Eukaryotic CellsEukaryotic cells are generally larger and more complex than prokaryotic cells. They also contain a variety of cellular bodies called organelles. The organelles function in the activities of the cell and are compartments for localizing metabolic function. Microscopic protozoa, unicellular algae, and fungi have eukaryotic cells. Nucleus. Eukaryotic cells have a distinctive nucleus, composed primarily of protein and deoxyribonucleic acid, or DNA. The DNA is organized into linear units called chromosomes, also known as chromatin when the linear units are not obvious. Functional segments of the chromosomes are referred to as genes.The nuclear proteins belong to a class of proteins called histones. Histones provide a supportive framework for the DNA in chromosomes. The DNA replicates in eukaryotic cells during the process of mitosis.
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