MCQs on Nucleus Multiple Choice Questions and Answers

MCQs on Nucleus Multiple Choice Questions and Answers

Nucleus – Definition


Nucleus is the most conspicuous organelle in the eukaryotic cell. It function is to controls all the activities of the cell because it contains most of the genes. Its average diameter is approximately 6 micrometers (µm) in the animal cells. Moreover it stores the genetic information and transfer them during cell division from one cell to the other.

Course Content:

  • Introduction
  • Functions of nucleus
  • Nuclear envelope
  • Chromosomes
  • Nucleolus

All of these Zoology MCQs are preferably for test / interview preparation for BSc, MSc, BS (Hons), NTS, FPSC, PPSC, PTS, CSS and all other competitive examination for foreign study including overseas students.

Read More: MCQs on Vesicles Questions and Answers


Nucleus MCQs (Questions and Answers)


Q1. Nucleus is found in:

  1. prokaryotes
  2. eukaryotes
  3. both
  4. none

Answer: b

Q2. Which cell component controls the metabolic activities of the cells?

  1. Cytoplasm
  2. Mitochondria
  3. Cytoskeleton
  4. Nucleus

Answer: d

Q3. Which of the following present in nucleus that controls the cell?

  1. RNA
  2. Ribosomes
  3. Genes
  4. Chromosomes

Answer: c

Q4. In which process the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA)?

  1. Translation
  2. Transcription
  3. Genetic unity
  4. None

Answer: b

Q5. Transcription is the process of making an RNA copy of a gene sequence. Where this process takes place in the cell?

  1. Cytoplasm
  2. Nucleus
  3. Endoplasmic reticulum
  4. Golgi body

Answer: b

Q6. The mRNA is used in the synthesis of proteins by translation process.                                                                                                                                                                       True/false

Answer: True

Q7. Which of the following store the genetic information?

  1. Centrioles
  2. Cytoplasm
  3. Nucleus
  4. RNA

Answer: c

Q8. The nucleus is enclosed by:

  1. cell membrane
  2. nuclear envelope
  3. nucleolus
  4. cytoplasm

Answer: b

Q9. Which separates the nuclear contents from the cytoplasm

  1. Nucleolus
  2. Cell membrane
  3. vesicles
  4. nuclear envelope

Answer: d

Q10. The nuclear side of the inner membrane contained:

  1. a layer of protein
  2. a layer of lipid
  3. a layer of phospholipid
  4. a layer of enzymes

Answer: a

Q11. The nuclear envelope is perforated by pores.     True/False

Answer: True 

Q12. Which helps to maintain the shape of the nucleus and maintain the organization of the genetic material?

  1. A layer of lipid
  2. Nucleolus
  3. A layer of protein
  4. Cytoskeleton

Answer: c

Q13. With which organelle, the nuclear envelope’s pores give the nucleus direct contact?

  1. Mitochondria
  2. Endoplasmic reticulum ER
  3. Golgi body
  4. Cytoplasm

Answer: b

Q14. The diameter of the nuclear envelope’s pores is about 110 nm.    True/False

Answer: False (100nm)

Q15. The nuclear envelope’s pores regulate the movement of macromolecules and particles.                                                                                                                                                              True/False

Answer: True

Q16. Which is/are composed of globular and filamentous granules of proteins?

  1. Nucleus
  2. Nuclear pores
  3. Nucleolus
  4. Nuclear envelope

Answer: b

Q17. The nuclear envelope is a single membrane.               True/False

Answer: False (double membrane)

Q18. Which substance prevents the DNA from leaving the nucleus?

  1. Nuclear envelope
  2. Nucleolus
  3. The size of nuclear pores
  4. None

Answer: c

Q19. The size of nuclear pores allows the RNA to move out of the nucleus.        True/False

Answer: True

Q20. Where the process of translation takes place in the cell?

  1. Centrioles
  2. Cytoplasm
  3. Ribosomes
  4. Lysosomes

Answer: c

Q21. The nucleoplasm is the inner mass of the nucleus.       True/False

Answer: True

Q22. Where the chromosomes are present in the nucleus?

  1. Nucleoplasm
  2. Nucleolus
  3. Nuclear membrane
  4. None

Answer: a

Q23. When DNA is organized with proteins, it forms _______________.

  1. RNA
  2. mRNA
  3. Chromosomes
  4. A copy of DNA

Answer: c

Q24. The chromosomes are thread-like during interphase.     True/False

Answer: True

Q25. The stained material of chromosomes is collectively called as chromatin.    True/False

Answer: True

Q26. How many chromosomes are present in the nucleus of human cell?

  1. 46
  2. 48
  3. 42
  4. 40

Answer: a

Q27. The ribosomes contain genes.   True/False

Answer: False (chromosomes)

Q28. The sex cells of human contain how many chromosomes?

  1. 46
  2. 23
  3. 48
  4. 28

Answer: b

Q29. The chromosomes condense before the division of cell.       True/False

Answer: True 

Q30. Which is the most visible structure within the non dividing nucleus?

  1. Nucleoplasm
  2. Nuclear envelope
  3. Nucleolus
  4. None

Answer: c

Q31. The nucleolus is a membrane bound structure.   True/False

Answer: False (non-membranous)

Q32. The function of the  nucleolus is to synthesize ____________.

  1. Chromosomes
  2. Ribosomes
  3. Lysosomes
  4. Proteins

Answer: b

Q33. How many ribosomes can produce by an actively growing cell per minute?

  1. 5,000
  2. 8,000
  3. 10,000
  4. 12,000

Answer: c

Q34. Which are present at nucleolar organizers?

  1. Nucleoli
  2. Ribosomes
  3. Chromosomes
  4. DNA

Answer: a

Q35. Which is roughly spherical and appears as mass of densely stained granules under the electron microscope?

  1. Mitochondria
  2. Ribosomes
  3. Nucleolus
  4. Nucleus

Answer: c

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