Download CHE-120 Test 4

Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) A monosaccharide that contains 6 carbon atoms, one of which is in an aldehyde group, is classified
as a(n)
A) aldopentose.
B) ketotetrose.
C) ketopentose.
D) aldotetrose.
E) aldohexose.
1)
2) A double cheeseburger with bacon contains 39 g of fat. Calculate the number of kilocalories from
fat. (1 gram of fat = 9 kcal).
A) 350 kcal from fat
B) 39 kcal from fat
C) 4.3 kcal from fat
D) 71 kcal from fat
E) 640 kcal from fat
2)
3) To what main class of enzymes does the enzyme that catalyzes the following reaction belong?
3)
ser-ala → ser + ala
A) oxidoreductase
B) transferase
C) isomerase
D) hydrolase
E) lyase
4) A biological catalyst is called a(n) ________.
A) cofactor
B) lipid
C) substrate
4)
D) coenzyme
E) enzyme
5) Denaturation of a protein
A) changes the primary structure of a protein.
B) can only occur in a protein with quaternary structure.
C) is always irreversible.
D) hydrolyzes peptide bonds.
E) disrupts the secondary, tertiary, or quaternary structure of a protein.
5)
6) In any reaction catalyzed by an enzyme, the reacting molecule is called the
A) substrate.
B) allostere.
C) cofactor.
D) coenzyme.
E) isozyme.
6)
7) The side chain for histidine is classified as a ________ side chain.
A) acidic
B) polar
C) nonpolar
D) neutral
7)
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E) basic
8) The structural formulas of amino acids are the same EXCEPT for the
A) side (R) group.
B) alpha carbon.
C) carboxyl group.
D) hydrogen bonding.
E) amino group.
9) The names of many enzymes can be recognized by the suffix ________.
A) -ite
B) -ine
C) -ose
D) -ate
8)
9)
E) -ase
10) How many generalized steps are there in the reaction of an enzyme (E) with a substrate (S) to form
and release the product (P)?
A) one
B) two
C) three
D) four
E) five
10)
11) Which of the following lipids will give a single molecule of fatty acid when hydrolyzed?
A) petroleum
B) wax
C) steroid
D) fat
E) phospholipid
11)
12) Synthesis of cholesterol takes place in the
A) pancreas.
B) liver.
C) small intestine.
D) gall bladder.
E) large intestine.
12)
For the following question(s), identify the class of lipid to which each of the following molecules belongs.
13)
13)
A) wax
B) steroid
C) triacylglycerol
D) prostaglandin
E) glycerophospholipid
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14) A fatty acid salt can act as a soap to remove grease because
A) the salt molecules combine with grease and either Ca2+ or Mg 2+ to form a precipitate.
14)
B) the grease molecules form a thin layer around each salt molecule, making them soluble in
water.
C) the nonpolar tails of the salt cause the salt to float on the surface of the water.
D) the polar salt ends dissolve in the grease and the nonpolar tails cause the resulting micelles to
float on water.
E) the nonpolar tails of the salt dissolve in the grease and the polar salt ends dissolve in water.
15) Glycerophospholipids can interact both with other lipids and water because they contain
A) saturated fatty acids.
B) double bonds.
C) polar regions and nonpolar regions.
D) glycerol.
E) cholesterol.
15)
16) Margarine containing partially hydrogenated soybean oil is solid because
A) it contains only polyunsaturated fatty acids.
B) it contains only trans fatty acids.
C) it contains only saturated fats.
D) it contains only cis double bonds.
E) some of its double bonds have been converted to single bonds.
16)
Answer the following question(s) about the diagram shown below.
17) In this diagram of a cell membrane, the small branched object labeled (A) is part of a
A) hydrophobic region.
B) carbohydrate side chain.
C) membrane protein.
D) glycerophospholipid.
E) steroid.
17)
18) Fructose does not undergo hydrolysis because it is a
A) monosaccharide.
B) disaccharide.
C) hexose.
D) aldose.
E) reducing sugar.
18)
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19) A glycosidic bond between two monosaccharides can also be classified as a(n)
A) ether bond.
B) achiral bond.
C) alcohol bond.
D) double bond.
E) ester bond.
20) Which of the following contains a β-1,4-glycosidic bond?
A) amylose
B) galactose
C) maltose
21) Maltose can be classified as a(n)
A) polysaccharide.
B) disaccharide.
C) ketose.
D) pentose.
E) oligosaccharide.
19)
20)
D) sucrose
E) lactose
21)
Refer to the disaccharide below to answer the following question(s).
22) Hydrolysis of the disaccharide above gives the monosaccharides
A) fructose and lactose.
B) fructose and galactose.
C) ribose and glucose.
D) ribose and galactose.
E) fructose and ribose.
22)
23) Hyperglycemia is a condition in which
A) the glucose level in the liver is lower than normal.
B) the glucose level in the blood is about 100 mg/dL.
C) the glucose level in the pancreas is lower than normal.
D) the glucose level in the blood is higher than normal.
E) the amount of glucose in the urine is lower than normal.
23)
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24) Cellulose is not digestible by humans because it contains glucose units linked by
________-glycosidic bonds.
C) α-1,2
D) β-1,4
A) α-1,6
B) α-1,4
24)
E) β-1,2
Refer to the disaccharide below to answer the following question(s).
25) In the figure above, the monosaccharide unit on the left is a(n)
A) aldoheptose.
B) aldopentose.
C) ketopentose.
D) aldohexose.
E) ketohexose.
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25)
Answer Key
Testname: CHE‐120_TEST 4
1) E
ID: ichem10t 14.1-5
Diff: 0
2) A
ID: ichem10t 15.1-28
Diff: 0
3) D
ID: ichem10t 16.1-52
Diff: 0
4) E
ID: ichem10t 16.1-79
Diff: 0
5) E
ID: ichem10t 16.1-36
Diff: 0
6) A
ID: ichem10t 16.1-65
Diff: 0
7) E
ID: ichem10t 16.1-44
Diff: 0
8) A
ID: ichem10t 16.1-4
Diff: 0
9) E
ID: ichem10t 16.1-81
Diff: 0
10) B
ID: ichem10t 16.1-71
Diff: 0
11) B
ID: ichem10t 15.1-4
Diff: 0
12) B
ID: ichem10t 15.1-36
Diff: 0
13) B
ID: ichem10t 15.1-32
Diff: 0
14) E
ID: ichem10t 15.1-16
Diff: 0
15) C
ID: ichem10t 15.1-17
Diff: 0
16) E
ID: ichem10t 15.1-13
Diff: 0
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Answer Key
Testname: CHE‐120_TEST 4
17) B
ID: ichem10t 15.1-37
Diff: 0
18) A
ID: ichem10t 14.1-38
Diff: 0
19) A
ID: ichem10t 14.1-11
Diff: 0
20) E
ID: ichem10t 14.1-13
Diff: 0
21) B
ID: ichem10t 14.1-32
Diff: 0
22) B
ID: ichem10t 14.1-17
Diff: 0
23) D
ID: ichem10t 14.1-33
Diff: 0
24) D
ID: ichem10t 14.1-23
Diff: 0
25) E
ID: ichem10t 14.1-15
Diff: 0
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