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Tymoczko, Biochemistry: A Short Course 3e, Launchpad - Chapter 10: Practice Quiz
9/14/16, 10:32 PM
1. D-Glucose and L-glucose are
a. diastereoisomers.
b. enantiomers.
c. epimers.
d. anomers
2. Complete the statement: The furanose form of fructose is generated by formation of a hemiketal involving
the attack of the hydroxyl group on carbon _____ with carbon _____.
a. 5; 2
b. 2; 6
c. 6; 1
d. 6; 2
3. Formation of pyranose and furanose forms of sugar result in the generation of a new asymmetric carbon
giving rise to α- and β-forms of the sugars. If the resulting anomeric alcohol group is above the plane of the
sugar, the structure is known as
a. the α-anomer.
b. the epimeric position.
c. the β-anomer.
d. the enantiomer.
4. Once formed, the α- and β-forms of D-glucose are
a. not capable of interconversion.
b. interconvertible directly with no intermediate and are in equilibrium with one another.
c. interconvertible only through a linear, noncyclic intermediate with which they are both in equilibrium.
d. found in an equal ratio.
5. Glucose yields a positive test with cupric ions such as those of Fehling's solution but sucrose does not
because
a. glucose is a monomer while sucrose is a dimer.
b. glucose is an aldose, while sucrose is a dimer of an aldose and a ketose.
c. glucose is in equilibrium with its free aldehyde form, (is a reducing sugar) while sucrose is not.
d. sucrose contains a five-sided ring structure molecule necessary for reaction with cupric ions.
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Tymoczko, Biochemistry: A Short Course 3e, Launchpad - Chapter 10: Practice Quiz
9/14/16, 10:32 PM
6. Advanced glycation end products are
a. products of reactions between reducing sugars and free amino groups.
b. two or more sugars joined together in a covalent bond.
c. products of a reaction between sucrose and proteins.
d. solely composed of long carbohydrate polymers on free amino groups.
7. Human blood groups (ABO) are
a. the result of the same oligosaccharides being attached to different proteins.
b. the result of differing glycosyltransferases.
c. the result of differing amylases.
d. the result of different amino acid sequences found on a protein in the red blood cell membrane.
8. Glycoproteins are proteins to which carbohydrates have been covalently attached. The amino acid R groups
that serve as the sites for such attachment include
a. negatively charged amino acid R-groups.
b. cysteine.
c. hydroxyl-containing R-groups.
d. positively charged amino acid R-groups.
9. If a pair of molecules could be related to each other as one of the following isomers, which pair would allow
one member to interconvert to the other member and not require an enzyme to do it?
a. enantiomer
b. diastereoisomer
c. epimer
d. anomer
10. Which of the following molecules contain multiple O-glycosidic linkage types?
a. glycogen
b. amylose
c. cellulose
d. sucrose
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Tymoczko, Biochemistry: A Short Course 3e, Launchpad - Chapter 11: Practice Quiz
10/11/16, 8:29 PM
1. Lipid molecules are said to be amphipathic, meaning that
a. they have asymmetric carbons and can exist in left- and right-handed forms.
b. they have a dual nature with part of the molecule being hydrophobic and the other part hydrophilic.
c. they are capable of moving rapidly from one side of a lipid bilayer to the other.
d. they carry a positive charge on one end and a negative charge on the other end.
2. Unsaturated fatty acids have double bonds that are in the cis, rather than the trans, configuration. One of the
consequences of this is
a. an alteration in the charge of the molecule.
b. an alteration in the number of carbons in the molecule.
c. a bend in the molecule.
d. an enhanced flexibility of the molecule.
3. In phosphoglycerides, fatty acids are esterified at
a. glycerol carbons 1 and 2.
b. glycerol carbons 1 and 3.
c. any two of the three glycerol.
d. a glycerol carbon and the phosphate group.
4. Which of the following is NOT a difference of archaeal membrane lipids relative to those of other
organisms?
a. A backbone other than glycerol is used.
b. Fatty acid esters are replaced with long chain alcohol esters to the glycerol.
c. The long hydrophobic tails are branched rather than being linear.
d. Ether linkages instead of ester linkages are used.
5. Of the three major types of membrane lipids, which is NOT found in prokaryotes?
a. phospholipids
b. glycolipids
c. cholesterol
d. phosphoglycerides
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Tymoczko, Biochemistry: A Short Course 3e, Launchpad - Chapter 11: Practice Quiz
10/11/16, 8:29 PM
6. The fatty acid oleate contains 18 carbons and a cis double-bound after carbon number nine. Which of the
following would be a correct designation for this molecule?
a. 18:9
b. 9:18
c. 18:1
d. 0:18
7. Fatty acids in biological systems usually contain an even number of carbon atoms. Which of the following
are the MOST common?
a. fatty acids with 16 and 18 carbons
b. fatty acids with 18 and 20 carbons
c. fatty acids with 14 and 16 carbons
d. fatty acids with 12 and 14 carbons
8. Triacylglycerol consists of fatty acids attached to:
a. three cholesterols.
b. one glycerol phosphate.
c. two glycerol phosphates.
d. one glycerol.
9. The three major kinds of membrane lipids are:
a. phospholipids, fatty acids, and glycolipids.
b. phospholipids, fatty acids, and cholesterol.
c. phosphatidylinositol, phosphatidylcholine, and phosphatidylethanolamine.
d. phospholipids, glycolipids, and cholesterol.
10. What is the MOST common steroid?
a. cholesterol
b. testosterone
c. estradiol
d. NADPH
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