Cell Organelles Quiz
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Questions and Answers

What is the role of the fibrillar centre within the nucleolus?

  • Site of rRNAs synthesis (correct)
  • Site of RNA polymerase I activity
  • Site of ribosomal subunits assembly
  • Site of pre-rRNA processing

    • Where are the genes for 5.8S, 18S, and 28S rRNAs located in humans?

  • On chromosome 1
  • In the granular component of the nucleolus
  • In the nucleolus
  • On the short arm of acrocentric chromosomes (correct)

    • What happens to the nucleolus at the beginning of mitosis?

  • Increases in size
  • Transfers 5S rRNA outside the nucleus
  • Disassembles (correct)
  • It begins to reassemble

    • What is the function of nuclear speckles?

    <p>Function in pre-mRNA splicing</p> Signup and view all the answers

    Where are ribosomal proteins synthesized before they are transported to the nucleolus?

    <p>In the cytoplasm</p> Signup and view all the answers

    What is the primary role of Cajal bodies?

    <p>Modification of small nuclear RNAs</p> Signup and view all the answers

    How do nucleoli typically form after cell division?

    <p>By forming one large nucleolus after fusing together</p> Signup and view all the answers

    Where are 5S rRNA genes located and what RNA polymerase transcribes them?

    <p>On chromosome 1, transcribed by RNA polymerase III</p> Signup and view all the answers

    What happens in nuclear stress bodies during cellular stress?

    <p>Translocation to the nucleus and activation of gene expression</p> Signup and view all the answers

    What happens to nucleoli at the beginning of mitosis and telophase?

    <p>They disassemble at the beginning of mitosis and reassemble in telophase</p> Signup and view all the answers

    What is the main function of the nucleus in a cell?

    <p>Storage of genetic information</p> Signup and view all the answers

    Which organelle is the nucleus NOT directly connected to?

    <p>Lysosomes</p> Signup and view all the answers

    What happens to the nucleus during cell division?

    <p>It disassembles</p> Signup and view all the answers

    Which part of the nucleus contains the genetic material?

    <p>Nuclear Interior</p> Signup and view all the answers

    What is the function of the inner nuclear membrane?

    <p>Molecule exchange</p> Signup and view all the answers

    Which organelle shares a membrane structure with the outer nuclear membrane?

    <p>Endoplasmic Reticulum</p> Signup and view all the answers

    What is the nuclear envelope made up of?

    <p>Double lipid bilayer</p> Signup and view all the answers

    What is the function of nuclear pores?

    <p>Allowing the bidirectional movement of molecules between the cytoplasm and nucleus</p> Signup and view all the answers

    What is the role of nucleoporins within the nuclear pore complex?

    <p>Constituting multiple copies of proteins in the complex</p> Signup and view all the answers

    How do small water-soluble molecules pass through the nuclear pores?

    <p>Via specific aqueous channels in the pore complex passively</p> Signup and view all the answers

    What is the primary function of nuclear lamina?

    <p>Bind DNA with the nuclear envelope</p> Signup and view all the answers

    Which structure plays a vital role during prophase of mitotic division?

    <p>Nuclear lamins</p> Signup and view all the answers

    What is found in the nuclear interior of a cell?

    <p>Chromatin, RNA molecules, and proteins</p> Signup and view all the answers

    Which structure is involved in intense rRNA transcription and ribosomal subunit assembly?

    <p>Nucleolus</p> Signup and view all the answers

    'Nuclear bodies' within the nucleus are best described as areas that:

    <p>Contain different proteins and are involved in specific processes</p> Signup and view all the answers

    'Importins' and 'exportins' are primarily involved in:

    <p>Importing and exporting macromolecules into and out of the nucleus, respectively</p> Signup and view all the answers

    What is the function of central transport channels in nuclear pores?

    <p>Facilitating bidirectional movement of molecules with specific binding sites for substrates</p> Signup and view all the answers

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