Question

a zebra cell is just about to replicate its dna. what will happen first? rna attaches to dna. the dna unravels to make two strands. all of the cells dna attaches to proteins. the dna folds over itself to create a dense chromosome.

Explanation:

To determine the first step of DNA replication in a zebra cell, we analyze each option:

• RNA attaching to DNA is part of transcription, not DNA replication's first step.
• DNA replication starts with the DNA double helix unwinding (unraveling) to expose the two template strands. This is the initial event as replication enzymes need access to the nucleotide sequence.
• DNA attaching to proteins (like histones) is related to chromatin structure but not the first step of replication.
• DNA folding into a dense chromosome occurs during cell division (condensation), not at the start of replication.

Answer:

The DNA unravels to make two strands.