It looks like you are describing the central dogma of molecular biology, but there are some placeholders in your text that need to be filled in with the appropriate terms. Here's the corrected version:
The flow of genetic information in cells follows a process called the central dogma of molecular biology. This process explains how a gene in DNA is used to produce proteins, which determine traits. DNA, or deoxyribonucleic acid, is made up of repeating units called nucleotides. Each nucleotide consists of a phosphate group, a sugar called deoxyribose, and a nitrogenous base. The first step in the central dogma is transcription, where a section of DNA is copied into messenger RNA (mRNA). Unlike DNA, RNA contains a different sugar called ribose. The RNA then moves to the ribosome, where the next stage, known as translation, takes place. In this process, the ribosome reads the RNA and assembles a chain of amino acids to form a protein. This entire pathway, from DNA to RNA to protein, explains how genetic information results in an organism’s observable characteristics.
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