Question

Match the terms to these definitions.
Diffusion, osmosis, impermeable, differentially permeable, fluid mosaic model, micellar theory, endocytosis, exocytosis, passive transport, active transport, microvilli, desmosomes, chemoreception
..........Minute, finger-like - cytoplasmic processes, which increase the surace area of biomembranes for absorption

Answer 1

1. Diffusion is the movement of both gas and water molecules through the membrane from higher to lower concentration.
2. osmosis is the movement of water molecules against the concentration gradient through a semipermeable membrane.
3. Impermeable means it does not allow substances to pass through it.
4. Differentially impermeable is a selectively permeable membrane which does not permit the movement of solutes but completely permits the movement of solvents.
5. The fluid mosaic model is the modern model of the plasma membrane in which the proteins are embedded in the lipid bilayer.
6. The micellar theory states that the protoplasts and its contents are primary and micellar ( the unit structure made up of many ions and molecules ).
7. Endocytosis is a process of engulfing of food through the invagination of the membrane and forms a vacuole.
8. Exocytosis is a process in which food is exhaled by the cell through the plasma membrane.
9. Passive transport is a process of movement of ions and molecules across the membrane without the use of energy.
10. Active transport is a process of movement of ions and molecules across the membrane and requires the energy.
11. microvilli are the small, finger-like projections on the surface of membranes which increases the surface area and increases the rate of absorption.
    
12. Desmosomes are the structures that attach two adjacent cells together.
13. Chemoreception is a physiological process in which organisms respond to chemical stimulus.

So, the correct answer is 'Microvilli'.