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bio question

Discussion in 'DAT Discussions' started by ippie, May 12, 2008.

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  1. ippie

    ippie ippie

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    1. DNA has proof reading ability, but RNA does not.
    What does proof reading mean?

    2. Ribosomes are assembled by the nucleolus.
    Here the word "assembled" doesn't mean "put together". right?
    Each subunit of ribosomes is made in nucleolus,
    and two subunits are put together in cytoplasm when the protein synthesizes. Am I right?

    3. Do both prokaryotes and eukaryotes have cytoskeleton?
    In Kaplan, prokaryotes, don't have cytoskeleton.
    In DAT destroyer, both have cytoskeleton.
    In Wikipedia, "it was once thought this structure was unique to eukaryotes, but recent research has identified the prokaryotic cytoskeleton."
    How can I answer in the test if I am confused with two answer choices.
     
    #1 ippie, May 12, 2008
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  2. joh020340

    joh020340

    Able to excise nucleotides 3'-5' (backtracking mistakes) and replace them with correct nucleotide.

    Small and large subunit only come together during translation, then they split up. During non-translation, they exist as subunits in cytosol.

    DAT Destroyer also said that bacteria have mesosomes which are now shown to only form during preservation. So I would be skeptical of Destroyer, trust textbooks.
     
    #2 joh020340, May 12, 2008
  3. ak47

    ak47 flossy flossy

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    Prokaryotes (I know bacteria for sure) have cytoskeletons. Two examples: FtsZ and MreB!
     
    #3 ak47, May 12, 2008
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