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Cells and DNA - MedlinePlus

Help Me Understand GeneticsCells and DNAR eprinted from MedlinePlus National Library of MedicineNational Institutes of HealthDepartment of Health & Human ServicesReprinted from MedlinePlus Genetics ( )iTable of Contents1 What is a cell?12 What is DNA?63 What is a gene?94 What is a chromosome?115 How many chromosomes do people have?136 What is noncoding DNA?14 Reprinted from MedlinePlus Genetics ( )1 Cells and DNA1 What is a cell? Cells are the basic building blocks of all living things. The human body is composed of trillions of Cells . They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body s hereditary material and can make copies of have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell.

Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell. Human cells contain the following major parts, listed in alphabetical order: Cytoplasm Within cells, the cytoplasm (Figure 1) is made up of a jelly-like fluid (called the cytosol)

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