This set of Cell Biology Multiple Choice Questions & Answers (MCQs) focuses on “Cell Interactions – Cells with Other Cells”.
1. Which of the following is used by cells to interact with other cells?
a) Cell junctions
b) Cell adhesions
c) Cell detectors
d) Cell tubules
Explanation: Cell junctions are used by cells to interact with each other in certain tissues. These are stable interactions made for the development and function of the cell.
2. What is the name of the interaction made by the immune system?
Explanation: The transient or otherwise known as temporary interactions are the cell-cell interaction done by the immune system. These are done when there is an inflammatory reaction.
3. Cell junction is abundant in __________
a) Hepatic cells
b) Cardiac cells
c) Epithelial cells
d) Prokaryotic cells
Explanation: The cell junction is abundant in epithelial cells, which provide barrier and control over the transport in the cell. It is otherwise known as intercellular bridge, which is made up of multiprotein complexes.
4. What is the function of tight junctions in epithelial cells?
a) Separation of fluids
b) Biocatalyst to enzymes
d) Support and structure
Explanation: The tight junction is made up of multi-protein complexes, which helps in regulating the transport mechanism. In epithelial cells, the tight junction is useful in separating the extracellular fluids.
5. Tight junctions are made up of single junctions in our body.
Explanation: Tight junctions are made up of four different protein complexes namely occludin, claudin, junctional adhesional molecule and tricellulins. These molecules being heterophilic in nature, they help in regulating the transport.
6. Which of the following is the continuous channel formed by the cell membranes?
c) Annular Shell
Explanation: Annular lipid shells are complex formed by lipid molecules and membrane protein forming a continuous channel for transfer for cellular molecules across different cells. These transmembrane channels are useful in importing/exporting lipids across the membrane.
7. What do you mean by leukocyte extravasation?
a) Movement of leukocytes to tissues
b) Movement of leukocytes to blood
c) Lysis of leukocytes
d) Formation of leukocytes
Explanation: Leukocytes travel to tissues from circulation by moving past the cellular junctions. This process is known as extravasation and it occurs by interaction of cellular selectins and integrins.
8. Which of the following is a signaling molecule for bacteria?
a) Heteroserine lactones
b) Polyserine lactones
c) Monoserine lactones
d) Homoserine lactones
Explanation: Homoserine lactones are the signaling molecules a bacteria uses in cell-cell interactions. These help in their growth and metabolism.
9. Bacteria uses glycoproteins and glycolipids to attach itself to the host cell.
Explanation: Bacterial cell wall contains glycoproteins and glycolipids to anchor itself to the cell wall. These bacteria release some toxins and disintegrates the cell wall.
10. Which of the following is the result of platelet interaction?
a) Tearing of cells
c) Antigen response
Explanation: Coagulation happens when the blood platelets interact with the damaged tissue. It releases a chemical signal for the other platelets to do the process of coagulation.
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