W10L19 - The nucleus MCQ

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Created by
Nisa

Cards (8)

  • Which of the following does the nucleus have?
    1. Chromatin
    2. Double membrane
    3. Envelope
    4. Golgi
    5. Inner membrane
    6. Lysosomes
    7. Meshwork of intermediate filaments
    8. Mitochondria
    9. Nucleolus
    10. Nucleoskeleton
    11. Organisation
    12. Outer membrane
    13. Perinuclear space
    14. Pores
    15. Single membrane
    16. Structure
    1, 2, 3, 5, 7, 9, 10, 11, 12, 13, 14, 16
  • The nucleus has a defined structure and internal organisation. The nucleus is surrounded by a double membrane (the nuclear envelope); hence, it has an inner and outer membrane with a perinuclear space. The nucleus contains chromatin, has a meshwork of intermediate filaments that form the nucleoskeleton and contains a nucleolus. The nucleus does not contain Golgi, Lysosomes, or Mitochondria, and it does not have a single membrane.
  • Which of the following are carried out in the nucleus?
    1. Gene transcription
    2. Gene translation
    3. Protein production
    4. Ribosome assembly
    5. cDNA production
    6. mRNA production
    7. mRNA splicing
    8. rRNA cleavage
    9. rRNA production
    10. tRNA production
    1, 4, 6, 7, 8, 9, 10
  • mRNA,rRNA and tRNA are all produced in the nucleus by gene transcription. The splicing of mRNA, to remove introns, occurs in the nucleus, as does the cleavage of rRNA to make the different rRNA molecules. Finally, ribosomal proteins are imported into the nucleus, so the small and large subunits of the ribosomes can be formed. Genes are not translated, cDNA is not produced (cDNA is produced by the reverse transcription of mRNA) and proteins are not produced (this occurs in the cytosol).
  • Which of the following are true?
    1. No transport is allowed through the pore
    2. The nuclear pore consists of one protein molecule
    3. The nuclear pore contains several hundred protein subunits
    4. The nuclear pore contains several thousand protein subunits
    5. The nucleus has a few hundred pores
    6. The nucleus has around 50 pores
    7. The nucleus has one pore
    8. The nucleus has several thousand pores
    9. The nucleus has tens of thousands of pores
    10. Transport through the nuclear pore can occur in both directions
    11. Transport through the nuclear pore is gated
    12. Transport through the nuclear pore is not gated
    3, 8, 10, 11
  • Which of the following are true?
    1. Large molecules (> 60 kDa) can diffuse rapidly through the nuclear pore
    2. Large molecules (> 60 kDa) move slowly through the pore
    3. Large molecules (> 60 kDa) need import and export signals
    4. Molecules between 5 - 60 kDa can diffuse rapidly through the nuclear pore
    5. Molecules between 5 - 60 kDa move slowly through the pore
    6. Molecules between 5 - 60 kDa need import and export signals
    7. Small molecules (< 5 kDa) can diffuse rapidly through the nuclear pore
    8. Small molecules (< 5 kDa) move slowly through the pore
    3, 5, 7
  • Which of the following are true for rRNA?
    1. Cells contain around hundred copies of the gene encoding rRNA
    2. Cells contain around ten copies of the gene encoding rRNA
    3. Cells contain multiple copies, around 200, of the gene encoding rRNA
    4. Cells contain only one copy of the gene encoding rRNA
    5. rRNA is produced from cDNA
    6. rRNA is produced from mRNA
    7. rRNA is produced from rDNA
    8. rRNA is produced from tRNA
    9. rRNA makes up a large amount, up to 80%, of the total RNA in a cell
    10. rRNA makes up a small amount, up to 8%, of the total RNA in a cell
    3, 7, 9
  • Roughly how many ribosomes per cell?
    around 10 million