Think of it this way:
DNA inside cells store all the genetic information on a person's looks, eye colour, hair colour etc. It makes them unique. The analogy of being like books in a library basically suggests that in a library there is so much information and every book is different with different knowledge... That's basically what DNA is; millions of different information things.
<span>DNA replication is the production of identical DNA helices from a single double-stranded DNA molecule. Each molecule consists of a strand from the original molecule and a newly formed strand. Prior to replication, the DNA uncoils and strands separate. A replication fork is formed which serves as a template for replication. Primers bind to the DNA and DNA polymerases add new nucleotide sequences in the 5′ to 3′ direction. This addition is continuous in the leading strand and fragmented in the lagging strand. Once elongation of the DNA strands is complete, the strands are checked for errors, repairs are made and telomere sequences are added to the ends of the DNA.</span>
Onion (Allium) and Banana (Musa) are both eukaryotes and both have cell walls.
Explanation:
One of the main differences between prokaryotes and wukaryotes is that the last ones have a nucleus and organelles with their own membranes. <em>This carachteristic allow them to organize into multicellular organisms isolating different processes (enzymes, reactants) making them easier to manage and more efficient due to the smaller volume that increase the rate of reactions.</em>
I hope you find this information useful and interesting! Good luck!