Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

In sarcomeres, phosphate-group transfers from ATP activate _______.

  1. a. actin
  2. b. myosin
  3. c. troponin
  4. d. Z bands

Summary Introduction

Introduction: The skeletal muscles are the voluntary muscles which help in the movement of bones and other structures. The sarcomeres are the contractile units contained in the myofibrils that are connected end to end. The sliding-filament model explains about the muscle contraction with the help of the proteins such as actin and myosin.


Reason for the correct answer:

The thick filaments mainly contain myosin which is a type of motor protein that consists of a club like head and a long tail. The head possesses the enzymatic activity and it can function to break down the ADP and phosphate by binding to the ATP. This helps in the activation of the myosin protein.

Option b. is given as “myosin”.

Myosin is a type of motor protein which is present in the myofibrils of the muscle fibers. They play a major role in the muscle contraction by binding to the actin. They mainly use the energy released by the ATP hydrolysis in order to move the thin filaments to the sarcomere center.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “actin”.

Actin is a type of globular protein which is present mostly in the skeletal muscles of eukaryotes...

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