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3.1 Cell Adhesion Molecules — Test 1
Q1. Which of the following is a cell adhesion molecule?✓ Integrin
Q2. Integrins are:✓ Cell adhesion molecules
Q3. Cadherins are a family of cell adhesion molecules dependent on:✓ Ca²⁺
Q4. The glycoproteins that mediate Ca²⁺-dependent cell–cell adhesion and transmit signals from the extracellular matrix to the cytoplasm are:✓ Cadherin
Q5. The classical cadherins are linked to the actin cytoskeleton by intracellular proteins called:✓ Catenins
Q6. Many integrins recognize which short peptide motif in their ligands?✓ The RGD motif
Q7. Which one of the following is NOT a cell adhesion protein?✓ Laminin
Q8. Selectins are:✓ Cell-surface lectins that mediate transient cell–cell adhesion in the bloodstream
3.2 Cell Junctions — Test 2
Q9. Which one of the following is a type of intercellular junction in animal cells?✓ Desmosomes
Q10. The anchoring junction that links the intermediate filaments of two adjoining cells is the:✓ Desmosome
Q11. Which component of a cell–cell junction is responsible for the flow of small molecules between cells?✓ Connexins
Q12. The cylindrical channels in gap junctions are made of:✓ Connexin
Q13. Which junction permits the rapid diffusion of small, water-soluble molecules between the cytoplasm of adjacent cells?✓ Gap junctions
Q14. Tight junctions are composed of all the following proteins EXCEPT:✓ Cadherins
Q15. The primary function of desmosomes is to:✓ Provide structural support and mechanical strength by anchoring adjacent cells
Q16. In plants, the function of plasmodesmata is most similar to that of which animal-cell junction?✓ Gap junctions
Q17. Junctions that tether cytoskeletal filaments inside the cell are known as:✓ Anchoring junctions
Q18. Gap junctions are absent in:✓ Skeletal muscle