Cell Nucleus Structure and Function
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What is the function of the nuclear lamina?

  • Aids in the bidirectional movement of molecules
  • Transcribes rRNA and processes ribosomal subunits
  • Maintains the shape and stability of the nuclear envelope (correct)
  • Facilitates the import and export of macromolecules
  • Which component of the nucleus is responsible for rRNA synthesis?

  • Dense fibrillar component
  • Fibrillar centre (correct)
  • Granular component
  • Nuclear speckles
  • What is directly involved in the regulation of nuclear processes such as transcription and DNA replication?

  • Lamins (correct)
  • TF factors
  • Helicases
  • Histones
  • What is the primary function of transport receptors like importins and exportins?

    <p>Facilitate the movement of macromolecules in and out of the nucleus</p> Signup and view all the answers

    What is the role of nuclear bodies within the nucleus?

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

    Which molecules pass through specific aqueous channels in nuclear pore complexes passively?

    <p>Water-soluble molecules</p> Signup and view all the answers

    What process results in the dissolution of the nuclear envelope during prophase of mitotic division?

    <p>Phosphorylation of lamins and integral proteins</p> Signup and view all the answers

    What is the site of ribosomal subunits assembly within the nucleolus?

    <p>Granular component</p> Signup and view all the answers

    Which structure binds DNA with the nuclear envelope?

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

    What is attached to nuclear pores and integral proteins of the inner nuclear membrane?

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

    What polymerase transcribes the 5S rRNA genes located on chromosome 1?

    <p>RNA polymerase III</p> Signup and view all the answers

    When does the nucleolus disassemble and begin to reassemble?

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

    Where are ribosomal proteins synthesized before being assembled with rRNAs to form ribosomal subunits?

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

    What is the main function of nuclear speckles in the cell?

    <p>Pre-mRNA splicing</p> Signup and view all the answers

    Which nuclear bodies participate in the cellular response to stress like heat, chemicals, and ultraviolet light?

    <p>Nuclear stress bodies</p> Signup and view all the answers

    What is the function of transcription factories within the nucleus?

    <p>Gene transcription and RNA processing</p> Signup and view all the answers

    Where do Cajal bodies primarily carry out their functions?

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

    What determines the size of the nucleolus in a cell?

    <p>Metabolic activity of the cell</p> Signup and view all the answers

    '47S pre-rRNA' contains which types of rRNAs?

    <p>'5.8S, 18S, and 28S rRNAs'</p> Signup and view all the answers

    What is the function of the nucleus in a cell?

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

    Which part of the nucleus is involved in the exchange of molecules between the perinuclear space and the nuclear interior?

    <p>Inner nuclear membrane</p> Signup and view all the answers

    What is the function of nuclear pores in the nuclear envelope?

    <p>Exchange of molecules between cytoplasm and nucleus</p> Signup and view all the answers

    Which structure spans the whole nuclear envelope and facilitates molecule exchange?

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

    What is the function of the nuclear lamina in relation to the nuclear envelope?

    <p>Provides structural support to the nucleus</p> Signup and view all the answers

    How many nuclear pores does a typical mammalian cell contain in its nuclear envelope?

    <p>~3000-4000</p> Signup and view all the answers

    What is the function of the nuclear interior referred to as nucleoplasm (karyoplasm)?

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

    Which part of the nucleus is continuous with the membrane of the endoplasmic reticulum?

    <p>Outer nuclear membrane</p> Signup and view all the answers

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