Biochemistry Cumulative II
Terms in this set (21)
Identify the anomeric form of the below molecule
A. alpha- form
C. A and B
What is the type of ring structure is the below molecule?
Consider the configuration of most hexoses and amino acids found in living organisms. Which of the following statements is correct?
A. Most hexoses and amino acids are found as L-isomers in living organisms.
B. Most hexoses are found as D-isomers in living organisms, whereas most amino acids are found as L-isomers in living organisms.
C. Most hexoses and amino acids are found as D-isomers in living organisms.
D. Most hexoses are found as L-isomers in living organisms, whereas most amino acids are found as D-isomers in living organisms.
How many stereoisomers does D-ribose, an aldopentose, have?
Which of the following statements is true regarding the structures shown below?
A. Both structures are examples of aldoses.
B. Both structures are examples of ketoses.
C. One structure is an example of an aldose and other a ketose.
D. One has a chiral carbon center and other does not.
E. both C and D
Which of the following statements is FALSE of the structures shown below?
A. They are anomers.
B. They are enantiomers
C. They are stereoisomers.
D. They are differing in configuration at anomeric carbon
What statement of FALSE for lactose, its abbreviated name is Gal(β1→4)Glc.
A. C-1 of Galactose(Gal) is attached to C-4 of glucose (Glc) via glycosidic bond
B. Anomeric carbon of Glucose (Glu) is bond to non-anomeric carbon of Galactose(Gal) via glycosidic bond
C. The anomeric carbon of Galactose is in β form
D. Anomeric carbon of Galactose (Gal) is bond to non-anomeric carbon of Glucose(Glc) via glycosidic bond
All of the following are homopolysaccharides EXCEPT for:
Which of the following polymers plays a structural role in insects, spiders, and crustaceans, giving rigidity and strength to exoskeletons?
What is the benefit of branching in storage polysaccharides?
A. It allows tighter packaging of the polysaccharide.
B. It creates more ends for rapid glucose access during energy needs
C. It forces the glycosidic linkages to be all α-conformation.
D. None of these are actual benefits.
Which of the following statements is true regarding glycogen and starch?
A. Both are polymers of subunits of glucose(α1→4)-linked, with (α1→6)-linked branches.
B. Both are branched homopolysaccharides
C. Glycogen is a form of energy storage in plants, whereas starch is an energy storage form in animals.
D. A and B
What statement below is FALSE regarding glycosaminoglycans?
A. They long unbranched heteropolysaccharides consisting of a repeating disaccharide unit
B. One saccharide unit is N-acetylglucosamine or N-acetylgalactosamine in glycosamineglycans.
C. Another unit is negatively charged saccharide in glycosamineglycans.
D. An example of glycosamineglycan include chitin
Due to the negatively charged nature of glycosaminoglycans, they
A. have extended structure
B. are highly hydrated and function in lubrication of joints
C. negative charge is due to carboxyl (COO-) or sulfate functional groups on sugar.
D. All the above
The monomer of chitin is:
A. N-acetyl glucosamine
B. N-acetyl galactosamine
D. both A and C
Which statement is FALSE regarding glycoproteins?
A. They can be either O-linked or N-linked glycoproteins
B. O-linked glycoproteins result from linkage of saccharides at Serine residue and N-linked glycoprotein result from linkage at Asparagine (Asn) residue in proteins
C. They contain diverse sugar molecules and function in cell-cell signaling
D. They mostly constitute of carbohydrates than proteins i.e more percentage of carbohydrate than proteins.
Preoteoglycans are made of core protein(s) attached to _____________
B. diverse and several monosaccharides (other than glycosaminoglycans)
C. only glucose
D. Both A and B
A and B
Heparin is a highly negatively charged glycosaminoglycan that act as an ________.
B. lubricant in joints
C. storage carbohydrate
D. structural carbohydrate
In polysaccharides, the monomeric sugars are attached via ____________________ bonds
The glycosidic bond in disaccharides always occurs between two anomeric carbons.
What is the most common monosaccharide?
The glycosidic linkage in cellulose is ____________, which is acted upon enzyme called cellulase.
C. β (1à6)