Welcome to the Cell Nucleus MDCAT MCQs with Answers. In this post, we have shared Cell Nucleus Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Cell Nucleus MCQs in this MDCAT Online Test.
What is the primary function of the nucleus in a cell?
a) Protein synthesis
b) Cellular respiration
c) DNA storage and replication
d) Energy production
What structure separates the nucleus from the cytoplasm?
a) Plasma membrane
b) Endoplasmic reticulum
c) Nuclear envelope
d) Golgi apparatus
Which of the following is found inside the nucleus?
a) Mitochondria
b) Ribosomes
c) Chromatin
d) Lysosomes
Which organelle is responsible for synthesizing ribosomal RNA (rRNA)?
a) Golgi apparatus
b) Nucleolus
c) Rough ER
d) Lysosome
What is the function of nuclear pores?
a) To store DNA
b) To synthesize proteins
c) To allow transport of molecules between the nucleus and cytoplasm
d) To produce energy
Which of the following is a characteristic of eukaryotic cells but not prokaryotic cells?
a) Presence of ribosomes
b) Presence of a nucleus
c) Presence of a cell wall
d) Presence of a plasma membrane
What is the nucleolus primarily responsible for?
a) DNA replication
b) RNA synthesis
c) Protein degradation
d) Lipid synthesis
What is chromatin composed of?
a) DNA only
b) Proteins only
c) RNA only
d) DNA and proteins
Which of the following best describes the nuclear envelope?
a) Single-layered membrane
b) Double-layered membrane
c) Made of proteins only
d) Found in prokaryotes
Where does transcription occur in the cell?
a) Cytoplasm
b) Ribosome
c) Nucleus
d) Endoplasmic reticulum
What is the role of histones in the nucleus?
a) To degrade DNA
b) To help package DNA into chromatin
c) To synthesize proteins
d) To transcribe RNA
During which phase of the cell cycle is the nuclear envelope broken down?
a) Interphase
b) Prophase
c) Anaphase
d) Telophase
Which of the following is true about the nucleoplasm?
a) It is responsible for ATP production
b) It is the fluid within the nucleus
c) It transports proteins out of the cell
d) It synthesizes ribosomal proteins
What is the function of nuclear lamina?
a) To assist in DNA replication
b) To provide structural support to the nucleus
c) To store lipids
d) To produce ribosomes
Which organelle is continuous with the outer membrane of the nuclear envelope?
a) Mitochondria
b) Rough endoplasmic reticulum
c) Lysosome
d) Golgi apparatus
What happens to the nuclear envelope during mitosis?
a) It thickens
b) It breaks down
c) It forms new organelles
d) It remains intact
What is the main function of chromatin in the nucleus?
a) To produce energy
b) To code for proteins
c) To package and organize DNA
d) To synthesize lipids
Which of the following structures is absent in prokaryotic cells?
a) Ribosomes
b) Plasma membrane
c) Nucleus
d) Cytoplasm
Which stage of the cell cycle is associated with the replication of DNA?
a) G1 phase
b) G2 phase
c) S phase
d) M phase
What is the genetic material inside the nucleus called when the cell is not dividing?
a) Chromosomes
b) Chromatin
c) Centrioles
d) Centromeres
In which process is the nucleus involved?
a) Cellular respiration
b) Transcription
c) Protein degradation
d) Lipid synthesis
Which structure ensures the faithful transmission of genetic material during cell division?
a) Ribosome
b) Chromosome
c) Endoplasmic reticulum
d) Golgi apparatus
How is the nuclear envelope reformed during mitosis?
a) It is synthesized anew
b) It forms from vesicles during telophase
c) It disintegrates into the cytoplasm
d) It is produced by the Golgi apparatus
What is the function of nucleoplasm?
a) To synthesize proteins
b) To provide a medium for nuclear reactions
c) To transport RNA
d) To store energy
Which organelle is involved in the post-transcriptional modification of RNA?
a) Endoplasmic reticulum
b) Nucleus
c) Ribosome
d) Lysosome
Where are ribosomal subunits assembled?
a) Nucleus
b) Cytoplasm
c) Nucleolus
d) Rough ER
What is the nucleolus composed of?
a) Lipids and proteins
b) DNA and proteins
c) RNA and proteins
d) RNA and lipids
Which phase of mitosis involves the reformation of the nuclear envelope?
a) Prophase
b) Metaphase
c) Telophase
d) Anaphase
What structure within the nucleus is primarily involved in producing ribosomes?
a) Nucleolus
b) Chromosomes
c) Endoplasmic reticulum
d) Golgi apparatus
Which component of the nucleus stores genetic information?
a) Nucleolus
b) Chromatin
c) Endoplasmic reticulum
d) Ribosomes
Which of the following is an incorrect function of the nucleus?
a) Storing genetic material
b) Producing ATP
c) Regulating gene expression
d) Directing protein synthesis
In which phase of the cell cycle does the nuclear membrane reform?
a) Prophase
b) Metaphase
c) Telophase
d) Anaphase
What process occurs in the nucleolus?
a) DNA replication
b) Lipid synthesis
c) Ribosomal RNA synthesis
d) Protein degradation
Which molecule is synthesized within the nucleus and carries genetic information to the cytoplasm?
a) DNA
b) tRNA
c) mRNA
d) rRNA
What structure is found within the nuclear envelope and regulates what enters and exits the nucleus?
a) Nuclear pores
b) Ribosomes
c) Nucleolus
d) Chromatin
What is the function of the nuclear matrix?
a) ATP synthesis
b) Protein production
c) Structural support for the nucleus
d) Enzyme degradation
Which stage of the cell cycle is associated with the replication of the nucleus?
a) G1 phase
b) S phase
c) G2 phase
d) M phase
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