Bioc2580 final F21 UPDATED ACTUAL
Exam Questions and CORRECT Answers
Which of the following acids is not a saturated fatty acid?
a) Lauric.
b) Myristic.
c) Palmitic.
d) Linoleic. - CORRECT ANSWER - D - Linoleic
Which of the following fatty acids is likely to have the lowest melting temperature?
a) CH3(CH2)18COOH.
b) CH3(CH2)20 COOH.
c)CH3(CH2)7CH=CH(CH2)7COH.
d)CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH - CORRECT ANSWER - D or the
longest chain
The complete hydrolysis of one mole of phosphatidylcholine yields the components glycerol,
fatty acid, phosphate, and choline, in which of the following respective molar ratios?
a) 2 :1:1:1 b) 1:2:1:1 c) 1:1:2:1 d) 1:2:1:2 - CORRECT ANSWER - B 1:2:1:1
In contrast to nucleic acids and polypeptides, many polysaccharides are highly branched. This is
a reflection of the fact that.....
a) monosaccharide building blocks themselves are branched.
b) monosaccharide building blocks have multiple anomeric carbon atoms.
c) monosaccharide building blocks have multiple -OH groups.
d) polysaccharides can be built from more than one type of monosaccharide building block.
e) unlike nucleic acids and polypeptides, polysaccharides are assembled by spontaneous
chemical processes, without requirement for enzymatic catalysis. - CORRECT ANSWER -
C) monosaccharides building blocks have multiple -OH groups
,Deoxyribose (the sugar in DNA) differs from ribose (the sugar in RNA) by the absence of the
hydroxyl group at position:
a) 1 b) 2 c) 3 d) 4 e) 5 - CORRECT ANSWER - b)2
Coenzyme A is....
a) a thiol.
b) derived from the vitamin pantothenic acid.
c) an adenosine-containing cofactor.
d) named for its role in acetylation reactions.
e) all of the above are correct. - CORRECT ANSWER - E) all the above
Consider that the following four compounds are completely oxidized to CO2.
(i) CH3-CH3
(ii) CH3CHO
(iii) CH3CH2OH
(iv) CH3COOH
The relative quantities of free energy released under standard conditions are:
a) (i)>(iii)>(ii)>(iv)
b) (iv)>(ii)>(iii)>(i)
c) (ii)>(iii)>(i)>(iv)
d) (iii)>(ii)>(i)>(iv) - CORRECT ANSWER - A) (i)>(iii)>(ii)>(iv)
Within the cell, ATP exists mainly as a complex with:
a) K+
b) Cationic proteins
c) Ca+2
d) Mg+2
e) Fe+3 - CORRECT ANSWER - d) MG+2
, Each of the following molecules (or classes of molecules) is transported across the inner
mitochondrial membrane of a eukaryotic cell by a specific protein carrier, except:
a) fatty acids.
b) pyruvate.
c) malate.
d) ATP.
e) NADH - CORRECT ANSWER - e) NADH
Which one of the following statements about redox reactions in biochemistry is false?
a) O2 is the strongest oxidant commonly encountered in biochemical processes.
b) Most biological oxidations involve reactions between an organic substrate and O2.
c) NADH is a stronger reducing agent than FADH2.
d) Reduction reactions in anabolic metabolic pathways usually use NADPH, not NADH. -
CORRECT ANSWER - b) Most biological oxidations involve reactions between an
organic substrate and O2.
Which of the following tissues must always be supplied with a supply of glucose?
a) brain and skeletal muscle.
b) erythrocytes and skeletal muscle.
c) brain and cardiac muscle.
d) brain and erythrocytes - CORRECT ANSWER - d) brain and erythrocytes
Acetyl CoA is supplied to the citric acid cycle by..
a) glycolysis (via pyruvate).
b) beta oxidation of fatty acids.
c) amino acid degradation.
d) all three of the above processes.
Exam Questions and CORRECT Answers
Which of the following acids is not a saturated fatty acid?
a) Lauric.
b) Myristic.
c) Palmitic.
d) Linoleic. - CORRECT ANSWER - D - Linoleic
Which of the following fatty acids is likely to have the lowest melting temperature?
a) CH3(CH2)18COOH.
b) CH3(CH2)20 COOH.
c)CH3(CH2)7CH=CH(CH2)7COH.
d)CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH - CORRECT ANSWER - D or the
longest chain
The complete hydrolysis of one mole of phosphatidylcholine yields the components glycerol,
fatty acid, phosphate, and choline, in which of the following respective molar ratios?
a) 2 :1:1:1 b) 1:2:1:1 c) 1:1:2:1 d) 1:2:1:2 - CORRECT ANSWER - B 1:2:1:1
In contrast to nucleic acids and polypeptides, many polysaccharides are highly branched. This is
a reflection of the fact that.....
a) monosaccharide building blocks themselves are branched.
b) monosaccharide building blocks have multiple anomeric carbon atoms.
c) monosaccharide building blocks have multiple -OH groups.
d) polysaccharides can be built from more than one type of monosaccharide building block.
e) unlike nucleic acids and polypeptides, polysaccharides are assembled by spontaneous
chemical processes, without requirement for enzymatic catalysis. - CORRECT ANSWER -
C) monosaccharides building blocks have multiple -OH groups
,Deoxyribose (the sugar in DNA) differs from ribose (the sugar in RNA) by the absence of the
hydroxyl group at position:
a) 1 b) 2 c) 3 d) 4 e) 5 - CORRECT ANSWER - b)2
Coenzyme A is....
a) a thiol.
b) derived from the vitamin pantothenic acid.
c) an adenosine-containing cofactor.
d) named for its role in acetylation reactions.
e) all of the above are correct. - CORRECT ANSWER - E) all the above
Consider that the following four compounds are completely oxidized to CO2.
(i) CH3-CH3
(ii) CH3CHO
(iii) CH3CH2OH
(iv) CH3COOH
The relative quantities of free energy released under standard conditions are:
a) (i)>(iii)>(ii)>(iv)
b) (iv)>(ii)>(iii)>(i)
c) (ii)>(iii)>(i)>(iv)
d) (iii)>(ii)>(i)>(iv) - CORRECT ANSWER - A) (i)>(iii)>(ii)>(iv)
Within the cell, ATP exists mainly as a complex with:
a) K+
b) Cationic proteins
c) Ca+2
d) Mg+2
e) Fe+3 - CORRECT ANSWER - d) MG+2
, Each of the following molecules (or classes of molecules) is transported across the inner
mitochondrial membrane of a eukaryotic cell by a specific protein carrier, except:
a) fatty acids.
b) pyruvate.
c) malate.
d) ATP.
e) NADH - CORRECT ANSWER - e) NADH
Which one of the following statements about redox reactions in biochemistry is false?
a) O2 is the strongest oxidant commonly encountered in biochemical processes.
b) Most biological oxidations involve reactions between an organic substrate and O2.
c) NADH is a stronger reducing agent than FADH2.
d) Reduction reactions in anabolic metabolic pathways usually use NADPH, not NADH. -
CORRECT ANSWER - b) Most biological oxidations involve reactions between an
organic substrate and O2.
Which of the following tissues must always be supplied with a supply of glucose?
a) brain and skeletal muscle.
b) erythrocytes and skeletal muscle.
c) brain and cardiac muscle.
d) brain and erythrocytes - CORRECT ANSWER - d) brain and erythrocytes
Acetyl CoA is supplied to the citric acid cycle by..
a) glycolysis (via pyruvate).
b) beta oxidation of fatty acids.
c) amino acid degradation.
d) all three of the above processes.
