SCI 135 - Second Exam Fall 2013

Links in each number connect to the pertinent sections 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.   Which are polymers?

_______                    a.  Sugars and amino acids                             b.  Amino acids and fatty acids

                                 c.  Starches and nucleic acids                         d.  Lipids and proteins

                                                e.  Some sort of snack food – sounds fun!




                        2.   Some elements are called inert because they are not chemically

                                                active.  They are on the periodic table in column

_______                    a.  Four                       b.  Eight                      c.  Two

                                 d.  One                        e.  Whichever is the lazy one




                        3.   Cheek cells are flat and almost pentagonal.  That shape is mostly due to

                                                what sort of molecules in the cells?

_______                    a.  Proteins                 b.  Lipids                    c.  Nucleic acids

                                 d.  Starches                            e.  Um, flat and pentagonal-?




                        4.   Which would be a carbohydrate?

_______                    a.  Carboxylase            b.  Mannose               c.    Pyruvate

                                 d.  Polonium                          e.  Isn’t that a construction job?




                        5.    The energy that holds carbohydrate molecules together is moved into

                                                other, more usable molecules in the process of

_______                    a.  Photosynthesis                              b.  Hydrolysis

                                 c.  Respiration                                   d.  Dehydration synthesis

                                                e.  Okay, you’re just making words up now…




                        6.   Which is true?

                                 a.  Hydrophobic materials will form a hydration shell

                                 b.  Hydrophilic materials will form a hydration shell

_______                    c.  Hydrophobic materials will pick up a hydration shell

                                 d.  Hydrophilic materials will pick up a hydration shell

                                 e.  Well, I know what some of the middle words mean…



                        7.   Which bonds involve attractions between charges, full or partial?

_______                    a.   Covalent and protonic               b.  Covalent and ionic

                                 c.   Ionic and hydrogen                   d.  Protonic and hydrogen

                                                e.   Full chargey and Partyly chargey



                        8.    Organic chemistry is defined as the chemistry of

_______                    a.  Carbon-oxygen compounds                    b.  Carbon-hydrogen compounds

                                 c.  Carbon compounds                               d.  Living things

                                                                e.  Organ music




                        9.    Radioactivity is most closely associated with the number of

_______                    a.  Neutrons               b.  Outer electrons                c.  Inner electrons

                                 d.  Protons                 e.  Teensy glowy things




                        10.  An antibody is

_______                    a.  Part of an immunity reaction

                                 b.  A foreign molecule that sets off a reaction

                                 c.  A class of antibacterial drug

                                 d.  Made of RNA

                                 e.  Something uncles are attracted to




                        11.  Two atoms are walking down the street. Says one atom to the other,

                                                "Hey! I think I lost an electron!"   The other says, "Are you

                                                sure??"  "Yes, I'm positive!"  The losing atom has been

_______                    a.  Hydrated               b.  Oxidized               c.  Reduced

                                d.  Hybridized                       e.  Wait, I don’t get it…





                        12.   Water molecules are packed most closely together at

_______                    a.  0oC             b.   100oC           c.  -100oC              d.  4oC

                                                        e.  Their favorite nightclubs






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 ions are associated with the following solutions?
2.   What are two different types of protein-based communication molecules?


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


            A           +             B                              x           >               C


     __________              ___________            ______________             _____________


4.   What type of organic molecule are actin and myosin?



5.    The two parts of any lipid molecule -


6.   Briefly explain why enzymes are absolutely necessary in cells (this will be a bit more than just what they do).


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


8.   What basic processes are involved in -

Building a

protein molecule

from amino acids?

Breaking down

a protein into

amino acids?

9.   A point mutation in a gene sequence may have no effect on the protein the gene codes for.  Give two different reasons why that might happen.

10.   Give two sets of differences between DNA and RNA.

DNA has -

RNA has -



11a.  What radical released by
our cells is associated with
damage that could produce

Many aging effects?

11b.   What popular pills
are taken to try to
counteract that damage?
12.   Shown below is one side of a DNA molecule.  Fill in the other side.


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



13.  In a sentence, explain how the following terms relate to one another:  solution, solute, solvent.



14.  What are two different biological uses for lipids?



15.  Briefly explain where polarity in molecules comes from.








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





2.   Using the numbers of bonds as a guide, fill in the symbols for either Carbon, Hydrogen, Nitrogen, or  Oxygen.
The bonds don't show up here, so fill your own in to practice.

O     O     O     O    

        O     O     O     O

O     O     O     O

        O                  O


3.   For three basic properties of water -


What’s happening on the molecular level




4.   For four of the six basic Kingdoms of Life, give the name of the Kingdom and enough features to clearly set that Kingdom's members apart from those of the other five.





5.   For carbohydrates - 


that makes

most of them -

Two main

forms -




that make

them -



6.   All for the most common isotope –




# 19

Column 1

How many


How many



ion form?

How many

electrons? (Uncharged form)


 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.


What group is classified like “regular” groups, but is not included in any of the Kingdoms?  Three Points.



Most modern classification systems have a level above Kingdom.  What is it?  Three Points.



If an atom emits alpha radiation, it loses 2 protons and 2 neutrons.  How does the element change?  Three Points.



If the actual fossils can’t be dated using isotopes because they’re too old, where are the isotopes that can be dated?  Three Points.



How many electrons are shared in a triple bond?  Three Points.



Explain why it is impossible to have a container of absolutely pure water.  Three Points.



What’s it mean if a molecule is unsaturated?  Three Points.



Why were the first chemical weapons used in war soon obsolete?  Three Points.



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




What is the ”extra ability” found in steroid hormones?  Three Points.




What type of organic molecules have been recently discovered to have all sorts of uses that were not even suspected earlier?  Three Points.





SCI 135 

Michael McDarby





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