The 3’ end of a DNA strand is the end with the _____.Group of answer choices-PO₄⁻²-OHNext

The question asks about the 3’ end of a DNA strand. In the context of DNA structure, the 3’ end is characterized by a hydroxyl group (-OH) attached to the 3' carbon of the sugar molecule (deoxyribose in DNA). This is in contrast to the 5’ end, which has a phosphate group (PO₄) attached to the 5' carbon.

Explanation

1. Structure of DNA: DNA consists of two strands that form the double helix, with each strand made up of nucleotides. Each nucleotide contains a sugar, a phosphate group, and a nitrogenous base.
2. 5’ and 3’ Ends: The terms 5’ and 3’ refer to the directionality of the DNA strand, which is crucial for replication and transcription processes.

Conclusion

The 3’ end of a DNA strand is the end with the -OH group. Therefore, the correct answer from the choices provided is -OH.