Myosin is a muscle protein, which contributes 55% of muscle proteins by weight. It is composed of six polypeptide chains, two identical heavy chains and four identical light chains. One end of each heavy chain forms a globular mass that interacts with light chains called head. The head of each myosin consists of an ATPase enzyme, which releases energy in the head by breaking down ATP into ADP and Pi.
02
PYQ 2016
medium
biologyID: kcet-201
Sarcomere is the functional unit of contraction in a muscle fibre. Identify the portion of myofibril that constitute a sarcomere.
1
The portion of myofibril between two successiveοΏ½MοΏ½line.
2
The portion of myofibril between two successive οΏ½IοΏ½ band.
3
The portion of myofibril between two successive οΏ½AοΏ½ band.
4
The portion of myofibril between two successive οΏ½ZοΏ½ line.
Official Solution
Correct Option: (4)
The sarcomere comprises A-band and half of each adjacent I-band. Sarcomere is the functional unit of myofibril.
03
PYQ 2026
easy
biologyID: kcet-202
Observe the flowchart with reference to joints and their examples.
