Cells160-page10 - eukaryotes the ribosomes are 80s whereas...

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Cell - 10 Nucleus Contents Chromatin Chromatin consists of chromosomes, long molecules of DNA, surrounded by proteins known as histones. Chromatin appears granular when observed with a microscope Each type of organism has a set number of chromosomes. Some examples: Mosquito = 6 Lily = 24 Human = 46 Chimpanzee, Orangutan, Gorilla, and Potato =48 Amoeba =50 Horsetails = 216 Adder Tongue Fern =1262 Nucleolus Small concentrated masses DNA, RNA and protein. Used in synthesis of ribosome subunits Ribosomes are the site for the assembly of proteins. Ribosomes consist of two subunits, and are composed of RNA and protein. In
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Unformatted text preview: eukaryotes, the ribosomes are 80s, whereas the ribosomes of prokaryotes are 70s, one of the reasons some antibiotics are effective against bacteria, and don't harm us. • The genes needed for the manufacture of ribosomal RNA cluster in the nucleolus, where they direct ribosomal RNA synthesis. Ribosomal subunits are assembled in the nucleolus from rRNA and protein. • Completed ribosomal subunits move into the cytoplasm for functioning, where many sit on the surface of rough endoplasmic reticulum. Some ribosomes are located freely in the cytosol....
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