1. Ribosome (80S) can be dissociated into two sub units (60S and 40S). The two sub units again can reform
the 80S unit. What is divalent cation in the presence of which such conversions take place?
2. In which part of the excretory system of mammals you can first use the term urine for fluid it contains?
3.Glucose is taken back from glomerular filtrate through what?
the 80S unit. What is divalent cation in the presence of which such conversions take place?
2. In which part of the excretory system of mammals you can first use the term urine for fluid it contains?
3.Glucose is taken back from glomerular filtrate through what?
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If those units were mass, for instance, you could (and should) add them: a 60g Lego piece combined with a 40g Lego piece will, of course, form a combo that has 100g.
However, those numbers are Svedberg units, which is...
a non-metric unit for sedimentation rate [...] The Svedberg coefficient is a nonlinear function. A particle's mass, density, and shape will determine its S value. (emphasis mine)
Funnily enough, most of my students thought that that S stands for Sedimentation. However, it's a tribute to Theodor Svedberg, winner of the Nobel Prize for Chemistry in 1926.
Thus, in a oversimplified explanation, the prokaryotic ribosome has two sub-units. The large sub-unit sediments at 50s, the small sub-unit sediments at 30s, but the two together (that is, the whole ribosome) sediments at 70s, not 80s.
The same way an eukaryotic ribosome has a large sub-unit that sediments at 60s, a small one that sediments at 40s, but the whole structure sediments at 80s, not 100s.
Also, the rRNAs that constitute the sub-units have their own sedimentation rates (in svedberg units) as well:

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