What are permanent features of a bacterial cell?

  1. Out of these I mean

    1. Capsule
    2. Cell wall
    3. Flagella
    4. Nucleus
    5. Plasmid

    Bacteria don't have a definite nucleus, I'm thinking it is cell wall that is a permanent feature. Am I right!!
  2. jcsd
  3. Ryan_m_b

    Staff: Mentor

    Is this a homework question?
  4. Capsule, nucleus and flagella can be immediately eliminated. That leaves cell wall and plasmid. And I know that mycoplasma don't possess a cell wall. Technically all bacteria can have plasmids (and most do) but they are not essential for the survival of a cell (in the way cell membranes are for example). So I wouldn't call it a permanent feature.

    Looks like it. Probably needs to be moved.
    Last edited: Oct 24, 2011
  5. bobze

    bobze 652
    Science Advisor
    Gold Member

    No, he's studying for boards.

    Mish is correct, just the cell wall.

    Capsule expression is controlled by genes which receive environmental feedback, as are flagella (though you should note, that some bacteria are "permanently" motile through expression of a flagella, others it is inducible as a virulence factor).

    Prokaryotes are anucleate.

    And plasmids aren't a permanent structure.

    As a side note Sameer, you're prepping for USMLE step one correct? Are you taking it outside the US?

    Also, not sure if its available where you're at, but certainly online, you need to a get a copy of First-Aid for Step 1 ASAP if you don't already have it. You should use it as you are studying topics and make notes in it, etc. Great book, can't stress it enough. Most US med students comments about First-Aid was "I wish I would have started using it in first year of medical school".

    Best of luck.
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