Cell: The Unit of Life Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is correct about the rough endoplasmic reticulum (RER)?

The RER is involved in lipid synthesis.
The RER has ribosomes on its surface.
The RER stores genetic material.
The RER produces glucose during photosynthesis.
2

The rough endoplasmic reticulum (RER) is studded with ribosomes, making it a site for protein synthesis.

Which organelle is responsible for detoxification of harmful substances in liver cells?

Rough endoplasmic reticulum
Smooth endoplasmic reticulum
Mitochondria
Golgi apparatus
2

The smooth endoplasmic reticulum (SER) plays a key role in detoxifying harmful substances, especially in liver cells.

Which type of cell lacks a well-defined nucleus?

Prokaryotic cell
Eukaryotic cell
Plant cell
Animal cell
1

Prokaryotic cells lack a well-defined nucleus as their genetic material is not enclosed within a nuclear membrane.

Which component of the cytoskeleton provides mechanical strength to cells?

Microtubules
Microfilaments
Intermediate filaments
Centrioles
3

Intermediate filaments provide mechanical strength and structural support to cells (NCERT, Chapter 8, page 138). Microtubules aid in transport and division, microfilaments enable motility, and centrioles organize microtubules.

Which type of vacuole in animal cells stores ingested food particles?

Contractile vacuole
Food vacuole
Central vacuole
Storage vacuole
2

Food vacuoles in animal cells, especially in protists, store ingested food particles for digestion (NCERT, Chapter 8, page 135). Contractile vacuoles regulate water, central vacuoles are plant-specific, and storage vacuoles hold nutrients in plants.

Which bacterial structure aids in attachment to surfaces?

Mesosome
Fimbriae
Plasmid
Nucleoid
2

Fimbriae are hair-like structures on bacterial surfaces that aid in attachment to surfaces or other cells (NCERT, Chapter 8, page 130). Mesosomes assist in respiration, plasmids carry genes, and the nucleoid stores DNA.

Which of the following is incorrect about ribosomes?

Ribosomes are involved in protein synthesis.
Ribosomes are membrane-bound organelles.
Ribosomes are found in both prokaryotic and eukaryotic cells.
Ribosomes can be free-floating or attached to the ER.
2

Ribosomes are not membrane-bound organelles; they are protein-RNA complexes responsible for protein synthesis.

Which part of the mitochondrion contains enzymes for the electron transport chain?

Outer membrane
Intermembrane space
Cristae
Matrix
3

The cristae (inner folds of the mitochondrial membrane) house enzymes for the electron transport chain, crucial for ATP production.

Which part of the nucleus is responsible for the synthesis of ribosomal RNA (rRNA)?

Nuclear envelope
Nucleoplasm
Nucleolus
Chromatin
3

The nucleolus is a dense region within the nucleus responsible for the synthesis of ribosomal RNA (rRNA) and ribosome assembly.

Which of the following statements about the nuclear envelope is correct?

The nuclear envelope is a single-layered membrane.
The nuclear envelope is permeable to all substances.
The nuclear envelope has pores that regulate material exchange.
The nuclear envelope produces ATP for the cell.
3

The nuclear envelope is a double membrane with pores that regulate the exchange of materials between the nucleus and cytoplasm.

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