Question

The polarity in a DNA strand is indicated by referring to one end as the 3' end and the other 5' end. Which structure is on the 3' end?

Answer 1

The 3' end of a DNA strand is the end that has a free hydroxyl group (-OH).

Step-by-step explanation:

In a DNA strand, the 3' end refers to the end that has a free hydroxyl group (-OH) attached to the 3' carbon of the sugar molecule.

On the other hand, the 5' end refers to the end that has a free phosphate group (-PO4) attached to the 5' carbon of the sugar molecule.