Cell Biology - Cell Structure
Q. What is the basic structural and functional unit of life? (2020)
A.
Tissue
B.
Organ
C.
Cell
D.
Organism
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Solution
The cell is the basic structural and functional unit of life, as it is the smallest unit that can carry out all life processes.
Correct Answer: C — Cell
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Q. What is the function of lysosomes? (2018)
A.
Energy production
B.
Digestion of macromolecules
C.
Protein synthesis
D.
Cell division
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Solution
Lysosomes contain digestive enzymes that break down macromolecules, old cell parts, and microorganisms.
Correct Answer: B — Digestion of macromolecules
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Q. What is the function of the cytoskeleton? (2019)
A.
Energy production
B.
Cell shape and movement
C.
Protein synthesis
D.
DNA storage
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Solution
The cytoskeleton provides structural support, helps maintain cell shape, and is involved in cell movement.
Correct Answer: B — Cell shape and movement
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Q. What is the function of the rough endoplasmic reticulum? (2020)
A.
Lipid synthesis
B.
Protein synthesis
C.
Energy production
D.
Detoxification
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Solution
The rough endoplasmic reticulum is studded with ribosomes and is primarily involved in the synthesis of proteins.
Correct Answer: B — Protein synthesis
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Q. What is the jelly-like substance inside the cell called? (2018)
A.
Nucleoplasm
B.
Cytoplasm
C.
Protoplasm
D.
Chloroplast
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Solution
Cytoplasm is the jelly-like substance that fills the cell and contains organelles.
Correct Answer: B — Cytoplasm
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Q. What is the main component of the cell wall in plant cells? (2023)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
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Solution
The cell wall of plant cells is primarily made of cellulose, which provides structural support.
Correct Answer: A — Cellulose
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Q. What is the main function of the nucleus in a cell? (2019)
A.
Energy production
B.
Storage of genetic information
C.
Protein synthesis
D.
Cell division
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Solution
The nucleus stores the cell's genetic information and coordinates activities such as growth, metabolism, and reproduction.
Correct Answer: B — Storage of genetic information
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Q. What is the main function of the nucleus? (2019)
A.
Energy production
B.
Storage of genetic information
C.
Protein synthesis
D.
Cell division
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Solution
The nucleus stores genetic information and controls cellular activities by regulating gene expression.
Correct Answer: B — Storage of genetic information
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Q. What is the primary function of the cell wall? (2019)
A.
Energy storage
B.
Protection and support
C.
Protein synthesis
D.
Cell division
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Solution
The cell wall provides protection and support to the cell, maintaining its shape and preventing excessive water uptake.
Correct Answer: B — Protection and support
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Q. What is the primary function of the Golgi apparatus? (2021)
A.
Protein synthesis
B.
Modification and packaging of proteins
C.
Lipid synthesis
D.
Cell division
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Solution
The Golgi apparatus modifies, sorts, and packages proteins for secretion or delivery to other organelles.
Correct Answer: B — Modification and packaging of proteins
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Q. What is the primary function of the ribosomes? (2019)
A.
Energy production
B.
Protein synthesis
C.
Lipid synthesis
D.
DNA replication
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Solution
Ribosomes are responsible for protein synthesis by translating messenger RNA into polypeptide chains.
Correct Answer: B — Protein synthesis
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Q. What is the primary function of the rough endoplasmic reticulum? (2019)
A.
Lipid synthesis
B.
Protein synthesis
C.
Energy production
D.
Cell division
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Solution
The rough endoplasmic reticulum is studded with ribosomes and is primarily involved in the synthesis of proteins.
Correct Answer: B — Protein synthesis
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Q. What is the primary role of the cytoskeleton? (2022)
A.
Energy production
B.
Cell shape and movement
C.
Protein synthesis
D.
DNA replication
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Solution
The cytoskeleton provides structural support, helps maintain cell shape, and facilitates cell movement.
Correct Answer: B — Cell shape and movement
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Q. What structure regulates the entry and exit of substances in a cell? (2021)
A.
Cell Wall
B.
Nucleus
C.
Plasma Membrane
D.
Cytoplasm
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Solution
The plasma membrane regulates the entry and exit of substances in and out of the cell, maintaining homeostasis.
Correct Answer: C — Plasma Membrane
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Q. Which of the following is known as the powerhouse of the cell? (2020)
A.
Nucleus
B.
Mitochondria
C.
Ribosome
D.
Endoplasmic Reticulum
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Solution
Mitochondria are known as the powerhouse of the cell because they produce ATP, the energy currency of the cell.
Correct Answer: B — Mitochondria
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Q. Which of the following is NOT a component of the cell theory? (2018)
A.
All living things are composed of cells
B.
Cells are the basic unit of life
C.
All cells arise from pre-existing cells
D.
