Name the part of a prokaryotic cell from each description…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the part of a prokaryotic cell from each description.
- An infolding of the plasma membrane that helps copy the DNA and build the wall.
- A small ring of DNA that can make a bacterium resistant to an antibiotic.
- Bristle-like fibres that help a bacterium cling to a rock in a stream.
- Membranes holding pigments, in a blue-green alga.
- Granules of stored glycogen, with no membrane around them.
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. (a) A mesosome.
Step 2. (b) A plasmid.
Step 3. (c) Fimbriae.
Step 4. (d) Chromatophores.
Step 5. (e) Inclusion bodies.
Answer: (a) mesosome; (b) plasmid; (c) fimbriae; (d) chromatophores; (e) inclusion bodies.
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