BI 171 - Third Exam - 2003

Links go to pertinent sections of the book.

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. The 9 + 2 pattern involves

                    a. Cell connections in multicelled systems                     b. Microtubules
   
                     c. Particle exchange through a membrane                      d. Chromosomes
   
                                                                 e. Ummmm, eleven-?

 

_______ 2. Which are the reactions in coupled reactions?

                    a. Hydrolysis & dehydration synthesis
   
                     b. Oxygen-producing & oxygen-using
   
                     c. Endergonic & exergonic
                    d. Enzyme-catalyzed & non-enzyme-catalyzed
   
                     e. Thatís really no oneís business but theirís

 

_______ 3. A ligand can also be called a

                    a. Chaperonin                     b. Domain                     c. Channel
                    d. Substrate                                 e. Suitably nasty name

 

_______ 4. The plant cells in the lab exercise, in fresh water, are surrounded by which 
                                type of
solution?
                    a. Hypotonic                     b. Hypertonic                     c. Isotonic
   
                     d. Cytotonic                                     e. Toonytonic

 

_______ 5. A protein other than enzymes that follows Michaelis-Menten patterns:

                     a. Microtubules                     b. Histones                    c. Carriers 
                    d. Centromeres   
                                     e. Annoying ones

 

_______ 6. Introns are

                    a. Materials released from a cell
   
                     b. Parts of an enzyme that are not functional
   
                     c. Byproducts of an enzyme-catalyzed reaction
   
                     d. Parts of a gene sequence that are not used in the coded protein
   
                     e. Some sort of big honkiní corporate monster

 

_______ 7. A cell membraneís fluidity is affected by

                        a. Phosphate groups                 b. Carriers                 c. Cholesterol
                   d. Flux                                                 e. How drunk it is

 

_______ 8. Which is a critical protein in microfilaments?

                    a. Actin     b. Dynein      c. Thylakoid      d. Kinesin     e. Filamentin

 

_______ 9. Which are, on a molecular level, most analogous to spools?

                    a. Plasmids                     b. Histones                     c. Microtubules
                    d. Microfilaments                         e. Twirlyloopidies

 

_______ 10. Which process has its first steps occur in the cytoplasm?

                     a. Photosynthesis                         b. DNA transcription  
                    c. RNA production                       d. Aerobic respiration
   
                                                 e. Training camp

 

_______ 11. Which are most likely to be covered by microvilli?

                    a. Breathing tube cells moving mucus
   
                     b. Kidney tube cells moving wastes into urine
   
                     c. Protective skin cells
   
                     d. Cells inside a mitochondrion
   
                     e. The typical cafeteria lunch

 

_______ 12. If the products of a reaction are continually removed, the reaction will 
                                reach
equilibrium

                    a. Faster                 b. Slower                 c. At the same rate
   
                     d. Never                             e. Next Tuesday

 

_______ 13. Which is counteracted by gravity?

                    a. Turgor pressure             b. Telomerase             c. Root pressure
                    d. Optimum pH                             e. Spandex

 

_______ 14. An enzyme with a low Michaelis constant has high affinity, which means it

                    a. Works with multiple substrates                 b. Is limited in substrate choice
                    c. Works more slowly                                 d. Works more quickly
   
                                                             e. A finí lookiní enzyme

 

_______ 15. Waterproof body coverings probably first evolved as an adaptation to

                        a. Land environments                        b. Salty marsh environments
                    c. Fresh water environments             d. Deep ocean environments
   
                                                             e. Matching boots

 

_______ 16. Which would most likely involve glycocalyx?

                    a. Recognition between cells in multicelled systems
   
                     b. Movement of a cell across a surface
   
                     c. Movement of a cell by swimming
   
                     d. Connections between cells in multicelled systems
   
                     e. An alphabet chart and a handful of darts

 

_______ 17. A Q10 compares a reactionís rate with the reaction under what changed condition?

                        a. Ten times more reactant                         b. Ten times less reactant
                   c. 10o C rise in temperature                        d. 10o C drop in temperature
   
                                 e. Ten times more colorful gay guys criticizing it

 

_______ 18. Group translocation involves what two processes?

                    a. Transport in and transport out
   
                     b. Transport and chemical change
   
                     c. Removal of one organic group and replacement by another
   
                     d. Movement of genetic materials between two cells
   
                     e. Confusion and induction of anger

 

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 two different types of molecules, associated with enzymes, contain minerals?
 

