Correct option is B
Correct Answer: 2. It transports organelles in anterograde direction.
Dynein is a microtubule-dependent motor protein that moves cellular cargoes along microtubules. To determine the incorrect statement, let’s evaluate each option based on dynein’s known functions:
Option-by-Option Analysis:
1. It helps in cilia and flagella beating. - Correct.
Axonemal dynein powers the sliding movement of microtubules within cilia and flagella, enabling their beating and movement.
2. It transports organelles in anterograde direction.- Incorrect.
Dynein is responsible for retrograde transport (towards the minus-end of microtubules, typically toward the cell center/nucleus).
Anterograde transport (toward the plus-end, or cell periphery) is carried out by kinesin, not dynein.
3. It participates in spindle assembly and positioning.- Correct.
Cytoplasmic dynein plays a crucial role in mitotic spindle positioning, anchoring of centrosomes, and chromosome movement during cell division.
4. It interacts with dynactin for efficient transport.- Correct.
Dynein requires the dynactin complex for cargo binding, processivity, and directional control during transport.
