Question

Polarity of growing microtubules:

a. goes from the nucleus out
b. goes from the alpha-tubulin end to the beta-tubulin end
c. can go to either the alpha-tubulin or beta-tubulin end depending on the direction the cells in moving
d. goes from the beta-tubulin end to the alpha-tubulin end
e. goes from the plasma membrane in

Answer 1

The polarity of growing microtubules extends from the alpha-tubulin end to the beta-tubulin end, this direction is considered the positive end for addition of tubulin dimers.

Step-by-step explanation:

The polarity of growing microtubules is such that they extend from the alpha-tubulin end to the beta-tubulin end. This is referred to as the plus end (+end) where tubulin dimers add to a growing microtubule, fueled by GTP hydrolysis. Oppositely, the minus end (-end), typically found at the centrosome or microtubule organizing center (MTOC), is where disassembly can occur.

During cell division, specifically mitosis or meiosis, microtubules play an essential role by helping pull replicated chromosomes to opposite ends of the dividing cell. Furthermore, microtubules emanating from the centrosome help the cell keep its shape, provide tracks for vesicle movement, and assist cellular components in their proper orientation.