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BI 171 - Third Exam - 2008
Each question's number
is linked to the relevant part of the online book, if possible (some questions
relate to multiple sections).
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.
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1. What part of a cell membrane is most
likely to move around fluidly?
a. Proteins b. Histones
c. Phospholipids d. Minerals
e. The flowy bits
_______
2. A shift in pH usually affects enzymes
through an effect on
a. Temperature b. Inhibitor
binding c. Use of oxygen
d. Hydrogen bonds e. Their
self-esteem
_______
3. Okazaki fragments are made of
a. RNA
b. Tubulin
c. DNA
d. Pore proteins
e. Bits of okazaki
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4. The endosymbiont theory applies to the
a. Mitochondrion and chloroplast
b. Mitochondrion and cell wall
c. Nucleus and cell wall
d. Flagellum and cilia
e. List of things with unnecessarily complicated names
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5. If a reaction uses multiple reactants, the reactant
in shortest supply should be the
a. Michaelis minimum
b. Inhibitor
c. Regulatory substrate
d. Limiting factor
e. One on your shopping list
_______
6. Chromatids become chromosomes when
a. They separate at the centromeres
b. They connect to spindle fibers
c. They wrap around histones
d. They are used to make proteins
e. They submit the proper paperwork
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7. Cytokinesis should never happen during
a. Interphase
b. Anaphase
c. Prophase
d. Telophase
e. November
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8. Which molecular complex would be storing RNA?
a. Nucleolus
b. Chromosome
c. Golgi complex
d. Centrosome
e. Why, is it worth something?
_______
9. In a Q10,
the "Q" part is
a. Equilibrium
b. Reaction rate
c. Flux rate
d. Affinity
e. Can't I do the "10" part?
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10. Lysosomes are associated with
a. Secretion
b. Division
c. Movement
d. Digestion
e. Not telling the truth
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11. Helicase is a key enzyme in
a. Absorption
b. DNA replication
c. Spindle formation
d. Membrane formation
e. Doing a heli a job
_______ 12. A metal ion that must bind temporarily to an enzyme's active
site for the site to work:
a. Prosthetic group
b. Coenzyme
c. Cofactor
d. Inhibitor
e. Metal buddy
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13. An allosteric effect involves
a. Ionization
b. Gene expression
c. Enclosure
d. Shape changes
e. An effect that's steric, in an allo way
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14. Where is there likely to be a MTOC?
a. Mitochondrion
b. Nucleus
c. Rough endoplasmic reticulum
d. Base of flagellum
e. Um, IDY
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15. What is the primary content of a polar
body?
a. Spindle
b. Secretion
c. Carbohydrates
d. Chromosomes
e. Blubber
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16. In many coupled reactions,
a. ATP provides the exergonic reaction
b. ATP provides the endergonic reaction
c. Only the exergonic reaction uses enzymes
d. Only the endergonic reaction uses enzymes
e. Things are okay until one reaction cheats
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17. Actin is a
a. Phospholipid found in cilia
b. Protein in membrane pumps
c. Nucleic acid in centromeres
d. Protein in microfilaments
e. Something you might combine with singin and dancin
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18. What disappears during
prophase?
a. Chromosomes
b. Nucleolus
c. Spindle
d. Cell wall
e. Dignity
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.
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1. Name two different types
of functional vacuoles. |
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2. Give two sets of differences
between - |
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CILIA |
FLAGELLA |
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3. Intermediate filaments can often
be found in cells under what special conditions? |
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4. Explain why the reaction rate drops
off on both sides of the optimum temperature
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BELOW
OPTIMUM
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ABOVE
OPTIMUM
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5. What are two different materials
to which a typical cell membrane is permeable? |
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6. For dynein and kinesin - |
SIMILAR
FUNCTIONS -
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DIFFERENT
FUNCTIONS -
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7. What is the key feature by
which active transport can be recognized? |
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8. How exactly does a phospholipid
molecule from a cell membrane differ from a
"typical" lipid molecule? |
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9. In
point mutations, why is an deletion usually much
worse than a substitution? |
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10. Describe two different ways that
indirect enzyme inhibition can work. |
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11. What are two different ways to
prevent on ongoing chemical reaction from reaching
dynamic equilibrium? |
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12. What is the main purpose of
microvilli? |
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13. What two things happen
during group translocation? |
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14. Briefly describe two things that
happen when prokaryotes divide that do not
happen when eukaryotes divide. |
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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. Give three different ways
of adapting to hypotonic conditions, and for each give an
example of an organism that uses that adaptation. |
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2. 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.
The graph itself isn't completely shown here, but it's in the
notes and linked to in the book. |
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Label on top flat part of graph
Reaction
Label where curve begins to flatten out
Rate
V
Label on rising part of graph.
_____________________________________________________________
Substrate Concentration (as Enzymes remain constant) ---->
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3. Describe the functions
of three different types of membrane proteins. |
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4. Fill in the arrow-headed labels on this drawing of
eukaryote cell structures. |
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hand-drawing of a cell with various structures pointed at. |
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5. What are three sets of differences
between mitosis and meiosis? |
| MITOSIS
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MEIOSIS |
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6. Briefly describe four ways that flux
can be increased through a barrier. |
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7. Give three sets of differences
(other than the associated genders) between - |
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EGG CELLS |
SPERM |
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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.
Many reactions that happen in cells are not reversible in any practical way.
Why not? Three Points.
In a graph of enzyme-catalyzed reaction rate and temperature, what sort of
organisms typically have very broad but fairly short curves? Three Points.
What sorts of materials often show an ability to irreversibly inhibit
enzymes? Three Points.
What detoxification pathway shares an enzyme with acetaminophen? Three
Points.
What's the major difference between the two pronunciations of apoptosis?
Three Points.
Why is mitochondrial DNA preferable for use in molecular clocks? Three
Points.
What sort of animal is covered with microvilli? Three Points.
What would the ligand for a hormone receptor be? Three Points.
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How can crossing over be used to map gene locations on chromosomes? Four
Points.
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