Following is the figure of actin (thin) filaments. Identify A, B and C. (a) A-Tropomyosin, B-Tro

Name: Problem 44, Chapter 20: Objective Biology for NEET
Uploaded: 2021-10-23T12:21:29-08:00
Duration: 2 min 24 s
Channel: Qudsiya Anis
Description: Following is the figure of actin (thin) filaments. Identify A, B and C. (a) A-Tropomyosin, B-Troponin, C-F actin (b) A-Tropomyosin, B-Myosin, C-F Tropomyosin (c) A-Troponin, B-Tropomyosin, C-Myosin (d) A-Troponin, B-Tropomyosin, C-F actin

step 1 We have been shown the diagram of the arrangement of the actin filament also record was the thin

Question

Following is the figure of actin (thin) filaments. Identify $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$. (a) A-Tropomyosin, B-Troponin, C-F actin (b) A-Tropomyosin, B-Myosin, C-F Tropomyosin (c) A-Troponin, B-Tropomyosin, C-Myosin (d) A-Troponin, B-Tropomyosin, C-F actin

   Following is the figure of actin (thin) filaments. Identify $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$. 
(a) A-Tropomyosin, B-Troponin, C-F actin
(b) A-Tropomyosin, B-Myosin, C-F Tropomyosin
(c) A-Troponin, B-Tropomyosin, C-Myosin
(d) A-Troponin, B-Tropomyosin, C-F actin

Objective Biology for NEET

Rajiv Vijay 1st Edition

Chapter 20, Problem 44

Instant Answer

Solved by Expert Qudsiya Anis

10/23/2021

Step 1

The actin filament is made up of two filaments that are helically wound to each other. This arrangement is similar to the arrangement of DNA. In the given figure, the helically wound structures represent the F actin or filamentous actin. Therefore, label C Show more…

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Following is the figure of actin (thin) filaments. Identify $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$. (a) A-Tropomyosin, B-Troponin, C-F actin (b) A-Tropomyosin, B-Myosin, C-F Tropomyosin (c) A-Troponin, B-Tropomyosin, C-Myosin (d) A-Troponin, B-Tropomyosin, C-F actin

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Key Concepts

F-actin

F-actin, or filamentous actin, is a polymerized form of actin that constitutes the backbone of the thin filaments in muscle fibers. It serves as the main structural framework that provides the binding sites for myosin and is crucial for muscle contraction and cell motility.

Tropomyosin

Tropomyosin is a regulatory protein that binds along the length of actin filaments. It plays a critical role in muscle contraction by blocking or exposing the binding sites on actin, thereby controlling the interaction between actin and myosin based on the presence of calcium ions.

Troponin

Troponin is a complex of proteins attached to the actin filament that works in conjunction with tropomyosin to regulate muscle contraction. By binding calcium ions, troponin induces conformational changes in the thin filament, allowing tropomyosin to shift and expose myosin-binding sites on actin, which initiates contraction.

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