Exam Name__________________________________________
Sample Questions #2 (Chapters 5, 8-10, 16)
Chemistry 112
Multi ple Choice
1. The hump of the camel cont ains stores of
a) water
b) carbohydrates
c) proteins
d) triglyc erides
Reaction Pathway
A
Reaction Pathway
B
Energy
Energy
Energy
Energy
2. Which of the following repres ents the fast est, thermody namic ally fav orable reaction?
Reaction Pathway
Reaction Pathway
C
D
3. Which of the following would dissolv e in your coffee the fastest? (Assume equivalent
masses.)
a) powdered sugar
b) table sugar
c) sugar cubes
d) a lollipop
4. A biologic al molec ule is f ound to cont ain c arbon, hydrogen, oxygen, nitrogen, and
phos phorus. It is most likely to be a
a) carbohydrate
b) nuc leic acid
c) protein
d) lipid
5. The s mall organic molecule succinate is an intermediate in sugar metabolis m. The enzy me
that catalyzes conversion of succinate als o binds malonat e, which is structurally similar to
succinat e. If malonate does not undergo reaction, what is its role in this reaction?
a) substrate
b) inhibit or
c) product
d) catalyst
6. Medic ally speaking, why is consumption of human brains potentially haz ardous ?
a) Nonpolar drugs accumulate in brains, potentially leading to overdos es.
b) Brains can be infected wit h prions, leading to the human form of mad c ow disease.
c) Brains are high in saturated fat and cholesterol, leading to inc reased risk of heart attack.
d) Radioactive iodine accumulat es in the thy mus of the brain.
7. The function of an enzy me depends on which of t he following?
a) the sequenc e of its amino acids
b) its three-dimensional struct ure
c) specific interactions with its substrate
d) all of the above
8. Chromatography is:
a) used to separate molecules in a mixture bas ed on properties such as polarity
b) used to separate biological molecules with an electric field
c) used to identify molec ules based on interactions with electromagnetic radiation
d) a general name for sev eral types of tests that use color c hange to detect coc aine
9. A bag seized during a drug bust is believ ed to contain cocaine. Which of the following would
be most conclusiv e that the material is cocaine?
a) The mat erial is a white powder.
b) The mat erial giv es a positiv e res ult in the Scott test.
c) The bag is labeled cocaine.
d) The mass spectrum of the material is identical to t hat of a cocaine standard.
10. Who founded the worlds first crime laboratory ?
a) Sherlock Holmes
b) Edmond Locard
c) Gil Grissom
d) Henry Faulds
11. Whic h of the following is the major adv ant age of PCR-STR when compared to RFLP?
a) PCR-STR uses nuclear DNA, which is more unique.
b) PCR-STR can be us ed on any biological sample, whereas RFLP analysis c an be done
only on blood.
c) PCR-STR det ects differences in genes, whereas RFLP monitors non-coding DNA.
d) PCR-STR can be done on much s maller amounts of material.
12. Whic h of the following is not a macronutrient?
a) water
b) carbohydrates
c) lipids
d) proteins
13. How does the body regulate blood sugar levels?
a) The rat e of digestion slows or speeds up depending on blood sugar lev els.
b) Insulin signals cells to tak e up gluc ose when blood sugar is high.
c) Insulin signals the liv er to release glucos e when blood s ugar is low.
d) The brain uses less sugar when blood sugar is low.
14. ATP releas es energy to power cellular proces ses
a) through reaction with creatine
b) through hy drolys is to ADP
c) through oxidation
d) through neutralization
15. Which of the following is not true of aerobic exercise?
a) The maximum amount of ATP is produced during aerobic exercis e.
b) Examples of aerobic ex ercis e include bowling and golf.
c) Aerobic metabolis m c annot be s ustained for more than a few minutes.
d) Both fats and carbohydrates can fuel aerobic exercise.
