Structure of Proteins & Metabolism — NEET Biology MCQs with Solutions
Free NEET Biology Structure of Proteins & Metabolism MCQs with step-by-step solutions (6 questions). Part of Biomolecules. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Structure of Proteins & Metabolism · easy · theory
The linear sequence of amino acids in a polypeptide is its ______ structure:
A. Tertiary
B. Quaternary
C. Primary ✓ Correct
D. Secondary
Solution: Primary structure = amino acid sequence; the first amino acid (N-terminal) and last (C-terminal) mark the ends.
Q2 — Structure of Proteins & Metabolism · easy · theory
The sum total of all the chemical reactions occurring in a cell/body is called:
A. Catalysis
B. Osmosis
C. Metabolism ✓ Correct
D. Diffusion
Solution: Metabolism includes anabolic (build-up) and catabolic (break-down) reactions; no metabolite exists in isolation.
Q3 — Structure of Proteins & Metabolism · medium · theory
The three-dimensional folding of a polypeptide into a hollow woolen-ball-like form is its ______ structure:
A. Primary
B. Tertiary ✓ Correct
C. Quaternary
D. Secondary
Solution: Tertiary structure is the overall 3-D shape essential for biological function; quaternary is the arrangement of multiple subunits.
Q4 — Structure of Proteins & Metabolism · medium · theory
Haemoglobin, made of four subunits, illustrates the ______ structure of proteins:
A. Secondary
B. Primary
C. Quaternary ✓ Correct
D. Tertiary
Solution: Quaternary structure describes the spatial arrangement of two or more polypeptide chains (e.g. 4 subunits of Hb).
Q5 — Structure of Proteins & Metabolism · hard · theory
The "living state" (metabolism) is a NON-equilibrium steady state because:
A. Metabolism ceases at steady state
B. A cell is at chemical equilibrium
C. Reactions stop in living cells
D. A living cell is a system at steady state, kept away from equilibrium by constant energy input ✓ Correct
Solution: Reaching equilibrium means death; living systems maintain a steady state far from equilibrium via continuous energy flow.
Q6 — Structure of Proteins & Metabolism · hard · theory
Which best describes the "dynamic state of body constituents"?
A. Only carbohydrates turn over
B. Metabolism has no direction
C. Biomolecules are continuously being made and broken down (turnover) ✓ Correct
D. Biomolecules never change once formed
Solution: Body constituents undergo constant turnover (synthesis and degradation) — the dynamic (not static) state of metabolism.