Question

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

Explanation:

During DNA replication, the first step is that the DNA double - helix structure unwinds. This unwinding is necessary to expose the individual strands so that new complementary strands can be synthesized. The other options are not the first step in DNA replication. Folding over to create a dense chromosome is more related to chromosome condensation (not the start of replication). RNA attaching to DNA occurs in processes like transcription (not the first step of replication). And all of the cell's DNA attaching to proteins is a general chromatin - related process, not the first step of replication.

Answer:

The DNA unravels to make two strands.