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outer, horny covering of insects, crustacea, and so forth
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...

(Science: cell biology) a cross linked polymer of N acetyl D glucosamine that is the major structural component of arthropod exoskeletons and fungal cell walls. Widely distributed in plants and fungi.

chitinous layer [Gr. chiton - an outer covering, tunic]. A thick, clear layer of an Ascaris egg shell which is composed of chitin and protein and provides a protective coating located between the fertilization membrane and the ascaroside layer.

Chitin Inhibitors
These substances, diflubenzuron (Dimilin«) is an example, interfere with the synthesis of chitin, the material that makes up the insect exoskeleton [see structure].

chitin A polysaccharide contained in fungi; also forms part of the hard outer covering of insects.
chlamydia A sexually transmitted disease caused by a parasitic bacterium that lives inside cells of the reproductive tract.

(ky-tin) [Gk. chiton, a tunic, undergarment]
A structural polysaccharide of an amino sugar found in many fungi and in the exoskeletons of all arthropods.
chlorophyll ...

chitin /KITE-in/ A structural polysaccharide that is the main component of the exoskeletons of all arthropods and the cell walls of fungi. It is also found in many mollusks, for example, in radulae and in the beaks of cephalopods.

Chitin - A major component of fungal cell walls that is not found in the cell walls of any other group. Compare with cellulose.

Chitin is similar to cellulose, but its sugar subunits are a modified form of glucose called N -acetyl glucosamine.

Chitin is similar to cellulose, except that it contains a nitrogen-containing appendage on each glucose monomer.
Pure chitin is leathery but can be hardened by the addition of calcium carbonate.

Chitin is also a homopolymer but is made of repeating subunits of N-acetyl-glucosamine, a derivative of glucose which has an amino group (containing nitrogen).

chitin 1.The polysaccharide found in the exoskeleton of arthropods.2. High molecular weight polymer of N-acetyl glucosamine linked by 1,4-b-glycosidic bonds.

a chitin layer (polymer consisting mainly of unbranched chains of N-acetyl-D-glucosamine)
a layer of ╬▓-1,3-glucan
a layer of mannoproteins (mannose-containing glycoproteins) which are heavily glycosylated at the outside of the cell.

Setules. Chitinous projections from copepod maxillipeds that trap food particles
Shelf-slope break. Line marking a change from the gently inclined continental shelf to the much steeper depth gradient of the continental slope ...

In fungi (chitin)
In plants (cellulose)
NOT in animals
Plasma membrane ...

Cellulose and Chitin are polysaccharides that function to support and protect the organism. The cell walls of plants are composed of cellulose. The cell walls of fungi and the exoskeleton of arthropods are composed of chitin.

Exoskeletons are hard outer shells made of chitin. While you have an endoskeleton, a crab has a tough shell that protects it from the outside world. Next on the list are the arms and legs. They have jointed appendages.

A hard exoskeleton, a strong but flexible outer covering composed primarily of the carbohydrate chitin. This functions in protection, attachment for muscles, locomotion, and prevention of desiccation.
Presence of jointed appendages.

Body expansion is restricted by the caterpillar's chitinous exoskeleton, in particular the inflexible head capsule, so postembryonic development is punctuated by a serious of molts, ...

They use a very unusual polysaccharide called chitin in their cell walls and this is one of the things that makes them distinct from several other groups. They follow the zygotic life cycle. What does that mean?

It's made up of chitin. All vibrios, including Vibrio cholerae, have a very powerful chitinase, an enzyme that breaks down that shell structure, so it plays a role in nature.

Crustacean: Any of a large class (Crustacea) of mostly aquatic mandibulate arthropods that have a chitinous or calcareous and chitinous exoskeleton, a pair of often modified appendages on each segment, and two pairs of antennae; includes lobsters, ...

Insects, being larger and having a hard, chitinous and therefore impermeable exoskeleton, have a more specialised gas exchange system.
Insects have no transport system so gases need to be transported directly to the respiring tissues.

Eucaryotic, chemoheterothropic microorganisms with cell walls containing chitin, cellulose or both. They may be unicelluar or multicellular. Often the terms yeast and mould are used to describe the morphological appearance of them.

Fungi generally have cell walls made from chitin and other materials. The hyphae may be modified to produce highly specialized cellular-scale structures.

Crustacean: Any of a zoological class (Crustacea) that have a chitinous and/or calcareous exoskeleton (lobsters, shrimps, crabs).

Sclerotin an insoluble tanned protein permeating and stiffening the chitin of the cuticle of arthropods ...

Oligosaccharides are found as common form of protein posttranslational modification. Polysaccharides represent an important class of biological polymer. Examples include starch, cellulose and chitin.
Nutrition ...

cell wall -- Rigid structure deposited outside the cell membrane. Plants are known for their cell walls of cellulose, as are the green algae and certain protists, while fungi have cell walls of chitin.

See also: See also: Organ, Animal, Plant, Animals, Cells

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