Biochemistry Questions and Answers – Protein Interactions Modulated by Chemical Energy: Actin, Myosin and Molecular Motors

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Protein Interactions Modulated by Chemical Energy: Actin, Myosin and Molecular Motors”.

1. Light band has which of the following filament protein?
a) Actin
b) Myosin
c) Actin and myosin
d) Tubulin
View Answer

Answer: a
Explanation: Light band has actin because it is a part of the thin filament.

2. Contractile protein of a muscle is __________
a) Troponin
b) Myosin
c) Tubulin
d) Tropomyosin
View Answer

Answer: b
Explanation: Both actin and myosin are the two contractile proteins.

3. Which of the following contractile protein of skeletal muscle involve in ATPase activity?
a) Troponin
b) Myosin
c) Tubulin
d) Tropomyosin
View Answer

Answer: b
Explanation: ATPase activity involves the conversion of ATP to ADP which releases energy. Myosin involves in such type of activity.

advertisement
advertisement

4. The cross bridges involved in muscle contraction are located on the __________
a) Myosin myofilaments
b) Actin myofilaments
c) Tropomyosin
d) Dystrophin
View Answer

Answer: a
Explanation: The globular head of a myosin that projects from myosin filament is a cross bridge.

5. The contractile unit consisting of bundles of thick filaments interleaved at either end with those of thin filaments is?
a) Myofibril
b) Cross bridges
c) Z band
d) Sarcomere
View Answer

Answer: d
Explanation: Sarcomere is the contractile unit consisting of bundles of thick filaments interleaved at either end with those of thin filaments.

6. Sarcomere is a part between __________
a) 2 I bands
b) 2 Z bands
c) 2 A bands
d) 2 H bands
View Answer

Answer: b
Explanation: Z lines are formed between adjacent sarcomeres.

7. Which of the following is the smallest division?
a) Actin
b) Fiber
c) Fibril
d) Filament
View Answer

Answer: a
Explanation: Actin, which is the part of the thin filament, is the smallest division in that group.
advertisement

8. Which of the following is false?
a) Actin is a thin filament
b) Myosin is a thick filament
c) The band in a myofibril is an area of thin filament
d) Functional unit of muscle is sarcomere
View Answer

Answer: c
Explanation: The band in a myofibril is an area of thick filament.

9. The connective tissue that surrounds individual fibers is __________
a) Fascia
b) Epimysium
c) Endomysium
d) Perimysium
View Answer

Answer: c
Explanation: Endomysium is present in between one muscle cell and other.
advertisement

10. Which of the following is an invagination of the muscle cell’s sarcolemma?
a) Cisternae
b) Microtubules
c) T tubules
d) Sarcoplasmic reticula
View Answer

Answer: c
Explanation: Transverse tubules are the invaginations of the muscle cell’s sarcolemma.

Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.