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CHEM 125
Test 4-A
Leonard
Spring 2004
Name:
PID:
Multiple Choice (60 pts total; 3 pts. each). Choose the correct answer for each of the following
questions. Write the letter clearly in the blank next to the number.
1.
Green plants are capable of synthesizing _________ from carbon dioxide and
water through the process known as photosynthesis
a. carbohydrates
2.
c.
lipids
d. chlorophyll
Which of the molecules below is a Fisher projection of L-Frucose?
a.
b.
H
C O
H C H
HO C OH
H C OH
CH2OH
_____3.
b. proteins
c.
H
HO
H
HO
H
C O
C OH
C H
C OH
C H
CH2OH
d.
CH2OH
C O
HO C H
H C OH
HO C H
CH2OH
H
C O
HO C H
CH2OH
Carbohydrates, lipids, and proteins are all converted into ____________ before
entering the Krebs cycle.
a. acetone
b. pyruvate
c.
ATP
d. acetyl CoA
4.
Mutorotation is known as the process by which:
a.
b.
c.
d.
a normal gene is converted into a superhero gene
an -glycosidic linkage is converted into a -glycosidic linkage
a D ( alpha) sugar is converted into an L (beta) sugar
a monosaccharide is converted into a disaccharide
5.
The disaccharide sucrose is made up of which of the following monosaccharides:
a.
b.
c.
d.
a glucose and a fructose
two glucose units
a maltose and a mannose
a galactose and a ribose
6.
Cellulose is ______________, and it is primarily used as structural material in
___________.
a.
b.
c.
d.
a fat, animal cells
a polysaccaride, plant cells
a protein, a plant cells
a carbohydrate, animal cells
7.
The term “table sugar” refers to which of the following sugars?
a.
b.
c.
d.
fructose
lactose
mannose
sucrose
8.
A triglyceride is most commonly made from:
a.
b.
c.
d.
three amino acids and a peptide backbone
three sphingosine units with a fatty acid backbone
three fatty acids and a glycerol backbone
three nucleotide units and a sugar backbone
______9.
Which of the following classifications for the lipid molecule drawn below is
correct ?
O
H2C
O C
HC
O
H2C
O
O
(CH2)16CH3
O
OH
CH2OH
OH
OH
P O CH2CH2N+(CH3)3
O-
I-Phospholipid
II.-Glycolipid
III-Sphingolipid
a.
b.
c.
d.
I and II
II and III
I, II, and III
I only
______10.
During the Stage I of the metabolism, which of the following nutrient derivatives
does NOT pass through the small intenstinal lining to enter Stage II?
a.
b.
c.
d.
amino acids
fatty acids
simple sugars
peptides
11.
Which statement correctly represents the utility of bile salts:
a.
to prevent calcium deposits in the gall bladder and liver, removing the risk of
stones
to denature complicated protein chains, making them easier to hydrolyze
to break up large fat globules into smaller fat globules, making fats effectively
water soluble
to catalyze the hydrolysis of polysaccharides into monosaccharides
b.
c.
d.
______12.
The process by which amino acids can be separated based upon their isoelectric
pH is called:
a.
b.
c.
d.
zwittierionization
electrophoresis
denaturation
mutorotation
13.
What degree of structure of the protein is changed when an individual’s hair is
given a permanent wave (“perm”)?
a.
b.
c.
d.
1o structural element
2o structural element
3o structural element
4o structural element
(OMIT)______14.
a.
b.
c.
d.
(OMIT)15/.
Enzymes are complex organic molecules which act upon _____________.
vitamins
products
cofactors
substrates
Which mRNA strands will correctly code for the following peptide chain?
Trp-Lys-Ser-Ile-Leu
a.
5’CUGAUUUCCAAGUGG3’
b.
5’UGGAAGUCCAUUCUG3’
c.
5’GUCUUACCUGAAGGU3’
d.
5’UGAAGAUUCAUACGU3’
_(OMIT)_16. Enzymes present in gastric juices, which specializes in catalyzing the hydrolysis
of peptide bonds, can be put in the category:
a.
b.
c.
d.
Hydrolases
Lyases
Isomerases
Hydrogenases
______17.
a.
b.
c.
d.
The catabolic breakdown of glucose into acetyl CoA (pyruvate) is known as:
anabolysis
gluconeogenesis
oxidation
glycolysis
______18.
Oxidative Phosphorylation takes place in:
a.
b.
c.
d.
______19.
the DNA chain
the cell walls
the mitochondria
the ribosome
Identify Arginine, shown below, as a nonpolar, polar, acidic, or basic amino acid
H
H2N
C
NH CH2 CH2 CH2 C
H2N
a.
b.
c.
d.
NH3
O
O-
nonpolar
polar
acidic
basic
20.
How many moles of NADH will be formed when one mole of the fatty acid given
below completes -oxidation?
O
CH3CH2CH2CH2CH2CH2CH2C OH
a.
b.
c.
d.
3
4
2.5
5
Short Answer (40 pts total). Provide the correct answer to each of the following questions in
the space provided or in the appropriate blank. Partial credit will be awarded so show all of your
work!
1.
For the following sugars, follow these instructions:
Draw a circle around each hemiacetal carbon (2 pts. each)
Draw a square around each acetal carbon (2 pts. each)
Identify each sugar as an “alpha” or “beta” sugar by writing the appropriate word below
the picture in the blank provided. Spell out the word completely, no Greek letters!
(2 pts. each)
CH2OH
OH
O
CH2OH
CH2OH
O
O
OH
OH
O
OH
O
OH
a._________________________________
2.
O
OH
OH
OH
OH
OH
CH2OH
OH
OH
b.________________________________
Which sugar listed in the above question had a -glycosidic linkage? [a or b] (2 pts.)
3.
The following fragment of a DNA strand was used in RNA transcription to produce a
peptide chain. Show both the mRNA chain and the resulting peptide chain using the chart
attached at the end of this test. ( 3pts.)
5’ GCTTAAACTGCG 3’
(OMIT)
4.
a. Step Seven of the Krebs cycle involves the hydration of the Fumarate compound.
Draw the structure of the product you would expect from this reaction (3 pts)
COOCH
CH
+
COOFumarate
H2O
b. Step Three of the Krebs cycle involved the transformation of Isocitrate into alphaKetoglutarate with the production of CO2. In the blank provided below the reaction, what
is the name of this reaction? (3 pts)
COO-
COO-
CH2
CH2
H C
HO
C
COO-
H C
H
O
COO-
CO2
C
The two amino acids listed below will bond to create a peptide. Draw the appropriate
peptide. Label the two amino acids as polar, nonpolar, acidic, or basic. (5 pts)
H
H3C
S
CH2
CH2 C
NH3
Methionine
6.
+
COOalpha-ketoglutarate
Isocitrate
5.
H
H
O
HO
CH2 C
O-
NH3
Tyrosine
How many moles of ATP will be produced from the following ( 3 pts. each)
a.
2 moles of GTP
b.
5 moles of NADH
c.
10 moles of FADH2
d.
1 mole of acetyl CoA
O
O-