Question

Which one of the following statements is TRUE for dynein and kinesin family of motor proteins?

• A. Both dynein and kinesin are only (+) end directed motors
• B. Dynein is (-) end directed and kinesin can be either (+) or (–) end directed
• C. Both dynein and kinesin are only (–) end directed motors
• D. Kinesin is (+) end directed and dynein can be either (+) or (–) end directed

Hint:

Dynein moves toward the cell center (– end), while kinesin typically moves away from the center (+ end), but can move in both directions depending on the type.

Answer 1

The Correct Option is B

Step 1: Understanding motor proteins.
- Dynein moves along microtubules towards the minus (-) end, typically toward the cell center.
- Kinesin moves along microtubules towards the plus (+) end, typically away from the cell center, but it can also move toward the minus end in some cases.
Step 2: Conclusion.
Therefore, the correct statement is (B): Dynein is a (-) end directed motor, while kinesin can be directed to either end.