Question

What are the steps for replication?

a) Separation, unwinding, adding new nucleotides, sealing of new strands, winding up into new double helices
b) Separation, winding, deleting of nucleotides, unsealing of old strands, unwinding
c) Adding old nucleotides in the middle of new single helices
d) Adding new nucleotides to the end of the existing double helix

Answer 1

The steps for DNA replication involve separation, unwinding, adding new nucleotides, sealing of new strands, and winding up into new double helices.

Step-by-step explanation:

1. Separation: DNA unwinds at the origin of replication, breaking the bonds between the base pairs.
2. Unwinding: Helicase opens up the DNA, forming replication forks that extend bidirectionally.
3. Adding new nucleotides: DNA polymerase adds complementary nucleotides to each parental strand, creating two new daughter strands.
4. Sealing of new strands: RNA primers are removed, gaps are filled, and DNA ligase seals the phosphodiester bonds between the new DNA fragments.
5. Winding up into new double helices: The two new daughter strands wind up into a new double helix structure.