BI 171 -
Third Exam - 2005
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.
Movement of materials 1. within a cell can be
a. Mitochondria and chloroplasts
b. Microtubules and endoplasmic reticulum
c. Ribosomes and microfilaments
d. Flagella and cilia
e. Tiny rubber bands and teeny spitball launchers
_______ 2. Cofactors are commonly
e. Paid less than factors
Cells going through 3. apoptosis generally
a. Exist in low- or no-oxygen environments
b. Increase their surface area
c. Produce poisons
d. Digest themselves
e. Donít even speak Greek
4. Histones are most active during the early
a. Microtubule production
b. DNA transcription
c. Enzyme activation
d. DNA translation
e. Warm-ups for American Idol
Variations in 5. pH affect enzyme activity mostly
because they can affect
a. Stability of substrates
c. Stability of products
d. Hydrogen bonds
e. Where the capital letters are placed
In a 6. coupled reaction
a. Enzyme one feeds product to enzyme two
b. Endergonic feeds energy to exergonic
c. Exergonic feeds energy to endergonic
d. Reaction one feeds product as reactant into reaction two
e. Thereís a modest ring ceremony and a conservative protest
7. Chaperonins should be found near
c. Cell membrane
e. Tiny proms
When liver cells remove sugar from the blood, the
concentration in the liver cells 8.
is higher than levels in the blood. This movement involves
a. Passive transport
c. Active transport
e. A series of sharp right turns
9. Root pressure is generated by
e. Leaves making fun of the roots
10. Centromeres can attach to
a. Messenger RNA
e. Random freaks met in bars
A 11. cell membraneís phospholipid molecules have
a. A single phosphate instead of a fatty acid
b. Two phosphates instead of two fatty acids
c. Phosphate instead of glycerol
d. Phosphate instead of cholesterol
e. Very poor self images
12. Affinity exists between
a. Neighboring cells
b. Enzymes and substrates
c. Genes and proteins
d. DNA and RNA
e. What you think it is and what it really is
13. Pseudopods are commonly used for
d. Reversing flux
e. Examples of nasty terminology
When proteins are inserted into membranes, they take
up a proper position due to 14.
b. Hydrophobic domains
c. Prosthetic groups
d. Covalent bonding to membrane molecules
e. Their refined breeding and elegant upbringing
15. Activators, promoters, and enhancers
a. Adjusting flux across a membrane
b. DNA transcription
c. Bringing enzyme-mediated rates to equilibrium
d. Cell reactions to changing temperature
e. The music industry
A cell would have a 16. contractile vacuole when
its surroundings are
a. Hypertonic or hypotonic
b. Hypertonic only
c. Hypotonic only
d. Hypertonic, hypotonic, or isotonic
e. Really, really contractile
Two proteins with similar 17. primary structures
have different functions - they are
a. Both analogous and homologous
b. Neither analogous nor homologous
c. Analogous but not homologous
d. Homologous but not analogous
e. This is seriously deja vuíd, dude!
Which best explains why 18. plant cells have
a. Cell walls are a type of secretion
b. Cell walls are made of carbohydrates
c. Photosynthesis produces many waste materials
d. Chloroplasts have to able to leave the cell
e. They got them on sale
Pick NINE questions to answer in the spaces
provided. : if you answer MORE than nine,
NOTE only the
will be corrected. first nine
Four Points each. Partial credit is possible.
RNA binds temporarily to what two other
types of molecules?
What is a function of 2.
There are 3. two factors that make
reaction rate at temperatures drop below optimum.
What are they?
4. 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 C A A C C G A T T T C T C T T C A T C
How is a 5. nuclear envelope structurally
different from other internal membranes?
What are 6. two different ways to prevent
an enzyme-catalyzed reaction from reaching
What is an 7. allosteric
In cell chemistry, what is a 8.
explain how the codon version of genetic redundancy works.
Define 10. Q 10.
11. What are
two ways that prokaryote chromosomes differ from
12. Why is mitochondrial DNA
more useful in evolutionary studies than nuclear
13. What is an
What are 14. two different structures that
are microtubule-organizing centers?
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.
For 1. three factors that can affect the
rate at which flux moves toward equilibrium, give the factor and
explain how that factor has to change to speed the
Briefly 2. describe three
ways that different enzymes can be inhibited.
Give 3. three sets
of differences between -
4. For the drawing below, label any
four different types of organelles or structures.
For each type of 5. cytoskeleton component, name
the component and then give one fact about that
In the graph below of 6. Michaelis-Menten
Kinetics, explain why the curve is doing what itís doing at each
marked point, in terms of the enzymes at work.
Link to graph type (marks were on upslope, near top, and along top
7. Describe the functions of three of
different types membrane proteins.
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
For Three Points Each, what sorts of
functions have been discovered for what used to be called
What two areas of money-rich research
are interested in the function of telomeres? Three Points Each.
Why doesnít reversibility exactly apply
to enzyme-catalyzed reactions? Three Points.
Explain why a metabolic pathway
trait has to be a multiple gene trait. 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.
GENE TRANSLATION TABLE
CODONS ON MESSENGER RNA
Itís okay to tear this sheet off the exam.