BI 171 - Third Exam - 2010

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.

_______ 1.  Which will have a lot of RNA in it?

                    a. Chromosome             b. Nuclear envelope             c. Nucleolus            d. Intermediate filament             e. The RNA supermarket

_______ 2.  The rate "drop off" from optimum temperature and pH may both involve

                    a. Changes in flux             b. Changes in particle speed            c. Changes in substrates             d. Breaking of hydrogen bonds
                                                                                e. How close to the weekend it is

_______ 3.  Recycling of materials generally happens in

                    a. Golgi bodies             b. Peroxisomes             c. Ribosomes            d. MTOCs             e. Itty-bitty special bins

_______ 4.  Microfilaments provide motion to

                    a. Muscle cells             b. Cilia             c. Flagella            d. Mitotic chromosomes             e. Avatar effects


_______ 5.  An enzyme always works by affecting

                    a. Substrate shape             b. Electron distribution            c. Speed of breakdown             d. Activation energy
                                                                            e. How angry the tiny bits are


_______ 6.  Which division stages are the most different compared to mitosis?

                    a. Prophase and anaphase of Meiosis II                                        b. Prophase and anaphase of Meiosis I
                    c. Anaphase and telophase of Meiosis I                                        d. Anaphase and telophase of Meiosis I
                                        e. Differ-phase and not-so-much-the-same-phase of Meiosis Whatever

_______ 7.  Minerals are commonly working in

                    a. Enzymes and coenzymes             b. Osmosis and enzymes            c. Cofactors and prosthetic groups             d. Cofactors and coenzymes
                                                            e. Small third-world countries, where they are being exploited


_______ 8.  In response to insulin, sugar moves from the blood into liver cells; soon, the concentration in the liver cells exceeds that of the blood,
                        and it keeps moving in. This involves

                    a. Active transport             b. Facilitated diffusion             c. Osmotic pressure            d. Passive transport             e. The liver...and the blood...

_______ 9.  A high chromosome number is associated with what type of mutation?

                    a. Deletion point mutation             b. Extra set of chromosomes            c. Extra or missing chromosome             d. Crossing over mutation
                                                                                e. Chromosomes mutate by getting high???


_______ 10.  The inside layer of a cell membrane stays in place because it is

                    a. Covalently bonded             b. Hydrogen bonded             c. Hydrophilic             d. Hydrophobic             e. Under contract


_______ 11.  Chromatin (but not chromosomes) is visible to a light microscope during

                    a. Prophase and interphase                     b. Metaphase and anaphase                    c. Prophase and telophase
                    d. Anaphase and telophase                                        e. Is it nice to spy on chromatin?


_______ 12.  Radiation damage often kills cells

                    a. Just before they divide                 b. After they divide                 c. Just after exposure                 d. Weeks after exposure
                                                                                e. After they become dog-sized and eat people

_______ 13.  Okazaki fragments are a feature of

                    a. Translation                 b. Transcription                 c. Breakdown                d. Replication                 e. Sushi slices


_______ 14.  A regulatory site would be a

                    a. Cofactor                 b. Coenzyme                 c. Domain                d. Prosthetic group                 e. Little government office


_______ 15.  Two research areas very interested in telomeres:

                    a. Aging and cancer             b. Alzheimer's and diabetes            c. Birth defects and heart disease             d. Mutations and evolution
                                                                    e. Erectile dysfunction and megaburping


_______ 16.  The purpose of a typical polar body is to

                    a. Increase sperm count             b. Store nutrients            c. Produce spindle             d. Remove unneeded chromosomes
                                                                                e. Look like it's wearing a tuxedo


_______ 17.  In dynamic equilibrium,

                    a. Reactant amounts equal product amounts                                b. Reaction rates are equal forward and backward
                    c. Flux rates are equal across and back                                       d. Particle amounts are equal on both sides of a barrier
                                                            e. It sounds like it was named by an ad executive


_______ 18.  In group translocation, which two functions occur together?

                    a. Transport through membrane and chemical change                    b. Osmosis and diffusion            c. Synthesis and breakdown
                    d. Messenger RNA production and DNA replication                                e. You stick them on a bus and drive them somewhere


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 are the two functional ends of transfer RNA?


2.  What are two totally different ways to move materials around in the cytoplasm?


3.  What is a turnover number?


4.  What are two different functions of spindle fibers?


5.  What are two different organelles found inside both prokaryote and eukaryote cells?


6.  For apoptosis -
What organelle
is commonly
7.  What are two different ways that fresh-water organisms prevent damage from osmosis?


8.  Why exactly would a cell be in trouble if its chaperonins weren't working?



9. What is likely to be a major function in a cell with lots of -

10.  Name two different enzymes that are active in DNA replication.


11.  What can be typically expected from a chemical reaction if you run it at a temperature that is 10o C warmer?



12.  Near genes are short sequences that get involved in transcription. What are two?


13.  In the dialysis tubing lab experiment, maybe the sugar flux was too slow to show up in the time allotted. What are two different reasons why the iodine flux might have been faster?


14.  What are the two main molecular components of chromatin?


15.  Which two point mutations involve a frame shift?


16.  Using this DNA code and the chart attached to the back of the exam, give the coded amino acid sequence.

             Starting   ______________________________________________________________________
  T A C G C T A G T G C T T A T G T G C A T T G C A T C



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.

1.  For dynamic equilibrium - What does
it mean?


One way to
delay reaching
it -
way to
delay it -
2.  For the two cell organelles that are thought to have started as endosymbionts:
Organelle: Function: Feature that indicates that it once was a prokaryote
(Give 2 different features)




3. Fill in the arrow-headed labels on this drawing of eukaryote cell structures.

This was a drawing with different organelles and such pointed at.


3. Describe the functions of three different types of membrane proteins.






4.  Give three sets of differences between -






5.  Give three sets of differences between the chromosomes of -






6.  Briefly describe three different ways that enzymes can be inhibited.






7.  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.

                                                                                                                               Along the top flat part


                                                                                     Where the rising curve begins to flatten out

V                                      As the curve rises steeply
                                          Substrate Concentration (as Enzymes remain constant) ---->

Link to Answer Key



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.

Explain the evolutionary significance of position effect. Three Points.

What was recently discovered about related genes in eukaryote nuclei? Three Points.

Why are chromosomes in drawings almost always shown in double-stranded form? Three Points.

What cell structure apparently has no name? Three Points.

Some people feel that the appearance of exons and introns in organisms in the distance past led to complex life. Why would they be important? Three Points.

What evidence supports the idea that a fusion event happened during human evolution? Three Points.

What organisms seem to be "okay" with polyploidy mutations? Three Points.

What seems to be the limiting factor in many ocean algae populations? Three Points

What other processes follow a Michaelis- Menten pattern? Two Points Each, up to 3.

What happens during crossing over that helps solve a huge question about evolution? Three Points.




BI 171



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