Physical attachment between cells important in imparting strength in tissues. Various physical cell junctions in vertebrate epithelial tissues are classified according to their primary functions. Enlisted below in column A […]
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Cell-Cell Communication
Hyaluronan: The Unique Glycosaminoglycan Not Forming Proteoglycans
24. Which one of the following glycosaminoglycans is generally NOT covalently attached to protein as proteoglycans? (1) Chondroitin sulphate (2) Dermatan sulphate (3) Heparan sulphate (4) Hyaluronan Overview: Glycosaminoglycans and […]
Cell-Cell Communication
Hyaluron: A Glycosaminoglycan but Not a Proteoglycan – Key Differences Explained
Glycosaminoglycans are usually linked to proteins to form proteoglycans. Which of the following is NOT a proteo-glycan? (1) Hyaluron (2) Aggrecan (3) Betaglycan (4) Syndecan-l The correct answer is (1) […]
Cell-Cell Communication
Desmosomes: Key Intercellular Junctions in Animal Cells
Which one of the following is a type of intercellular junction in animal cells? (1) Middle lamella (2) Plasmodesmata (3) Desmosomes (4) Glycocalyx The correct answer is (3) Desmosomes, which […]
Cell-Cell Communication
Connexin: The Building Block of Gap Junction Channels
The cylindrical channels in gap junctions are made of (1) connexin. (2) collagen. (3) fibronectin. (4) N-CAM. The cylindrical channels in gap junctions are made of (1) connexin. Connexins are […]
Cell-Cell Communication
Why Keratin Is Not an Extracellular Matrix Protein: ECM Protein Functions Explained
20. Which one of the following is NOT an extracellular matrix protein? (1) Keratin (2) Laminin (3) Collagen (4) Vitronectin The correct answer is (1) Keratin, which is NOT […]
Cell-Cell Communication
Which Is Not an Extracellular Matrix Protein? Cyclin vs. Fibronectin, Vitronectin, and Laminin
Which one of the following is NOT an extracellular matrix protein? (1) Fibronectin (2) Vitronectin (3) Laminin (4) Cyclin The correct answer is (4) Cyclin, which is NOT an extracellular […]
Cell-Cell Communication
Cadherin: The Key Molecule in Calcium-Dependent Cell-Cell Adhesion
18. Which of the following molecules is involved in Ca2+ – dependent cell-cell adhesion? (1) Calmodulin (2) Cadherin (3) N-CAM (4) Calpain The molecule involved in Ca2+-dependent cell-cell adhesion […]
Cell-Cell Communication
Integrin Binding Partners: Linking ECM Macromolecules to the Cytoskeleton
Integrin molecule link extracellular matrix (ECM) to the actin cytoskeleton of cell. Integrin binds to which of the following ECM macromolecules? (1) Laminin (2) Collagen (3) Fibronectin (4) Vitronectin Integrins […]
Cell-Cell Communication
What Is an Intracellular Anchor Protein? Vinculin’s Essential Role in Cell Adhesion
Which of the following is an intracellular anchor protein? (1) Vitronectin (2) Integrin (3) Vinculin (4) Elastin The correct answer is (3) Vinculin, which is an intracellular anchor protein. Vinculin […]
