SCI 135 - Third Exam Fall 2012

Links connect to relevant parts of the online book.







On the line to the left, place the letter of the choice that best  answers the question.

Three Points Each.                  NOTE:  "e" answers are never the correct answer.



1.   In a double-stranded chromosome, a telomere can be found

a. Holding each strand together

b. Side-by-side - it is the name of the strands

_______                c. Only during telophase

         d. At the end of each strand

e.  Only if you really really want to find it




2.   What is done with a cell by endoplasmic reticulum is done by a human with their

_______                    a.    Muscle system                           b.  Nervous system

    c.    Circulation system                      d.  Digestive system

e.   Credit cards




3.   A dominant allele works based upon the

_______                   a.  Number of genes involved                    

                                b.  Power of the DNA code

   c.  Likelihood of its being passed on

   d.  Effect of the coded protein

   e.  Quality of its, um, outfits




                    4.    A plasmid is

_______                    a.  Anything found between the nucleus and the cell membrane

                       b.  A type of mini-chromosome loop

                                c.  Thick cell projection

                                d.  Something that makes cell walls

                                e.  Not something you’d want to eat on a cracker




                     5.   When two different genes are on the same chromosome, they

_______                    a.   Are said to be linked

                                 b.  Have to both be recessive

                                 c.   Have to both be dominant

              d.  All of the above

                                 e.  Eventually get to hate each other




6.    Transfer RNA would be doing its job in a

__________              a.  Nucleus                                    b.  Ribosome

                                c.  Golgi body               d.  Lysosome             e.  Bus station




                   7.    Which act like zombies, converting victims directly into things like them?

_______                    a.   Bacteria               b.   Prions                   c.  Barr bodies

                                d.   Viruses                            e.  Microzombies



8.   The nuclear envelope is called that because it

_______                    a.  Is folded over

    b.  Is a regular membrane in a special place

                       c.  Is two membranes thick

    d.  Is a special delivery of the golgi bodies

                       e.  Always arrives just after its deadlines



9.    A point mutation occurs at what Apoint@?

_______                    a.  Nucleotide                                    b.  Centromere

    c.  Chromatid                                    d.  Anaphase

e.  A mutation point



                    10.   In response to insulin, sugar moves from the blood into liver cells for storage.
                                        During this, the concentration of sugar in the liver cells is higher than
                                        the concentration in the blood.    This process is

_______                    a.  Passive transport             b.  Osmosis           c.  Facilitated diffusion

                                 d. Active transport               e.  Liver sweetening



                     11.  A translocation mutation can cause genetic changes from

_______                    a.  A different cell                b.  A different organelle

                                c.  Position effects                d.  A change in gender

                                                    e.   Poor cell reception



                    12.  Which cell function is closely associated with the presence of

Golgi bodies?

_______                    a.  Storage                                          b.  Secretion

    c.  Reproduction                                 d.  Movement

e.  Golgi-something






Answer any eight of the following questions for 4 Points Each.

Note:  if you answer more than eight, only the first eight  will be corrected.

You can get partial credit on these answers.


1.        For a nucleolus -







2.    What two cell organelles probably first entered cells as endosymbionts?



3.   What is polyploidy?



4.    What are histones?



5.   What does having microvilli change about a cell?



6.   Briefly explain why cells probably have a maximum size limit.



7.   What are two different structures used in the cytoskeleton?


8.   What are two different Kingdoms where cell walls are common?



9.   What is done by chaperonins?



10.  Give a definition for the term mutation. 



11.  What are two different types of vesicles or vacuoles?


12.  Draw a picture of the phospholipid bilayer of a membrane.  Label the hydrophobic part and the hydrophilic part.



13.  Give a disadvantage that goes with each -







14.  Briefly explain why an insertion mutation is potentially much worse than a substitution mutation.






Answer any four of the following questions for Eight Points Each.

Note:  if you answer more than four, only the first four will be corrected.

You can get partial credit on these answers.


1.    Give three sets of differences between -






2.   Give four different functions for some of the proteins found embedded in cell membranes.




3.   Give three sets of differences, other than the genders involved, between






4.   Name the two basic types of cells, and give three sets of differences between them







5.   What are the four statements of the Cell Theory?





6.    Using this DNA code give the messenger RNA sequence and, using the chart (attached to the back of the exam), give the coded amino acid sequence.


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


mRNA   _________________________________________________________________________________________





7.   What are three different ways that fresh-water organisms protect themselves from osmosis damage?








Link to Answer Key




Answer as many as you are able.  Wrong answers will not result in points being lost from the main exam.   You can get partial credit on these answers.


When germs were discovered associated with diseases, where did people at first think they were coming from?  Three Points.




How does treating a non-bacterial disease create antibiotic resistance in disease bacteria?  Three Points.




In the lab, why did the plant cells shrink?  Three Points.




What abilities do cancer cells have to “turn on” to make the cancer really dangerous?  Three Points Each.



Why might a cell go through apoptosis?  Three Points.




How does telomerase factor into aging?  Three Points.




Molecules like chaperonins are active in what environments?  Three Points.




Why would some species have much better DNA proofreading than humans do?  Three Points.






SCI 135 

Michael McDarby





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