Unit 2: Form and Function
Topic 2.2: Proteins Questions
Practice 20 exam-style questions for IB Biology Topic 2.2. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
A molecule is found to contain the elements carbon, hydrogen, oxygen and nitrogen.
Which type of molecule could it be?
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A non-essential amino acid is best described as one that:
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Which part of an amino acid is the variable R group (side chain) — the part that makes one amino acid differ from another?
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How many different amino acids are used to build proteins in living organisms?
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Which pairing of a protein with its main role is correct?
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State the name of the transport protein that carries oxygen in human red blood cells.
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State what determines the conformation (folded 3D shape) of a protein.
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How do two amino acids link together to form a dipeptide?
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Which level of protein structure is simply the sequence (order) of amino acids in the chain?
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What is the defining feature of an amino acid that is described as 'essential' for humans?
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What name is given to the precise folded three-dimensional shape of a protein?
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State which part of an amino acid is different between one amino acid and another.
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Distinguish between how the body obtains an essential amino acid and how it obtains a non-essential amino acid.
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A protein is needed to bind to specific invading microbes so the body can destroy them.
Which type of protein performs this role?
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State the only source from which the body can obtain an essential amino acid.
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State the name of the reaction by which two amino acids join to form a dipeptide.
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Roughly how many of the 20 amino acids used to build human proteins are essential (must be obtained from the diet)?
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What is the name of the reaction that breaks a peptide bond by adding a molecule of water?
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A protein solution is heated to a high temperature and the protein loses its shape and stops working.
What is preserved?
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α-helices and β-pleated sheets, held together by hydrogen bonds, are features of which level of protein structure?
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