4 public questions tagged with this topic.
Ciliary movement is seen in ciliated epithelial cells, such as those in the respiratory tract, which help move mucus and trapped particles.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Types of Movement - Amoeboid Ciliary Flagellar Muscular
Cilia and flagella share fundamentally identical internal architecture termed axoneme composed of nine peripheral microtubule doublets surrounding two central singlets, 9+2 arrangement, radial spokes, and dynein motor arms producing bending via ATP hydrolysis and basal body anchoring. Ultrastructurally and proteomically they are synonymous organelles using tubulin and intraflagellar transport. Distinction rests on length, quantity, and waveform: flagella typically longer, fewer, propelling with undulating waves, while cilia are shorter, numerous, beating coordinately in metachronal waves to move fluids or cells, not internal microtubule composition.
Ref: Campbell Biology 11th ed., Chapter 6 Cilia flagella length number waveform same ultrastructure; Cooper Cell Biology 9+2 axoneme
Amoeboid locomotion relies on dynamic remodeling of actin cytoskeleton producing cytoplasmic extensions termed pseudopodia meaning false feet. Through polymerization of G-actin at leading edge forming lamellipodia and depolymerization at rear, cytoplasm streams inside projection, adhesion complexes anchor to substratum via transmembrane proteins, propelling cell forward. Small GTPases Rac and Cdc42 regulate branching. Forms include lobopodia in Amoeba, filopodia in foraminifera, and reticulopodia in radiolarians. This crawling mechanism also mediates phagocytic capture of bacteria, distinguishing amoeboid motility from swimming via cilia or flagella requiring microtubules.
Ref: Alberts Molecular Biology Cell amoeboid locomotion pseudopodia actin; Campbell Biology 11th ed., Chapter 28 Protist motility pseudopods organization
Matrix metalloproteinases, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.
Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)
