Cell The Unit Of Life Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which structure in a bacterial cell is responsible for genetic exchange?

Plasmid
Ribosome
Mesosome
Capsule
1

Plasmids are small, circular DNA molecules that can be exchanged between bacteria, enabling genetic recombination.

Which bacterial structure stores reserve materials like glycogen and phosphate?

Ribosomes
Plasmids
Inclusion bodies
Fimbriae
3

Inclusion bodies in prokaryotic cells store reserve materials such as glycogen granules, phosphate granules, and cyanophycean granules.

Which of the following statements about the cytoskeleton is incorrect?

The cytoskeleton maintains cell shape and structure.
The cytoskeleton is made of microfilaments, microtubules, and intermediate filaments.
The cytoskeleton is found only in prokaryotic cells.
The cytoskeleton is involved in intracellular transport.
3

The cytoskeleton is found in eukaryotic cells, not exclusively in prokaryotic cells, and it provides structural support and facilitates movement.

Which organelle in animal cells helps form spindle fibers during cell division?

Centrosome
Lysosome
Golgi apparatus
Peroxisome
1

The centrosome, containing centrioles, is responsible for organizing microtubules and forming spindle fibers during mitosis.

Which structure in eukaryotic cells is continuous with the outer nuclear membrane?

Golgi apparatus
Rough endoplasmic reticulum
Mitochondrion
Lysosome
2

The rough endoplasmic reticulum is continuous with the outer membrane of the nuclear envelope, forming a network for protein synthesis (NCERT, Chapter 8, page 131). Golgi apparatus, mitochondria, and lysosomes are not continuous with the nuclear membrane.

Which of the following is correct about the cytoplasm?

The cytoplasm is found only in prokaryotic cells.
The cytoplasm is the site for most cellular activities.
The cytoplasm stores genetic information.
The cytoplasm is a solid, rigid structure.
2

The cytoplasm is the site for most cellular activities, including metabolic pathways such as glycolysis.

Which structure in eukaryotic cells stores non-living substances like glycogen?

Nucleus
Cell inclusions
Mitochondrion
Golgi apparatus
2

Cell inclusions are non-living substances like glycogen, lipids, or pigments stored in the cytoplasm of eukaryotic cells (NCERT, Chapter 8, page 129). The nucleus stores DNA, mitochondria produce ATP, and the Golgi apparatus modifies proteins.

Which of the following statements about vacuoles is incorrect?

Vacuoles store nutrients and waste products.
Vacuoles help maintain turgor pressure in plant cells.
Vacuoles are found only in animal cells.
Vacuoles can store pigments.
3

Vacuoles are found in both plant and animal cells, although they are larger and more prominent in plant cells.

Which of the following is correct about the plasma membrane?

The plasma membrane is composed mainly of carbohydrates.
The plasma membrane is selectively permeable.
The plasma membrane contains only proteins.
The plasma membrane is a rigid structure.
2

The plasma membrane is selectively permeable, allowing the regulated movement of substances in and out of the cell.

Which type of chromosome has its centromere located very close to one end, forming a very short and a very long arm?

Metacentric
Sub-metacentric
Acrocentric
Telocentric
3

Acrocentric chromosomes have the centromere positioned very close to one end, resulting in a very short and a very long arm.

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