Examlex
What challenges does the current Social Security system face? How should these problems be addressed?
Cytosine
One of the four main bases found in DNA and RNA, a pyrimidine nucleotide that pairs with guanine.
Nucleus
The central and most important part of an atom, containing protons and neutrons, or a membrane-bound organelle in cells containing the genetic material.
Chromosomes
Structures made of DNA and protein found in the nucleus of cells that carry genetic information from one generation to the next.
DNA
Deoxyribonucleic acid, a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.
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