 

2. How exactly does a phospholipid molecule from a cell membrane differ from a "typical" lipid molecule?

 

 

3. Briefly explain the reasoning behind how a protein or DNA sequence can be used as a molecular clock.

 

 

4. Give a complete definition for turnover number.

 

 

5. A cell with a lot of Golgi bodies in it would probably be doing what?

 

 

6. What are the two attachment ends of transfer RNA typically attached to?
 

 

7. Name or describe two different types of Microtubule-Organizing Centers.
 

 

8. What are two different general features of active transport?
 

 

9. Particles may be excluded from cell membrane pores according to what two features?
 

 

10. Which two organelles have internal membranes and their own DNA?
 

 

11. By what mechanism do prokaryotes come closest to the genetic recombination of sexual reproduction?

 

 

12. Name two different types of plastids.
 

 

13. Given that the "barrier" is permeable to everything, show how the various materials should flux between the boxes
60% Water

20% Sodium

20% Glucose

70% Water

25% Sodium

5% Glucose

14. Name two structures associated fairly exclusively with the nucleus.
 

 

15. Using the table attached to the exam (detach it if you need to), translate this gene sequence into an amino acid sequence -

       T  A  C  G  G  T  A  G  G  C  G  A  A  G  G  C  C  C  G  G  T  A  C  T

 

 

 

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, Give three sets of differences between -

CILIA

FLAGELLA

 

 

 

 

 

 

2. Briefly explain three different approaches used in the inhibition of enzymes.
 

 

 

 

 

 

3. Name and give the basic function of three different types of vesicles or vacuoles.
 

 

 

 

 

 

4. Briefly describe four ways that flux can be increased through a barrier.
 

 

 

 

5. In the graph below of Michaelis-Menten Kinetics, explain why the curve is doing what itís doing at each marked point, in terms of the enzymes at work.
 

                                                                                         _________________________________________
                                                                  * * * * * X * * * * * * * * * * * * * * * * * * * * * * * * * * 
            Reaction                                X
                                                        *   _____________
________________________
              Rate                                *
                                                     *
               V                                  *    ____________ __________________________
                                                   *
                                         _____________________________________________________________
                                                    
Substrate Concentration (as Enzymes remain constant) ---->

6. When enzyme activity on reaction rate is graphed by temperature, the rate declines on each side of an optimum. As temperature moves away from the optimum, explain what happens on a molecular level to makes the rate decline -
Below the optimum,
as the temperature
drops?
Above the optimum,
as the temperature

rises?
7. Fill in the labels on this drawing of eukaryote cell structures.

This would have been a simple line drawing with several cell structures indicated.

 

 

 

 

 

 

 

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.

 

Name the general terms given to the various proteins that contribute to DNA translation. Three Points each.

 

 

Briefly explain how one codon can stand for two different things. Four Points.

 

 

Enzyme-catalyzed reactions are not reversible through the enzymes. Why? Four Points.

 

 

What is the typical limitation of the term vitamin? Three Points.

 

 

Some enzymes have a broad, low curve for their temperature - activity graph. Why? Four Points.

 

 

Cancer cells develop two capabilities that most normal cells, including the original cells that became cancerous, do not have. For Three Points each, what are they?

 

 

Which Kingdom of organisms do not have cell walls? Three Points.

 

 

Where do steroid hormones usually connect on / in a cell? Four Points.

 

 

GENE TRANSLATION TABLE

CODONS ON MESSENGER RNA

First

Letter

SECOND

LETTER

Third

Letter

U

C

A

G

U

phelyalanine

serine

tyrosine

cysteine

U

U

phelyalanine

serine

tyrosine

cysteine

C

U

leucine

serine

STOP

STOP

A

U

leucine

serine

STOP

tryptophan

G

C

leucine

proline

histidine

arginine

U

C

leucine

proline

histidine

arginine

C

C

leucine

proline

glutamine

arginine

A

C

leucine

proline

glutamine

arginine

G

A

isoleucine

threonine

asparagine

serine

U

A

isoleucine

threonine

asparagine

serine

C

A

isoleucine

threonine

lysine

arginine

A

A

*START*
methionine

threonine

lysine

arginine

G

G

valine

alanine

aspartate

glycine

U

G

valine

alanine

aspartate

glycine

C

G

valine

alanine

glutamate

glycine

A

G

valine

alanine

glutamate

glycine

G

 

 

BI 171

McDarby

 

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