Cell: The Unit of Life

NEET Biology · 161 questions · Page 1 of 17 · Click an option or "Show Solution" to reveal answer

Which of the following pair of organelles does not contains DNA?

A Lysosomes and Vacuoles

B Nuclear envelope and Mitochondria

C Mitochodria and Lysosomes

D Chloroplast and Vacuoles

Correct Answer

Option A

Solution

Lysosome and vacuoles do not contain DNA.

The two sub-units of ribosome remain united at a critical ion level of :

A magnesium

B manganese

C calcium

D copper

Correct Answer

Option A

Solution

The two subunits of ribosome remain united at a critical ion level of magnesium.

The Phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as

A Secondary growth

B Differentiation

C Dedifferentiation

D Redifferentiation

Correct Answer

Option C

Solution

The phenomenon where certain living differentiated cells regain or attain their ability to divide and form new cells is known as dedifferentiation.

The Golgi complex participates in

A activation of amino acid

B fatty acid breakdown

C formation of secretory vesicles

D respiration in bacteria

Correct Answer

Option C

Solution

The Golgi apparatus receives proteins and lipids from the ER.

It modifies them, concentrates and packs them into secretory vesicles that are formed by budding off from the trans-Golgi surface.

Select the incorrect match.

A Allosomes Sex chromosomes

B Sub-metacentric chromosomes L-shaped chromosomes

C Lampbrush chromosomes Diplotene bivalents

D Polytene chromosomes Oocytes of amphibians

Correct Answer

Option D

Solution

Polytene chromosomes are found in salivary glands of insects and are also called as salivary chromosomes.

Which of the following is true for nucleolus?

A It takes part in spindle formation

B Larger nucleoli are present in dividing cells.

C It is a membrane-bound structure.

D It is a site for active ribosomal RNA synthesis.

Correct Answer

Option D

Solution

The nucleolus is a large, distinct, spheroidal subcompartment of the nucleus of eukaryote cells that is the site of ribosomal RNA (rRNA) synthesis and assembly of ribosomal subunits.

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?

A Ribosome

B Mitochondrion

C Chloroplast

D Lysosome

Correct Answer

Option B

Solution

The site of aerobic oxidation of carbohydrates in cells to generate ATP are mitochondria.

The osmotic expansion of a cell kept in water is chiefly regulated by:

A Vacuoles

B Plastids

C Mitochondria

D Ribosomes

Correct Answer

Option A

Solution

The vacuole is bound by a single membrane called tonoplast.

It functions as semipermeable membrane, allows osmotic entry or exit of water, concentration and storage of nutrients as well as wastes.

Which one of the following is not a constituent of cell membrane ?

A Glycolipids

B Proline

C Phospholipids

D Cholesterol

Correct Answer

Option B

Solution

Chemically a biomembrane consists of lipids (20-70%), proteins (20-70%), carbohydrates (1-5%) and water (20%).

The important lipids are phospholipids, sterols (e.g. cholesterol), glycolipids, sphingolipid.

Proline is an amino acid, not a membrane constituent.

Q10

In fluid mosaic model of plasma membrane

A Phospholipids form a bimolecular layer in middle part

B Upper layer is non-polar and hydrophilic

C Proteins form a middle layer

D Polar layer is hydrophobic

Correct Answer

Option A

Solution

Fluid mosaic model of plasma membrane proposes that plasma membrane comprises of a phospholipid bilayer wherein icebergs of proteins float in the sea of phospholipids.

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