SCI 135 - Second Exam Fall 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.   The two ends of an antibody molecule

_______                       a.  Attach to antigens and pull them apart

                                    b.  Attach to antigens to pack them together

                                    c.  Attach to antigens and signal the immune system

                                    d.  Act as poisons on the antigen carriers

                                    e.  Probably do something involving antigens


                        2.   Fiber in the diet is a stool softener because water molecules stick to the

                                                fiber molecules.  This property of water is called

_______                       a.  Adhesion                          b.  Covalency

                                    c.  Cohesion                          d.  Hydration

                                                            e.  Kind of yucky


                        3.  Two isotopes of the same element will have different

_______                       a.  Charges                              b.  Electron shells

                                    c.   Ions                                  d.  Weights (masses)

                                    e.   Personalities – and one of them will be mean


                        4.   Cholinesterase would be a

_______                       a.   Protein                              b.  Small carbohydrate

                                    c.   Lipid                                 d.  Large carbohydrate

                                    e.   Killer word in Scrabble – if the trays were bigger…


                        5.   Your muscle cells take in amino acids and make proteins,

                                                using which process?

_______                       a.   Amination                        b.  Dehydration synthesis

                                    c.   Hydrolysis                       d.  Nucleation

                                                e.  That one I can’t remember


                        6.   In the lab, the albumin was egg albumin (a protein), mixed with water. 

                                            The albumin was the  ________ and the water was the ________.

_______                       a.  Dissolvee…dissolver                   b.  Solute…solution

                                    c.  Solute…solvent                          d.  Dissolver…solution

                                                            e.  Gooey stuff…runny stuff


                        7.    A gene sequence would be _______ the length of the protein sequence.

_______                       a.  Half                       b.  Twice                    c.  Three times

                                    d. Equal to                             e. Sequential to




                        8.    Many lipid properties exist because the molecules are

_______                       a.  Polar                      b.   Hydrophobic                  c.  Hydrophilic

                                    d.  Nitrogenated        e.   Unusually annoying




                        9.   Which are polymers?

_______                        a.  Lipid and sugar                            b.  Amino acid and nucleotide

                                    c.  Protein and nucleic acid                 d.  Protein and lipid

                                    e.  Wait, I know this one, I think…maybe…




                        10.  Myosin is a

_______                       a.  Muscle protein                             b.  Structure protein

                                    c.  DNA processor                            d.  Hormone

                                    e.  How would I know what your osin is?




                        11.  If an atom has picked up an electron, it has been

_______                       a.  Redacted                           b.  Oxidized                           c.  Reduced

                                    d.  Electrocharged                  e.  Gotten the electron’s daddy mad




                        12.  Glycerol is a basic component of

_______                       a.  Amino acids                      b.  Nucleotides

                                    c.  Starches                            d.  Lipids

                                    e.  Um, something bigger than glycerol





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 two different major uses for lipids in biological systems?

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


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

3.   Briefly explain why water has surface tension.  There are two aspects to this.





4.   What are two different types of protein-based communication / signaling molecules?


5.   Radicals are dangerously reactive – briefly explain why.





6.   Briefly explain how hydration shells work on ionically-bonded salts.





7.  What is the function of enzymes?





8.   Respiration usually moves energy…





9.   For some types of proteins, what does specificity mean?





10.  Explain what is happening to the water molecules as the temperature drops -











11.  What is an allele?





12.  Carbon dating only works up to an age of about 50,000 years.  Why can’t it be used for older specimens?





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



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

                   A               +               B                        x           >                  C


           __________         ___________         ______________          _____________


15.  Briefly explain why it is useful to the plants for them to make starches that are











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.   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.





2.   All for the most common isotope –




# 19

Column 1

How many


How many



ion form?

How many

electrons? (Radical form)


3.  For carbohydrates - 


that makes

most of them -

Two main

forms -


that make

them -


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





5.   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

6.   For the pH scale shown below, fill in the proper blanks -


                                2     3     4     5     6     7     8     9     10    11    12    13

Range                                                                     *

Name            _________________          ________________         ____________________


 Ion                _______________                                                  ____________________


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.


In classification, where do the domains fit?  Three Points.



Mendeleev, the periodic table guy – what sacrifice did his mother make for him?  Three Points.



What system requires free radicals to work properly?  Three Points.



Why is there so much nitrogen in the atmosphere?  Three Points.



What parts of food molecules are broken by stomach acid?  Three Points.



Why does turning over make a lake healthier?  Three Points.



Pesticide molecules are often similar to sex hormones, but they are not meant to have similar effects.  So why are they similar?  Three Points.



The sequence of actin is very similar across widely-separated organisms.  Why?  Three Points.



The molecules released by ants under attack produce two different responses based upon their concentration – for Three Points Each, what are those responses?



What kind of molecule is the sweetener Splenda?  Three Points.



What, generally, is the family history of people who are not lactose-intolerant?  Three Points.


SCI 135 

Michael McDarby