Which one of the following permits the rapid diffusion of small, water-soluble molecules between the cytoplasm of adjacent cells? (1) Tight junctions (2) Anchoring junctions (3) Adherens junctions (4) Gap […]
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Cell-Cell Communication
Cell Junctions in Animals: Functions and Types Explained
26. Physical attachment between cells and extracellular matrix is critical in both animals and plants because it imparts rigidity and strength to tissues and organs. However, junctions between cell-cell or […]
Cell-Cell Communication
Understanding Vertebrate Epithelial Cell Junctions and Their Functions
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 […]
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 […]
