Download NEET MCQs for NEET Biology: Cell The Unit of Life
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Chapter-wise Objective Questions: Cell The Unit of Life
Access the complete set of multiple-choice questions for Cell The Unit of Life below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official NEET textbooks.
Multiple Choice Questions
(a) Synthesis of food
(b) Help in cell wall formation
(c) Help in DNA replication
(d) Distribution of DNA to daughter cells
Show Answer & Explanation
Answer: (a) Synthesis of food
Explanation:
1. Mesosomes help in wall formation, DNA replication, distribution of DNA, and increase surface area for enzymes
2. They do not synthesise food.
Teacher's Note:
1. Mesosome is an infolding of the plasma membrane.
(a) 50 and 50
(b) 60 and 40
(c) 52 and 40
(d) 40 and 52
Show Answer & Explanation
Answer: (c) 52 and 40
Explanation:
1. Human RBC membrane has about 52 per cent protein and 40 per cent lipid.
Teacher's Note:
1. The remainder is carbohydrates.
(a) Lipids
(b) Proteins
(c) Carbohydrates
(d) Cholesterol
Show Answer & Explanation
Answer: (a) Lipids
Explanation:
1. Quasi-fluid lipids allow lateral movement of membrane components.
Teacher's Note:
1. Lipid fluidity is an essential property.
(a) Fluid mosaic model is widely accepted
(b) Quasi-fluid nature of lipids enables lateral movement of proteins
(c) All types of molecules can easily pass through the membrane
(d) Fluid nature is also important for cell growth and formation of intercellular junctions
Show Answer & Explanation
Answer: (c) All types of molecules can easily pass through the membrane
Explanation:
1. The membrane is selectively permeable and not all molecules can pass freely.
Teacher's Note:
1. Selective permeability is the key property.
(a) Positively charged solutes
(b) Negatively charged solutes
(c) Neutral solutes
(d) Any of the above
Show Answer & Explanation
Answer: (c) Neutral solutes
Explanation:
1. Neutral solutes can diffuse down the gradient through the lipid bilayer.
Teacher's Note:
1. Charged ions need channels.
(a) Neutral solutes can move along the gradient across the non-polar lipid bilayer
(b) Water can also move along its gradient across the bilayer
(c) Non-polar molecules cannot pass through the non-polar lipid bilayer
(d) Na+ and K+ can move across the membrane by active transport
Show Answer & Explanation
Answer: (c) Non-polar molecules cannot pass through the non-polar lipid bilayer
Explanation:
1. Non-polar molecules dissolve in the lipid bilayer and pass through it easily.
Teacher's Note:
1. Polar molecules need carriers.
(a) Protection from mechanical damage and infection
(b) Cell to cell interaction
(c) Barrier to undesirable macromolecules
(d) Secretion
Show Answer & Explanation
Answer: (d) Secretion
Explanation:
1. The cell wall protects, helps cell interaction and acts as a barrier but does not secrete.
Teacher's Note:
1. Cell wall is a non-living covering.
(a) Cellulose
(b) Galactans
(c) Mannans
(d) Hemicellulose
Show Answer & Explanation
Answer: (d) Hemicellulose
Explanation:
1. Algal cell walls contain cellulose, galactans, mannans and minerals, but not hemicellulose.
Teacher's Note:
1. Plant walls have hemicellulose and pectin.
(a) ER, Golgi complex, lysosome and nucleus
(b) ER, Golgi complex, lysosome and vacuole
(c) ER, Golgi complex, lysosome and microbodies
(d) ER, Golgi complex, plastids and vacuole
Show Answer & Explanation
Answer: (b) ER, Golgi complex, lysosome and vacuole
Explanation:
1. The endomembrane system includes ER, Golgi complex, lysosomes and vacuoles.
Teacher's Note:
1. Mitochondria and plastids are not included.
(a) ER divides the intracellular space into two compartments
(b) RER is frequently seen in cells actively involved in secretion
(c) In animals, steroidal hormones are synthesised in RER
(d) SER is the major site of lipid synthesis
Show Answer & Explanation
Answer: (c) In animals, steroidal hormones are synthesised in RER
Explanation:
1. Steroid hormones are synthesised in the smooth ER.
Teacher's Note:
