NEET 2025 MCQ with Answer Explanation : “Cell the unit of life”.

Question 70:
What is the primary function of the nuclear envelope?

A) Protect genetic material
B) Synthesize ribosomes
C) Produce ATP
D) Transport materials

Answer: A) Protect genetic material

Explanation: The nuclear envelope is a double membrane that surrounds the nucleus and protects the genetic material (DNA) from the cytoplasm.

Question 71:
Which organelle is responsible for producing energy in the form of ATP?

A) Nucleus
B) Ribosomes
C) Mitochondria
D) Golgi Apparatus

Answer: C) Mitochondria

Explanation: Mitochondria are known as the powerhouse of the cell, producing ATP through cellular respiration.

Question 72:
Which type of junctions anchors cells to each other and provides mechanical stability?

A) Tight junctions
B) Gap junctions
C) Desmosomes
D) Hemidesmosomes

Answer: C) Desmosomes

Explanation: Desmosomes are specialized structures that anchor cells together, providing mechanical strength and stability to tissues.

Question 73:
Which of the following processes requires energy in the form of ATP?

A) Passive transport
B) Facilitated diffusion
C) Active transport
D) Osmosis

Answer: C) Active transport

Explanation: Active transport involves moving substances against their concentration gradient and requires energy, usually from ATP.

Question 74:
What is the primary function of the rough endoplasmic reticulum?

A) Lipid synthesis
B) Detoxification
C) Protein synthesis
D) Storage of genetic information

Answer: C) Protein synthesis

Explanation: The rough endoplasmic reticulum is studded with ribosomes and is primarily involved in synthesizing proteins that are either secreted or incorporated into membranes.

Question 75:
Which of the following structures is involved in the synthesis of ATP?

A) Nucleus
B) Golgi Apparatus
C) Mitochondria
D) Lysosome

Answer: C) Mitochondria

Explanation: Mitochondria are the sites of ATP production through oxidative phosphorylation during cellular respiration.

Question 76:
Which structure is responsible for protein degradation in the cell?

A) Ribosome
B) Nucleus
C) Lysosome
D) Golgi Apparatus

Answer: C) Lysosome

Explanation: Lysosomes contain enzymes that degrade proteins, lipids, and other macromolecules, playing a crucial role in cellular waste management.

Question 77:
What is the main component of the plant cell wall?

A) Chitin
B) Cellulose
C) Peptidoglycan
D) Glycogen

Answer: B) Cellulose

Explanation: Cellulose is a polysaccharide that forms the main structural component of the plant cell wall, providing rigidity and support.

Question 78:
What is the main role of the cytoplasm in eukaryotic cells?

A) Location of the nucleus
B) Site for metabolic processes
C) Production of ATP
D) Storage of genetic material

Answer: B) Site for metabolic processes

Explanation: The cytoplasm is the gel-like substance in which cellular organelles are suspended and where many metabolic processes occur.

Question 79:
Which type of transport does NOT require energy?

A) Active transport
B) Passive transport
C) Endocytosis
D) Exocytosis

Answer: B) Passive transport

Explanation: Passive transport occurs when substances move across the cell membrane along their concentration gradient without the use of energy.

Question 80:
What structure is involved in the assembly of ribosomal subunits?

A) Nucleus
B) Nucleolus
C) Golgi Apparatus
D) Ribosomes

Answer: B) Nucleolus

Explanation: The nucleolus is the site within the nucleus where ribosomal RNA (rRNA) is synthesized and ribosomal subunits are assembled.