Question

• They contain 70S ribosomes.

in this what "S" denotes​

Answer 1

Answer:

Bacteria and archaebacteria have smaller ribosomes, termed 70S ribosomes, which are composed of a small 30S subunit and large 50S subunit. The "S" stands for svedbergs, a unit used to measure how fast molecules move in a centrifuge.

Explanation:

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Answer 2

All prokaryotes have 70S (where S=Svedberg units) ribosomes while eukaryotes contain larger 80S ribosomes in their cytosol. The 70S ribosome is made up of a 50S and 30S subunits. Ribosomes play a key role in the catalysis of two important and crucial biological processes. The Svedberg unit (S) offers a measure of particle size based on its rate of travel in a tube subjected to high g-force.