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Post-Translational Modification quiz

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  • What is the main purpose of post-translational modifications (PTMs)?
    PTMs are covalent alterations that control protein activity after translation has been completed.
  • When do post-translational modifications occur during protein synthesis?
    PTMs occur after the polypeptide chain has been formed from mRNA during translation.
  • What does the abbreviation PTM stand for?
    PTM stands for post-translational modification.
  • Name four common types of post-translational modifications.
    The four common types are methylation, acetylation, ubiquitination, and phosphorylation.
  • What is methylation in the context of PTMs?
    Methylation is the addition of a methyl group (CH3) to a protein.
  • What is acetylation in post-translational modification?
    Acetylation is the process of adding an acetyl group to a protein.
  • What is ubiquitination?
    Ubiquitination is the addition of a ubiquitin group, which is a small protein, to another protein.
  • What does phosphorylation involve?
    Phosphorylation involves adding a phosphate group to a protein after translation.
  • What is hydroxylation as a PTM?
    Hydroxylation is the addition of a hydroxyl group to a protein.
  • What is lipidation?
    Lipidation is the process of adding a lipid to a protein.
  • What are disulfide bonds in the context of PTMs?
    Disulfide bonds are covalent links that can connect two separate proteins or occur within the same protein.
  • What is sulfonation?
    Sulfonation is the addition of a sulfur group to a protein.
  • What is glycosylation?
    Glycosylation is the addition of a carbohydrate to a protein.
  • Why is it important to know specific PTMs for your course?
    Familiarity with specific PTMs may depend on individual course requirements or your professor's focus.
  • Why are PTMs called 'post-translational'?
    They are called 'post-translational' because they occur after translation, which is the process of building proteins from mRNA.