Endoplasmic Reticulum (ER) Structure Quiz
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Questions and Answers

What is the main purpose of density gradient centrifugation in the context of relaxation-contraction coupling?

  • Transporting proteins to the Golgi apparatus
  • Separating rough endoplasmic reticulum (RER) from smooth endoplasmic reticulum (SER) (correct)
  • Isolating proteins synthesized on free ribosomes
  • Directing proteins to appropriate locations via signal sequences

    • Where are proteins synthesized on membrane-bound ribosomes translocated while their translation is in progress?

  • Nucleus
  • Chloroplasts
  • Mitochondria
  • Endoplasmic reticulum (ER) (correct)

    • What is the function of targeting proteins to ER signal sequences?

  • Transporting proteins to lysosomes
  • Directing the protein to appropriate location and removed after transport (correct)
  • Isolating proteins synthesized on free ribosomes
  • Separating rough endoplasmic reticulum (RER) from smooth endoplasmic reticulum (SER)

    • Where do proteins synthesized on free ribosomes remain or get transported to?

    <p>Nucleus, mitochondria, chloroplasts, or peroxisomes</p> Signup and view all the answers

    Which organelle is responsible for transporting proteins to lysosomes, the plasma membrane, or the cell exterior via secretory vesicles?

    <p>Golgi apparatus</p> Signup and view all the answers

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