The Svedberg unit (abbreviated as S) is a measure of sedimentation in an ultracentrifuge. It is used to quantify the size of cellular structures, such as ribosomes, and is based on a combination of the structure's size, shape, and surface qualities. For example, prokaryotic ribosomes have a size of $${}70$$S, whereas eukaryotic cytoplasmic ribosomes are $${}80$$S.

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Ribosomes' job is to synthesize proteins, as it binds together amino acids on tRNA to make peptides during translation.

Ribosomes

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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Prokaryotic ribosomes are structures located in the cytoplasm responsible for protein synthesis. They are constructed from proteins and ribosomal RNA (rRNA). Prokaryotic ribosomes are referred to as $${}70$$S ribosomes due to their overall size of $${}70$$S. A complete $${}70$$S prokaryotic ribosome is composed of two subunits: a small $${}30$$S subunit (which is approximately half the size of the large subunit) and a large $${}50$$S subunit. Although bacterial and archaeal ribosomes are the same size, they consist of different proteins and rRNA molecules, with archaeal versions sharing more structural similarities with eukaryotic ribosomes than with bacterial ones.

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