Cells can arise spontaneously from non-living matter
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Solution
The cell theory states that all living things are composed of cells, cells are the basic unit of life, and all cells arise from pre-existing cells. Spontaneous generation is not part of the cell theory.
Correct Answer: D — Cells can arise spontaneously from non-living matter
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Q. Which of the following is NOT a function of the plasma membrane? (2019)
A.
Transport of materials
B.
Cell communication
C.
Energy production
D.
Barrier to external environment
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Solution
The plasma membrane does not produce energy; it primarily functions as a barrier and facilitates transport and communication.
Correct Answer: C — Energy production
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Q. Which of the following is not found in prokaryotic cells? (2022)
A.
Ribosomes
B.
Nucleus
C.
Plasma Membrane
D.
Cytoplasm
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Solution
Prokaryotic cells do not have a nucleus; their genetic material is not enclosed within a membrane.
Correct Answer: B — Nucleus
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Q. Which of the following organelles is involved in photosynthesis? (2022)
A.
Mitochondria
B.
Chloroplast
C.
Ribosome
D.
Golgi apparatus
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Solution
Chloroplasts are the organelles responsible for photosynthesis in plant cells, converting light energy into chemical energy.
Correct Answer: B — Chloroplast
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Q. Which of the following structures is found only in plant cells? (2022)
A.
Cell membrane
B.
Mitochondria
C.
Chloroplast
D.
Ribosome
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Solution
Chloroplasts are found only in plant cells and are responsible for photosynthesis.
Correct Answer: C — Chloroplast
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Q. Which organelle is involved in the digestion of waste materials in the cell? (2023)
A.
Lysosome
B.
Peroxisome
C.
Ribosome
D.
Vesicle
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Solution
Lysosomes contain digestive enzymes that break down waste materials and cellular debris.
Correct Answer: A — Lysosome
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Q. Which organelle is involved in the modification and packaging of proteins? (2020)
A.
Lysosome
B.
Golgi Apparatus
C.
Endoplasmic Reticulum
D.
Nucleus
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Solution
The Golgi apparatus modifies, sorts, and packages proteins for secretion or delivery to other organelles.
Correct Answer: B — Golgi Apparatus
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Q. Which organelle is involved in the synthesis of lipids? (2020)
A.
Rough endoplasmic reticulum
B.
Smooth endoplasmic reticulum
C.
Lysosome
D.
Peroxisome
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Solution
The smooth endoplasmic reticulum is involved in the synthesis of lipids and detoxification processes.
Correct Answer: B — Smooth endoplasmic reticulum
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Q. Which organelle is known for detoxifying harmful substances in the cell? (2022)
A.
Lysosome
B.
Peroxisome
C.
Ribosome
D.
Nucleus
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Solution
Peroxisomes are organelles that detoxify harmful substances and break down fatty acids.
Correct Answer: B — Peroxisome
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Q. Which organelle is responsible for packaging and modifying proteins? (2021)
A.
Lysosome
B.
Golgi apparatus
C.
Nucleus
D.
Chloroplast
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Solution
The Golgi apparatus modifies, sorts, and packages proteins for secretion or delivery to other organelles.
Correct Answer: B — Golgi apparatus
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Q. Which structure is responsible for controlling the entry and exit of substances in a cell? (2022)
A.
Cell wall
B.
Plasma membrane
C.
Cytoplasm
D.
Nucleus
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Solution
The plasma membrane regulates the movement of substances in and out of the cell, maintaining homeostasis.
Correct Answer: B — Plasma membrane
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Q. Which structure is responsible for maintaining the shape of plant cells? (2021)
A.
Cell membrane
B.
Cell wall
C.
Cytoplasm
D.
Chloroplast
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Solution
The cell wall provides structural support and maintains the shape of plant cells.
Correct Answer: B — Cell wall
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Q. Which structure is responsible for photosynthesis in plant cells? (2021)
A.
Mitochondria
B.
Chloroplast
C.
Ribosome
D.
Vacuole
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Solution
Chloroplasts are the organelles responsible for photosynthesis, converting light energy into chemical energy.
Correct Answer: B — Chloroplast
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Q. Which structure is responsible for the synthesis of ATP? (2022)
A.
Chloroplast
B.
Mitochondria
C.
Nucleus
D.
Golgi apparatus
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Solution
Mitochondria are responsible for the synthesis of ATP through cellular respiration.
Correct Answer: B — Mitochondria
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Q. Which structure is responsible for the synthesis of lipids? (2021)
A.
Smooth endoplasmic reticulum
B.
Rough endoplasmic reticulum
C.
Golgi apparatus
D.
Mitochondria
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Solution
The smooth endoplasmic reticulum is involved in the synthesis of lipids and detoxification processes.
Correct Answer: A — Smooth endoplasmic reticulum
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