiary structures of proteins, we must recall the characteristics of each structure:
- Primary Structure: This is the linear sequence of amino acids in a protein.
- Secondary Structure: This involves the folding of the primary structure into patterns such as alpha-helices and beta-sheets.
- Tertiary Structure: This is the overall three-dimensional shape of a protein, resulting from further folding and interactions between various amino acids.
Based on these definitions, we can analyze the provided images (I, II, III, IV) to identify which combination accurately reflects these structures. The correct answer from the options is D. III II IV as it accurately depicts the hierarchical organization of protein structure.
Step 2
The tertiary structure of proteins may be maintained by
Answer
The tertiary structure of proteins is stabilized by various types of interactions. Therefore, to answer this question:
- A. Hydrogen bonding: These weak interactions contribute significantly to maintaining the shape of the protein.
- B. Ionic interactions: Also known as electrostatic interactions, these occur between charged side chains of amino acids.
- C. Covalent bonds: Disulfide bridges, which are formed between cysteine residues, are a type of strong covalent interaction that help stabilize the protein structure.
- D. All of the above: Since all these interactions—hydrogen bonds, ionic interactions, and covalent bonds—play important roles in maintaining the tertiary structure of proteins, the correct answer is D.