Lecture 4

Question 1

Hemicellulseis composed of a number of different

Answer 1

Sugars

Question 2

Sugars in hemicellulose - 5 carbon

Answer 2

Xylose
Arabinose

Question 3

Sugars in hemicellulose - 6 carbon

Answer 3

Mannose
Galactose

Question 4

Hemicellulose composition varies by

Answer 4

Species and cell type

Question 5

Hemicellulose is primarily composed of

Answer 5

Xylose

Question 6

Second more dominant hemicellulose sugar

Answer 6

Arabinose

Question 7

Polymers of mostly xylose with less arabinose are referred to as

Answer 7

Arabinoxylans

Question 8

Is hemicellulose a repeating polymer

Answer 8

No. Bonds are variable

Question 9

Typical degree of polymerization of hemicellulose

Answer 9

100 sugar molecules

Question 10

Hemicellulose binds to cellulose by

Answer 10

Hydrogen bonds

Question 11

Hemicellulose helps link —- together

Answer 11

Cellulose fibrils

Question 12

Hemicellulose binds to - with covalent bonds

Answer 12

Lignin

Question 13

Lignin

Answer 13

Amorphous tangle of phenolics (like ferulic acid)

Question 14

What happens when a fungal glucuronoyl esterase is turned on in plants

Answer 14

Cell wall chemistry and structure of the plant were altered

Question 15

Do we have knowledge of enzymes involved in hemicellulose synthesis

Answer 15

Not much

Question 16

What is involved with hemicellulose assembly

Answer 16

Syntheses and transferases

Question 17

Where does assembly of hemicellulose begin

Answer 17

Golgi

Question 18

How are contents of the golgi released

Answer 18

Golgi forms vesicles which fuse with the plasma membrane and release the contents to the cell wall

Question 19

What can xylose be converted to

Answer 19

Xylitol (artificial sweetener)

Question 20

What bio resource can be made by hemicellulose

Answer 20

Bio plastics