1. Smooth ER lacks ribosomes.
(a) Cis face
(b) Trans face
(c) Concave face
(d) Maturing face
Show Answer & Explanation
Answer: (a) Cis face
Explanation:
1. The cis (forming) face receives material from the ER, and the trans (maturing) face releases it.
Teacher's Note:
1. The cis face is convex.
(a) Its enzymes work close to the ER
(b) It receives material from the ER for packaging
(c) It becomes active close to the ER
(d) All of the above
Show Answer & Explanation
Answer: (b) It receives material from the ER for packaging
Explanation:
1. The Golgi receives material from the ER for packaging and secretion.
Teacher's Note:
1. Vesicles bud off from the ER.
(a) Cilia are small and flagella are long
(b) Cilia can move either the cell or the surrounding fluid
(c) Flagella are responsible for movement of the surrounding fluid
(d) Cilia work like oars
Show Answer & Explanation
Answer: (c) Flagella are responsible for movement of the surrounding fluid
Explanation:
1. Flagella are responsible for the movement of the cell, whereas cilia can move the cell or the surrounding fluid.
Teacher's Note:
1. Flagella move like whips.
(a) Shaft
(b) Axoneme
(c) Radial spoke
(d) Arms
Show Answer & Explanation
Answer: (b) Axoneme
Explanation:
1. The central core is the axoneme, with a 9+2 arrangement of microtubules.
Teacher's Note:
1. It is surrounded by the plasma membrane.
(a) Peripheral doublets
(b) Central singlet microtubules
(c) One of the peripheral doublets to the central sheath
(d) Two successive peripheral doublets
Show Answer & Explanation
Answer: (c) One of the peripheral doublets to the central sheath
Explanation:
1. Radial spokes link each peripheral doublet to the central sheath
2. Interdoublet bridges link the doublets.
Teacher's Note:
1. 9+2 arrangement.
(a) Parallel
(b) Perpendicular
(c) Oblique
(d) None of the above
Show Answer & Explanation
Answer: (b) Perpendicular
Explanation:
1. The two centrioles in a centrosome lie at right angles to each other.
Teacher's Note:
1. Each has a cartwheel organisation.
(a) A-II, B-IV, C-I, D-III
(b) A-II, B-IV, C-III, D-I
(c) A-I, B-II, C-III, D-IV
(d) A-IV, B-III, C-II, D-I
Show Answer & Explanation
Answer: (a) A-II, B-IV, C-I, D-III
Explanation:
1. Brown described the nucleus, Flemming named chromatin by staining, Palade saw ribosomes (ribonucleoprotein particles) and Golgi described the packaging organelle.
Teacher's Note:
1. Link each scientist with the discovery.
(a) rRNA
(b) mRNA
(c) tRNA
(d) nRNA
Show Answer & Explanation
Answer: (a) rRNA
Explanation:
1. The nucleolus is the site of rRNA synthesis and ribosome assembly.
Teacher's Note:
1. It is not membrane bound.
(a) Structure
(b) Number of telomeres
(c) Position of the centromere
(d) Position of the kinetochore
Show Answer & Explanation
Answer: (c) Position of the centromere
Explanation:
1. Chromosomes are classified as metacentric, submetacentric, acrocentric and telocentric by the position of the centromere.
Teacher's Note:
1. The centromere carries the kinetochores.
(a) Metacentric
(b) Submetacentric
(c) Acrocentric
(d) Telocentric
Show Answer & Explanation
Answer: (b) Submetacentric
Explanation:
1. Submetacentric chromosomes have the centromere slightly off centre, giving one shorter and one longer arm.
Teacher's Note:
1. Metacentric has a middle centromere.
(a) A-IV, B-II, C-III, D-I
(b) A-IV, B-III, C-II, D-I
(c) A-I, B-II, C-III, D-IV
(d) A-I, B-IV, C-III, D-II
Show Answer & Explanation
Answer: (b) A-IV, B-III, C-II, D-I
Explanation:
1. Metacentric: middle; submetacentric: slightly off centre; acrocentric: very near the end; telocentric: terminal.
Teacher's Note:
1. The shape depends on the arm length.
(a) Non-staining
(b) Constant position
(c) Known as satellite
(d) Present in some chromosomes
Show Answer & Explanation
Answer: (c) Known as satellite
Explanation:
1. The secondary constriction is the non-staining region, and the satellite is the segment beyond it
2. They are not the same.
Teacher's Note:
1. Secondary constrictions are the NOR sites.
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FAQs
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