Question

During rigor mortis:

a. Myosin heads (with or without ADP bound) are tightly bound to the microtubules
b. Myosin heads (with ATP bound) are tightly bound to actin filaments.
c. Dynein heads (with or without ADP bound) are tightly bound to the microtubules.
d. Kinesin heads (with or without ADP bound) are tightly bound to the microtubules.
e. Myosin heads (with or without ADP bound) are tightly bound to actin filaments.

Answer 1

Rigor mortis is a state of muscle stiffness that occurs after death due to the inability of myosin heads to detach from actin filaments. This is because ATP, which is required for detachment, is no longer available. Hence the correct answer is option B

Step-by-step explanation:

Rigor mortis is a state of muscle stiffness that occurs after death, and it is caused by the inability of myosin heads to detach from actin-binding sites. In the absence of ATP, myosin heads remain tightly bound to actin filaments, resulting in muscle rigidity. This is because ATP is required for the myosin heads to undergo conformational changes and detach from actin, allowing muscle contraction to occur.

Hence the correct answer is option B