BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The primary cilium is a unique organelle that plays an important role in transducing extracellular signals into the cytosol. Since skin is the outermost organ covering the body, it must be able to sense the extracellular environment, suggesting a role of primary cilia in it.

Detailed explanation-2: -Cilia are made up of microtubules coated by the plasma membrane. Each cilium comprises nine pairs of microtubules that form the outside ring and two central microtubules. This structure is called an axoneme. The nine outer pairs are made up of motor proteins called dynein.

Detailed explanation-3: -They play a vital role in cell locomotion and also act as a sensory organelle. They exhibit pendular stroking or sweeping movements in a coordinated fashion. Cilia are not present in prokaryotes. They are predominantly present in eukaryotes.

Detailed explanation-4: -Cilia are generally of two kinds: motile cilia (for locomotion) and non-motile cilia (for sensory). Example of tissue cells with cilia are the epithelia lining the lungs that sweep away fluids or particles. Examples of organisms that have cilia are protozoans that use them for movement.