wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

In the resting muscle fiber, tropomyosin partially covers


A

Calcium-binding sites on troponin

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

Actin binding sites on myosin

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Myosin binding sites on actin

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

Calcium-binding sites on actin

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C

Myosin binding sites on actin


The correct option is C.

Explanation of the correct option:

  1. Tropomyosin is a protein found in the actin filaments in muscles.
  2. When the muscle is at rest, the tropomyosin molecule covers the binding site of the actin molecule where interaction with myosin occurs.

Explanation of the incorrect options:

Option A:

Calcium-binding sites interact with myosin and help in contraction.

Option B:

On contraction of the muscle, the tropomyosin is displaced troponin, allowing the interaction of actin with myosin.

Option D:

On an increase in calcium level in the cell, calcium binds to actin filaments.

Final answer: In the resting muscle fiber, tropomyosin partially covers Myosin-binding sites on actin.


flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Skeletal Muscle
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon