EGEE 439 Exam 2 UPDATED Exam Questions and CORRECT Answers

EGEE 439 Exam 2 UPDATED Exam
Questions and CORRECT Answers
Carbohydrates - CORRECT ANSWER - the sugars and complex units composed of sugar
(saccharides)


Monosaccharides - CORRECT ANSWER - molecule that is in a ring structure with carbons
and oxygen (Glucose, Galactose, Fructose)


Disaccharides - CORRECT ANSWER - dimers of the monomers (Sucrose [glucose
+fructose], lactose [glucose + galactose], maltose [glucose + glucose])


Carbohydrates are connected with ____ bond - CORRECT ANSWER - Glycosidic



Polysaccharides - CORRECT ANSWER - Glycogen, starch, and cellulose



Glycogen - CORRECT ANSWER - Molecule in which animals store glucose by polymerizing
glucose


Starch is made up of 2 components - CORRECT ANSWER - 1. Amylose
2. Amylopectin


Amylose - CORRECT ANSWER - 1. linear straight chain
2. alpha 1,4- glycosidic bond linkage
3. larger scale, helical shape
4. MW: 10k-50k amu
4. glucose units: 6-300


Amylopectin - CORRECT ANSWER - 1. branched chains

, 2. alpha 1,4 & 1,6-glycosidic bond linkage
3. 10x the size of amylose
4. MW: 300k amu
5. glucose units: 1800


Cellulose - CORRECT ANSWER - 1. Most abundant polysaccaride and biomass on Earth
2. beta-1,4-linkage
3. H-bond to make it strong and linear (not helical)
4. long fibers
5. MW: 50-500k amu
6. glucose units: 300-2500


Hemicellulose - CORRECT ANSWER - Heteropolymer: Random amorphous structure, with
randomized repeating units


Monomers of Hemicellulose - CORRECT ANSWER - Xlyose, Mannose, Galactose,
Rhamnose, Arabinose


Polymers of Hemicellulose - CORRECT ANSWER - Xylan, Glucuronxylan, Arabinoxylan,
Glucomannan, Xyloglucan


Lignin - CORRECT ANSWER - 1. Helps to keep water from permeating cell wall
2. strengthens & supports
3. protects from fungi/bacteria/pathogens


What is lignin comprised of? - CORRECT ANSWER - 1. p-coumaryl alcohol
2. coniferal alcohol
3. synapyl alcohol