BIOCHEM C785 MIDTERM 2 ACTUAL
QUESTIONS AND CORRECT ANSWERS
◉ Which Sugar is NOT chiral.
Answer: Ketotriose
◉ D-gylceraldehyde.
Answer:
◉ D-Ribose.
Answer:
◉ D-deoxyribose.
Answer:
◉ D-glucose.
Answer:
◉ D-galactose.
Answer:
,◉ D-Ribulose.
Answer:
◉ D-Fructose.
Answer:
◉ Anomeric carbon.
Answer: only carbon attached to two oxygens
-OH may point up or down
◉ Puranose vs Furanose.
Answer: Six membered ring vs Five membered ring
Puranoses = hemiacetals
Furanoses = hemiketals
Only cyclic molecules that are stable in solution due to ring strain.
◉ Glycans.
Answer: another name for polysaccharides
◉ Homopolysaccharide vs Heteropolysaccharide.
,Answer: • Homopolysaccharide - a polysaccharide that contains only
one kind of monosaccharide
• Heteropolysaccharide - a polysaccharide made of several
monosaccharides
◉ Startch.
Answer: Storage polysaccharide of plants (potatoes, rice, etc)
Made of amylose and amylopectin
◉ Amylose and Amylopectin.
Answer: Amylose: UNBRANCHED polymer of D-glucose with alpha
1,4 link
Amylopectin: BRANCHED polymer of D-glucose with alpha 1,4 link
and alpha 1,6 link
◉ Cellulose.
Answer: Polysaccharide consisting of glucose monomers that
reinforces plant-cell walls
Beta 1-4 linkages with no branches - fiberous
, Like starch but linked different
◉ What is glycogen and starch broken by and where.
Answer: Alpha amylase and glycosidases at the alpha 1-4 link (NOT
the branched parts)
◉ How do termites break down cellulose.
Answer: Have the protist trichonympha living in them that secrete
cellulase to break down cellulose
◉ Chitin.
Answer: A structural polysaccharide, consisting of amino sugar
monomers, found in many fungal cell walls and in the exoskeletons
of all arthropods.
N-acetylglucoamine in beta 1,4 links
Like cellulose with C2 OH replaced with amine group
◉ Peptidoglycan.
Answer: A protein-carbohydrate compound that makes the cell walls
of bacteria rigid
QUESTIONS AND CORRECT ANSWERS
◉ Which Sugar is NOT chiral.
Answer: Ketotriose
◉ D-gylceraldehyde.
Answer:
◉ D-Ribose.
Answer:
◉ D-deoxyribose.
Answer:
◉ D-glucose.
Answer:
◉ D-galactose.
Answer:
,◉ D-Ribulose.
Answer:
◉ D-Fructose.
Answer:
◉ Anomeric carbon.
Answer: only carbon attached to two oxygens
-OH may point up or down
◉ Puranose vs Furanose.
Answer: Six membered ring vs Five membered ring
Puranoses = hemiacetals
Furanoses = hemiketals
Only cyclic molecules that are stable in solution due to ring strain.
◉ Glycans.
Answer: another name for polysaccharides
◉ Homopolysaccharide vs Heteropolysaccharide.
,Answer: • Homopolysaccharide - a polysaccharide that contains only
one kind of monosaccharide
• Heteropolysaccharide - a polysaccharide made of several
monosaccharides
◉ Startch.
Answer: Storage polysaccharide of plants (potatoes, rice, etc)
Made of amylose and amylopectin
◉ Amylose and Amylopectin.
Answer: Amylose: UNBRANCHED polymer of D-glucose with alpha
1,4 link
Amylopectin: BRANCHED polymer of D-glucose with alpha 1,4 link
and alpha 1,6 link
◉ Cellulose.
Answer: Polysaccharide consisting of glucose monomers that
reinforces plant-cell walls
Beta 1-4 linkages with no branches - fiberous
, Like starch but linked different
◉ What is glycogen and starch broken by and where.
Answer: Alpha amylase and glycosidases at the alpha 1-4 link (NOT
the branched parts)
◉ How do termites break down cellulose.
Answer: Have the protist trichonympha living in them that secrete
cellulase to break down cellulose
◉ Chitin.
Answer: A structural polysaccharide, consisting of amino sugar
monomers, found in many fungal cell walls and in the exoskeletons
of all arthropods.
N-acetylglucoamine in beta 1,4 links
Like cellulose with C2 OH replaced with amine group
◉ Peptidoglycan.
Answer: A protein-carbohydrate compound that makes the cell walls
of bacteria rigid
