An mRNA is 1200 nm long. Ribosomes sit on it at the start and then one every 80 nm, up to its end…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
An mRNA is long. Ribosomes sit on it at the start and then one every , up to its end.
- How many gaps are there between ribosomes?
- How many ribosomes are there?
- What is this chain of ribosomes called?
Need a reminder? The key ideaShow
Prokaryotes: bacteria, blue-green algae, mycoplasma and PPLO. Cell envelope: glycocalyx (slime layer or capsule), cell wall, plasma membrane. Naked DNA in a nucleoid, plus plasmids. Mesosomes are infoldings of the membrane. Flagellum: filament, hook, basal body; pili and fimbriae do not move the cell. 70S ribosomes (50S and 30S) and polysomes; inclusion bodies have no membrane.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Gaps. .
Step 2. Ribosomes. .
Step 3. Name. A polysome, or polyribosome.
Answer: ; ; a polysome.
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