Question

When microtubules grow out of a centrosome, which end is oriented away from the centrosome?

1) Plus end
2) Minus end
3) Both ends
4) Cannot be determined

Answer 1

The plus end of microtubules is oriented away from the centrosome.

Step-by-step explanation:

When microtubules grow out of a centrosome, the end that is oriented away from the centrosome is the plus end.

Microtubules grow by adding more tubulin subunits, similar to adding more links to a chain. The plus end of microtubules is where new tubulin subunits are added, allowing the microtubule to grow.