Birgid Schlindwein's

Hypermedia Glossary Of Genetic Terms

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Ribosome The term proposed by Roberts (1958)for the small cellular components (Gk. soma, body) composed of specialized ribosomal RNA and protein (ribonucleoprotein); site of protein synthesis. Plastids and mitochondria have their own ribosomes (plasto- and mitoribosomes)
Related Terms:
Ribosomal RNA (rRNA) A class of RNA found in the ribosomes of cells.
Protein A large molecule composed of one or more chains of amino acids in a specific order; the order is determined by the base sequence of nucleotides in the gene coding for the protein. Proteins are required for the structure, function, and regulation of the bodys cells, tissues, and organs, and each protein has unique functions. Examples are hormones, enzymes, and antibodies.
Plastid A cell-body (organellae) in plants other than nucleus, mitochondria and centrosome. Proplastides develop to leukoplasts (or etioplasts in the absence of light) which develop to chloroplasts and/or chromoplasts. All types of plastides can transform into each other. Their shape and function differs. Senescent plastids are called gerontoplasts. They have their own DNA (ctDNA) and ribosomes
Mitochondria Granular, rod-shaped, or filamentous self-replicating organellae in cytoplasm. Consist of an outer and inner membrane and function in cell respiration and nutrition. They have their own DNA (mtDNA) and ribosomes and are mostly maternally inherited.

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Programming: Herbert Maier
Database: Birgid Schlindwein. Please contact me if you encounter any mistakes or if you are missing anything
© Dr. Birgid B. Schlindwein
last update of the database 10/01/2006