Which of the following statements about the molecular arrangement of actin and myosin are correct?
$I.$ Each actin (thin filament) is made up of $2$ $F$ (filamentous) actins.
$II.$ $F$-actin is the polymer of $G$ (globular) actin.
$III.$ $2$ $F$-actins are twisted into a helix.
$IV.$ Two strands of tropomyosin (protein) lie in the grooves of $F$-actin.
The correct option is:

  • A
    $I$ and $II$
  • B
    $III$ and $IV$
  • C
    $I$ and $IV$
  • D
    All except $IV$

Explore More

Similar Questions

Muscle fatigue occurs due to the accumulation of . . . . . . .

Which muscle band remains unchanged during the contraction and relaxation of the skeletal muscle?

The diagram given below represents the structure of a striated muscle fiber. Label the parts $A, B, C, D, E$ and $F$.

Muscle is attached to bone by

During muscular contraction,which of the following processes occurs?

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo