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BIO 171 - First Exam - 2018
Multiple Choice.
Place the letter of the choice that best answers the
question on the line to the left.
Two Points Each. NOTE: “e” answers are never the correct
answer.
_______ 1. Hormones would be
a. Proteins only b. Proteins or
nucleic acids c. Proteins or
lipids
d. Lipids only
e. Are there fear hormones? I think I have those…
_______ 2. DNA proofreading
molecules respond to
a. Codes for nonworking proteins
b. Nonfunctional RNA c. Shortened
codons
d. Bumps and dips on the strands
e. Bad grammar on the molecular level
_______ 3. Surface tension of water is
closely associated with
a. Cohesion b. Adhesion
c. Heat stability d. Hydration shells
e. Scumminess
_______ 4. In dynamic equilibrium, what’s
actually at equilibrium?
a. Particle flow b. Substrates
and products c. Reaction rates
d. Enzyme attach and release
e. …something…dynamic…
_______5. A saturated organic molecule
will have
a. Attached water b. All
hydrogen bonds c. Maximum carbon
content
d. No double bonds
e. A very squishy texture
_______6. Noncoding DNA contains
a. Several different types of codes
b. Membrane carriers c. Nothing
functional
d. Stretches that are actually RNA
e. DNA from the junk drawer
_______7. Hot, dry conditions are
associated with
a. Chemosynthesis
b. Allosteric inhibitions
c. C4 photosynthesis
d. Lowered turnover numbers
e. Retirement communities
_______8. Proteins are properly
folded by
a. Prions b. Conformation
enzymes c. Function factors
d. Chaperonins e. Hotel clerks
_______9. In a container of “pure” water,
how much H20 is really H+ and OH-?
a. 7% b.
1/7 c.
10-7
d. 107 e. 7
bits
_______10. Lactase helps sucrose split
into glucose and galactose – it is
a. An enzyme doing hydrolysis of a carbohydrate
b. A carbohydrate doing hydrolysis of a lipid
c. An enzyme doing dehydration synthesis of a carbohydrate
d. A lipid doing dehydration synthesis of a carbohydrate
e. Something they put in the “special” milk
_______11. Which would likely involve actin?
a. Molecule being carried through a membrane
b. Antibody attachment
c. White blood cell crawling
d. Alarmone signal
e. Um, gettin up on a stage?
_______12. Which is typically hydrophobic?
a. Amino acids b. Lipids
c. Starches d. Nucleic acids
e. What happened to “English -based” terms?
_______13. What’s the “10” in a Q10?
a. pH b. Rate of reaction
c. Temperature d. Amount of product
e. A number after 9
_______14. Which is a ligand?
a. Receptor b. Lipid
c. Substrate d. Carrier
e. Isn’t that an RPG character?
_______15. NAD and FAD
are major _________ using _________.
a. Enzymes…ATP
b. Cofactors…oxygen
c. Coenzymes…ATP
d. Electron carriers…hydrogen
e. Annoyances…stuff I don’t remember
_______16. A codon is
a. 3 possible codes for the same amino acid
b. A variation in a whole gene code
c. 3 nucleotides coding for 1 amino acid
d. 1 nucleotide coding for a 3-amino acid sequence
e. What you’re putting when it’s cold
_______17. In end-product inhibition, the
inhibitor
a. Attaches to the first pathway enzyme
b. Attaches to the last pathway enzyme
c. Attaches to the end product
d. Attaches to one or more of the substrates
e. Probably attaches to something
_______18. Which is true about decomposers?
a. They recycle all of the energy in "leftover" biological material
b. They are a type of producer
c. They recycle the materials in "leftover" biological material
d. All of the above are true
e. Dey write demusic
Short Answer.
Pick NINE questions to answer in the spaces provided.
NOTE: if you answer MORE than nine, only the first nine
will be corrected.
Four Points each. Partial credit is possible.
1. What’s it mean if two molecules are
isomers?
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2. Give an example of purposeful or
a malfunction of stereospecificity.
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| 3. At hydrothermal vents,
what’s happening - |
Geologically?
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Biologically,
production –
wise? |
4. Why is carbon
dating unreliable beyond about 60,000 years?
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| 5. Give the basic components of a
lipid molecule, including how many of each. |
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6. Briefly explain how
reradiation at a predictable frequency happens.
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7. What is the significance of
HONC? Give some details.
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| 8. Two different organic molecule
types that are always polymers - |
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9. What happens in a
coupled reaction?
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| 10. Give two different general
functions of carotenoids. |
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| 11. How do consumers
compare to producers in - |
TOTAL
BIOMASS? |
NUMBER
OF SPECIES,
TOTAL? |
| 12. In a plot of enzyme-mediated
reaction rate and pH, the rates drop off in
both directions from the optimum. Explain
the drops - |
BELOW
THE
OPTIMUM
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ABOVE
THE
OPTIMUM |
13. Ionically-bonded molecules are
rare in living things. Briefly explain
why.
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14. Why do plants produce what we
considered “digestible” starches?
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15. Chemically, what is a domain?
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16. Briefly explain how temperate lakes “turn
over.”
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| 17. What are two different cellular
chemical functions performed by minerals? |
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18. Briefly explain how ATP’s group transfer
potential works.
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19. Biologically, what is
an antenna complex?
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Long Answer.
Select and answer completely any four of the following
questions.
Note: if you answer more than four, only the first four
will be corrected.
Seven Points Each. Partial credit is possible.
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1.
Name and give a
brief description
for the four levels of protein
structure. |
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2.
All for the most common
isotope – |
40.08
Ca
Calcium
# 20
Column
2
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How many
protons?
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How many
neutrons?
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Typical
ion form?
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How many
electrons?
(Radical
form)
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3. Briefly
describe three different ways that enzymes
can be inhibited.
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4.
For four functional organic molecule
groups, give
the
name, then show the arrangement of atoms in enough detail to demonstrate
completely how each group works. |
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5. In
the
graph
below
of
Michaelis-Menten Kinetics, explain why
the curve is doing what it’s doing at each marked point, in terms of the
enzyme molecules at work. |
Can't get graph right - marked at upslope, curve near top, flat top. |
6. At the points labeled with the stars, attach the
appropriate labels from this list:
Violet. X-Ray. InfraRed. Red. Blue. Ultraviolet. |
High Frequency \ Visible Range / Low Frequency
* * / * * * \ *
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7. For the two steps of photosynthesis,
give the names of the steps and for each, list
all of the types of energy and/or
materials input and output. |
| Name |
Input |
Output |
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Link to Answer Key
BONUS QUESTIONS.
Answer as many or as few as you wish. You can't lose
points on the rest of the exam by getting these wrong. Partial credit is
possible.
How can the emission of radiation cause a change of
element? Three Points.
What body functions actually make use of oxygen radicals?
Two Points Each.
Why is there so much nitrogen in the atmosphere? Three
Points.
Sulfur is below oxygen on the Periodic Table. What should
be its function inside protein molecules? Three Points.
What critical process is done by the fungal symbionts of
plants? Three Points.
Give a plausible reason why walnuts, which definitely
contain significant amounts of protein, typically do not show it on our lab
tests. Three Points.
When proteins are made, which end is at the front spot?
Three Points.
Life’s amino acids have what hard-to-explain feature? Three
Points.
Why is it called denaturation? Three Points.
Why might an enzyme-mediated reaction hit equilibrium
quickly? Three Points.
How does the global greenhouse effect work? Three Points.
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