SCI 135 - Second Exam Spring 2014

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.   A plasmid is

_______                       a.  The surface of interacting water droplets

                                    b.  The lipid part of a cell membrane

                                    c.  A type of catalyst

                                    d.  A supplement to a prokaryote’s DNA

                                    e.  A weird blob in your salad dressing


                        2.    Ionic bonds are not major “players” in biological systems because of

_______                       a.   Their weakness                           b.  Their strength

                                    c.   Hydration shells                         d.  The components’ uselessness

                                    e.  The way the other bonds make fun of them


                        3.   Actin and myosin are

_______                       a.  Amino acids                     b.  Muscle proteins

                                    c.  Antibody types                d.  Enzymes

                                                            e.  Daft Punk


                        4.   How clear a system can focus is a measure of its

_______                       a.  Magnification limit                     b.  Clarity

                                    c.  Projection                                     d.  Resolution

                                                                        e.  Sobriety


                        5.   Hydrolysis is a critical reaction in

_______                       a.  Digestion                                      b.   Enzyme function

                                    c.  Solution formation                      d.   Freezing

                                    e.  Something I’m supposed to remember – unless it’s a trick!



                        6.   Sectioning would be done

                                    a.  To make certain genes easier to find

                                    b.  By enzymes to substrates

_______                       c.  To make something more transparent

                                    d.  Lipid barriers

                                    e.  To keep the cool folk separate from the morlocks



                        7.    The process of photosynthesis builds

_______                       a.  Lipids                                            b.  Carbohydrates

                                    c.  Proteins                                         d.  DNA

                                                            e.  Um, plants?




                        8.    A material that prevents oxidation would

_______                       a.  Keep electrons from being taken

                                    b.  Keep electrons from being given up

                                    c.  Keep oxygen from combining with atoms

                                    d.  Keep oxygen from being released from molecules

                                    e.  Keep oxygen atoms off of eHarmony




                        9.    In a base, the predominant ion is

_______                       a.   Na+                b.  H+               c.  Cl-                     d.  OH-

                                           e.  Whichever one can beat the other ones up




                        10.   Lipase would be a type of

_______                       a.  Enzyme                           b.  Oil                         c.  Carbohydrate

                                    d.  Receptor                           e.  Cheap gloss




                        11.  Which can be hormones?

_______                       a.  Carbohydrates & proteins         b.  Carbohydrates & lipids

                                    c.  Lipids & proteins                                    d.  Carbohydrates & nucleic acids

                                                            e.  Well, that there’s some crazy juice…




                        12.  Water has its greatest density at

_______                       a.  0oC                                     b.  100oC

                                    c.  4oC                                     d.  -100oC

                                    e.   Can’t it just be good, does it have to be the greatest?





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.   What are the two components of a lipid molecule?


2.   The current best explanation for why cells seem to have a size limit involves the relationship between –



      __________________________      AND     __________________________


3.   Carbon dating doesn’t work well on things older than 50,000 years.  Why not?





4.   Two different types of molecules that are natural polymers:


5.    Label the following chemical reaction with the general terms for each part –


        A           +             B                        x           >            C


   __________         ___________         ______________          _____________

6.   If non-coding DNA  isn’t “junk,” the it must be something.  What are two different “somethings” that non-coding DNA can be?

7.   Give two reasons why only the most energized / hottest water molecules can get free during evaporation.


8.   Given here is one side (strand) of DNA.  Starting with this strand, show:

Starting  _______________________________________________________________________________

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



                                     Messenger  RNA from 1st strand

9.  Why is it very useful for some toxins to be lipid-soluble?




10.  What is meant by the term chemical pathway?




11.  For the sugar solution used in the lab, what was the -





12.  Briefly explains what happens in a double bond.




13a.  Which radical is often released during cell activities?

13b.  Why is that radical (or radicals in general) particularly reactive?




14.  What are the functions of the two molecule ends in an antibody molecule?


15.  What produces polarity in a molecule?






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 four rules from the Cell Theory.





2.   Give the terms for each of the two groups in each microscope category -




3.   Name and give a brief description for the four levels of protein structure.



4.   Using the numbers of bonds as a guide, fill in the symbols for either Carbon, Hydrogen, Nitrogen, or  Oxygen.


                      O     O     O     O    

       O     O     O     O

       O     O     O             O

  O                  O


5.   Pick any two - define the terms.


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





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.


Why is it really important that local lakes “turn over”?  Three Points.




What is the main function of stomach acid in the digestive process?  Three Points.




Fiber “uses” what property of water to relieve constipation?  Three Points.




Why did the sugars in the Benedict’s test not react until they had been heated?  Three Points.




Why would plants produce starches that are relatively easy to break down?  Three Points.




What does waxy leaves indicate about a plant’s natural environment?  Three Points.




How do prions cause cells to malfunction?  Three Points.




What molecule type has, in just the last decade, been found to have many many new cellular functions?  Three Points.




What do dissecting microscopes have that makes them more useful for doing dissections than the “regular” microscopes?  Three Points.







SCI 135 

Michael McDarby