NEET-UG Biology

How a muscle fibre is built — practice questions

10 questions in the bank on this idea. Below are 10 of them, exactly as they appear in a test.

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Question 1 · difficulty L1 · recall
The major protein of thin filaments:
- A. myosin
- B. actin
- C. keratin
- D. collagen
Question 2 · difficulty L1 · recall
The functional contractile unit between two Z lines:
- A. tendon
- B. myofibril
- C. sarcomere
- D. fascicle
Question 3 · difficulty L1 · recall
The major motor protein of thick filaments:
- A. troponin
- B. tropomyosin
- C. myosin
- D. actin
Question 4 · difficulty L1 · recall
What is the functional contractile unit between two successive Z lines in a myofibril?
- A. Sarcolemma
- B. Fascicle
- C. Sarcomere
- D. Tendon
Question 5 · difficulty L2 · understanding
Which protein forms the thick filaments of skeletal muscle?
- A. Tropomyosin
- B. Actin
- C. Troponin
- D. Myosin
Question 6 · difficulty L2 · understanding
Which region of a sarcomere contains only thin filaments?
- A. I band
- B. A band
- C. H zone
- D. M line
Question 7 · difficulty L3 · application
A microscopic region contains thick filaments throughout and overlaps with thin filaments over part of its length. Which band is being described?
- A. I band
- B. A band
- C. Z line
- D. Only the H zone
Question 8 · difficulty L3 · application
Which structure anchors the thin filaments at the boundary of a sarcomere?
- A. H zone
- B. M line
- C. Z line
- D. Sarcolemma
Question 9 · difficulty L4 · analysis
A fibre contains many parallel myofibrils. Each myofibril shows alternating dark and light bands. What produces this striated appearance?
- A. Bands of connective tissue between every actin molecule
- B. Alternating nuclei and mitochondria
- C. Periodic gaps in the sarcolemma
- D. The ordered arrangement of thick and thin myofilaments into A and I bands
Question 10 · difficulty L5 · analysis
Structure P is the membrane surrounding a muscle fibre, Q is its cytoplasm, and R is a cylindrical contractile element running through it. Which sequence is correct?
- A. Sarcolemma, sarcoplasm, myofibril
- B. Sarcoplasm, sarcolemma, fascicle
- C. Myofibril, sarcoplasm, sarcolemma
- D. Sarcolemma, tendon, sarcoplasm

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