The major route for endocytosis in most cells, and the best-understood, is that mediated by the molecule clathrin. This large protein assists in the formation of a coated pit on the inner surface of the plasma membrane of the cell.This pit then buds into the cell to form a coated vesicle in the cytoplasm of the cell.he major route for endocytosis in most cells, and the best-understood, is that mediated by the molecule clathrin. This large protein assists in the formation of a coated pit on the inner surface of the plasma membrane of the cell.
Sponges are extremely primitive invertebrate life so are classed under the Kingdom Animalia, they do not photosynthesise so are not plants. They are also very different to fungi and have an entirely different composition and life cycle. A sponge if passed through a sieve gradually reforms its original shape.ponges are extremely primitive invertebrate life so are classed under the Kingdom Animalia, they do not photosynthesise so are not plants. They are also very different to fungi and have an entirely different composition and life cycle. A sponge if passed through a sieve gradually reforms its original shape.
The second dish turned out to contain a sponge (phylum: Porifera), an animal that looks like the antithesis of an animal. Sponges sit immobile, anchored to rock or rooted in sediment, filtering particles from water. There are around eighty-five hundred known species, and they live in both oceans and freshwater. Sponges exist in a rainbow of hues and can, in the case of the Caribbean giant barrel sponge, grow up to eight feet in diameter. All of them share the same basic body plan: a measly two layers of cells, enveloping a jelly-like filling. They lack digestive systems and circulatory systems.