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  4. Cell: The Unit of Life Chapter-Wise Test 3

Cell: The Unit of Life Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the role of the glycocalyx in prokaryotic cells?

Protein synthesis
Protection and adhesion
DNA replication
ATP production
2

The glycocalyx in prokaryotic cells is a polysaccharide or protein layer that aids in protection and adhesion to surfaces (NCERT, Chapter 8, page 130). Protein synthesis occurs in ribosomes, DNA replication in the nucleoid, and ATP production in mesosomes.

Which structure in animal cells facilitates adhesion between adjacent cells?

Gap junction
Tight junction
Desmosome
Plasmodesmata
3

Desmosomes provide strong adhesion between animal cells, anchoring them together (NCERT, Chapter 8, page 129). Gap junctions allow communication, tight junctions prevent leakage, and plasmodesmata are plant-specific.

Which part of the mitochondrion contains enzymes for the Krebs cycle?

Cristae
Outer membrane
Intermembrane space
Matrix
4

The mitochondrial matrix contains enzymes for the Krebs cycle (citric acid cycle) and other metabolic pathways.

Which of the following is NOT a function of the smooth endoplasmic reticulum?

Synthesis of lipids
Detoxification of drugs
Protein synthesis
Storage of calcium ions
3

Protein synthesis occurs in the rough ER, not the smooth ER, which is involved in lipid metabolism and detoxification.

Which type of chromosomes have the centromere slightly away from the middle, resulting in one shorter arm and one longer arm?

Metacentric
Sub-metacentric
Acrocentric
Telocentric
2

Sub-metacentric chromosomes have their centromere slightly away from the middle, resulting in one short and one long arm.

Which of the following is correct about peroxisomes?

Peroxisomes are involved in breaking down hydrogen peroxide.
Peroxisomes produce ATP.
Peroxisomes store genetic information.
Peroxisomes synthesize proteins.
1

Peroxisomes contain enzymes like catalase that break down hydrogen peroxide into water and oxygen, protecting the cell from oxidative damage.

Which of the following statements about chromatin is correct?

Chromatin is composed of DNA and histone proteins.
Chromatin is found only in prokaryotic cells.
Chromatin produces ATP for the cell.
Chromatin is involved in lipid synthesis.
1

Chromatin is a complex of DNA and histone proteins, which packages genetic material in the nucleus.

Which component of the plasma membrane facilitates active transport?

Phospholipids
Carrier proteins
Cholesterol
Glycoproteins
2

Carrier proteins facilitate active transport by moving molecules against their concentration gradient using energy (NCERT, Chapter 8, page 128). Phospholipids form the bilayer, cholesterol maintains fluidity, and glycoproteins aid in cell recognition.

Which structure in prokaryotic cells aids in respiration?

Nucleoid
Mesosome
Plasmid
Ribosome
2

Mesosomes are invaginations of the plasma membrane in prokaryotic cells that aid in respiration by increasing surface area for enzyme activity (NCERT, Chapter 8, page 130). Nucleoids store DNA, plasmids carry extra genes, and ribosomes synthesize proteins.

Which type of transport across the plasma membrane occurs without energy input?

Active transport
Facilitated diffusion
Endocytosis
Exocytosis
2

Facilitated diffusion allows molecules to move across the membrane via transport proteins without using energy, following their concentration gradient.

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