FBISE, NCP & NBF-aligned resources for Classes 9–12
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Biology Chapter 2 : Topic 3
Structure and Functions of Proteins
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Proteins are polymers made up of:
Reasoning: Proteins are long chains of amino acids linked together.
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The basic building block of a protein is:
Reasoning: Amino acids are the monomers that combine to form proteins.
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Two amino acids join together through the formation of a:
Reasoning: A peptide bond links amino acids to form protein chains.
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Which part is present in every amino acid?
Reasoning: Every amino acid contains an amino (−NH²) group and a carboxyl (−COOH) group.
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Which element distinguishes proteins from carbohydrates and lipids?
Reasoning: Proteins contain nitrogen, which is absent in carbohydrates and most lipids.
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A growing child requires proteins mainly because proteins:
Reasoning: Proteins are essential for body growth and tissue repair.
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Which of the following is the richest source of protein?
Reasoning: Eggs are highly rich in proteins and essential amino acids.
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Which food combination provides a significant amount of proteins?
Reasoning: Meat and pulses are excellent dietary sources of proteins.
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Enzymes are classified as:
Reasoning: Most enzymes are proteins that catalyze biochemical reactions.
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Which function is NOT commonly performed by proteins?
Reasoning: DNA stores hereditary information, not proteins.
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If protein synthesis stops in a cell, which activity would be most directly affected?
Reasoning: Enzymes are proteins; therefore, their production would stop.
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The amino group of an amino acid contains:
Reasoning: The amino group is represented by –NH².
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Which statement best explains why proteins are called body-building foods?
Reasoning: Proteins are needed for growth and repair of tissues.
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Which structure is common to all amino acids?
Reasoning: All amino acids have a central carbon attached to amino and carboxyl groups.
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Which of the following is an application of proteins in the human body?
Reasoning: Many hormones and enzymes are proteins.
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