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Chitin: Quiz


Question 1: Chitin is a modified ________ which contains nitrogen; it is synthesized from units of N-acetylglucosamine (more correctly, 2-(Acetylamino)-2-deoxy-D-glucose).

Question 2: [6] ________ is derived from chitin, which is used as a biocontrol elicitor in agriculture and horticulture.

Question 3: In its pure form it is leathery, but when encrusted in ________ it becomes much harder.
Calcium oxideCalcium carbonateCalcium silicateCalcium hydroxide

Question 4: The oldest preserved chitin dates to the ________, about 25 million years ago.
EoceneOligoceneGeologic time scalePaleocene

Question 5: These words were derived from the Greek word "chit┼Źn", meaning ________.

Question 6: This allows for increased ________ between adjacent polymers, giving the chitin-polymer matrix increased strength.
Chemical polarityDipolar bondHydrogen bondChemical bond

Question 7: Although keratin is a protein, and not a ________ like chitin, keratin and chitin have similar structural functions.

Question 8: A similar word, "________", refers to a marine animal with a protective shell (also known as a "sea cradle").
MolluscaChitonChitonidaTusk shell

Question 9: crabs, lobsters and shrimps) and insects, the radulas of mollusks and the beaks of ________, including squid and octopuses.

Question 10: In ________, however, it is often modified, becoming embedded in a hardened proteinaceous matrix, which forms much of the exoskeleton.

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