Cell, nucleus, chromosome, DNA, nucleotide.
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The smallest structure is a nucleotide, which is the building block of DNA. Multiple nucleotides come together to form DNA, which is contained in the chromosome. The nucleus is the largest structure, containing all the chromosomes in a cell.
Genes aren't in DNA. It holds the key to make genes.
key to genes, DNA, chromosomes, nucleus, cell
Nucleotide < DNA < Chromosome < Cell < Nucleus.
An atom comprises an atomic nucleus with orbiting electrons. So the nucleus is smaller than an atom. To phrase it the opposite way, an atom is alwys larger than the nucleus (of the same atom of course!!)
nucleus → chromosome → gene
The Nucleus
The nucleotide bases store the information.