Short Answer
1. Circ all le examples of potential energy below. (Flash is my dog.)
Flash taking a nap
Flash at the top of a hill on a sled
Flashs body fat
Flashs dinner
Flash ready to jump off a dock
Flash chasing a soccer ball
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2. a) Draw the energy diagram f or the energetically favorable reaction of diamonds conv erting
to graphit e, labeling the react ant and the product.
b) On the same diagram, draw the s ame reaction in the presence of a cat alyst.
c) Why doesnt all y our diamond jewelry c onvert to graphit e, giv en t hat this is the
energetically downhill direction for this reaction?
3. Next to each statement below, write the c orresponding law of thermodynamics.
_____
You can put a pig into a machine and get sausage, but you can't put sausage into the
machine and get the pig back.
_____
You cant get there from here.
_____
My shoe is off; my foot is cold, I have a bird I like to hold.
_____
You cant mak e an omelette without break ing a few eggs.
4. Circ le all the ex othermic process es below. Put an X in the box next to any proc esses for
which entropy increas es.
fireworks going off
phot osynthesis: 6 CO2 (g) + 6 H2O (g) 6 O2 (g) + C6H12O6 (s)
cold pack reaction: NH4NO3 (s) NH4+(aq) + NO3- (aq)
sublimation of H2O
burning wood
5. You are going on a backpacking trip and have t o carry all your own food.
a) Whic h would provide the most energy: a pound of fat, a pound of sugar, or a pound of
protein? (Circle one choice.)
pound of fat
pound of sugar
pound of prot ein
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all are equiv alent
b) In terms of good health, does it matter what source of energy you bring? (That is, would
fats, sugars, and proteins all be equiv alent?) Briefly explain.
6. For each type of evidenc e below, name the best technique for its analysis at the crime lab
and give a one-sentence description of the dat a produc ed and its interpretation.
a) tissue sample from Anna Anderson to det ermine whet her she was Anastas ia Romanov
b) debris collected from a possible arson
c) bag of white powder seiz ed in a drug bust
d) blonde hair recov ered from the rape of a brunet te
7. Fill in the letter(s ) of the appropriate description(s ) for each of these molecules. A molecule
may hav e more than one description.
Molecules:
__________ Car bohydr ate
__________ Lipi d
__________Pr otei n
__________Nucl eic Aci d
Descripti ons (may be used more than once):
A) building block of cell membranes
B) compos ed of amino acid building blocks
C) composed of monosacc haride building blocks
D) generally contains only carbon, hy drogen, and oxygen
E) most us eful in forens ic settings
F) the molecule shown here belongs to this class of compound
H2
C
H3C
CH3
H2
C
H2
C
H2C
CH
HO
4
H2C
CH3
CH
C
C
C
H2
C
CH
CH
C
H2
C
H2
CH3
CH
CH3
CH2
CH2
C
H
CH
H2
C
8. a) To what class of perf ormanc e-enhancing drugs does the molecule
shown here belong?
H2
C
H2 C
C
O
b) What type of athlete would most benefit from this molecule?
H2
C
CH3
H2 C
C
CH3
CH
CH
C
CH
C
C
H
O
C
CH2
C
H2
CH2
C
H2
c) Circle any of the following that would be ex pected to improve performance (wit hout
potentially s erious side effects) in an endurance at hlete on a hot day ?
ERG
EPO
carnitine
sleeping in a hyperbaric chamber
Probl ems. You must clearly show your work for full credit.
1. This question is
about the energy bar
with the label s hown
here.
a) How many
Calories are in
this energy bar?
b) Wit h the correct number of significant figures, how many joules is this ? If you didnt get
an ans wer for part a, use 100 Calories and do this question any way. (Hint: 1 cal = 4. 184
J)
2. A closed vessel c ontains 104 g of C2H2 and 300 g of O2 that react to form carbon dioxide
and water. 236 kJ of heat are releas ed per mole of C2H2.
a) Write the balanced equation for this reaction.
b) How much heat is releas ed in this reaction?
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