SC 135 - Second Exam Spring 2011

 

Links connect to relevant parts of the online book.

 

 

MULTIPLE CHOICE. 

 

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.   What is the proper difference?

_______                a.  RNA is much longer than DNA                                             b.  RNA is double-stranded, DNA is single-stranded

c.  RNA is single-stranded, DNA is double-stranded                    d.  RNA is a carbohydrate, DNA is a protein

                                                    e.   RNA can take DNA=s lunch money

 

 

 

2.   Lipids act as water barriers because they

 

_______                a.  Are hydrophobic                                     b.  Are hydrophilic                        c.  Do dehydration synthesis

                             d.  Aren=t digestible                                                    e.  Never got the skills for a better-paying career

 

 

 

3.    Two atoms of the same element are triple-bonded to each other.  The element is

 

_______                a.  Naturally radioactive                 b.  Found in column 5               c.  Found in column 3                 d.   Hydrophobic

                                                    e.  A little kinky

 

 

 

4.   Why aren=t electron microscopes generally used to look at living cells?
 

_______                a.  Cells are too small to see                       b.  No one can afford it                        c.  Specimens are put in a vacuum

                            d.  Beam is too small                                                        e.  >Cause until now, nobody thought of it.

 

 

 

5.   If a large molecule is broken down to bits, what process is involved?

 

_______                a.  Dehydration digestion                b.  Dehydration synthesis                c.  Polarity distribution                   d.  Hydrolysis

                                            e.  It involves calling the large molecule nasty names

 

 

 

6.    A allele is

 

_______                a.  A variant gene sequence                b.  A protein with a different function                c.  Always made of RNA

                            d.  All of these                                                            e.  Kind of a weird word

 

 

 

 

7.    At which Celsius temperature would water be most dense?

 

_______                a.  100^o                       b.  4^o                           c.  0^o                           d.  -25^o

            e.  Isn=t water pretty dumb at any temperature?

 

 

 

 

8.   The tiniest gap visible allows the measurement of

 

_______                a.  Magnification                b.  Ultrastructure                c.  Resolution            d.  Beam spread                e.  Jean tightness

 

 

 

 

 

9.    Radioactivity is directly connected to the number of  ______ in an atom.

 

_______                a.  Neutrons               b.  Protons                 c.  Electrons                d.  Photons                    e.  Electrical outlets

 

 

 

 

 

10.   Actin is a

 

_______                a.  Lipid used in barriers                b.  Protein used in movement                    c.  Carbohydrate used in energy storage

d.  Nucleic acid found in bacteria                                e.  Thing done on stage in Alabama

 

 

 

 

 

11.   In a gene, the ratio of nucleotides to amino acids in the protein is

 

_______                a.   One to one                       b.  Four to one                       c.  Two to one                    d.   Three to one

                                                                                        e.   A scootch to a zillion

 

 

 

 

 

12.    Since anti-oxidants prevent oxidation, they would prevent

 

_______                a.  Electrons being added to compounds                                    b.  Electrons being stolen from compounds

c.  Oxygen being added to compounds                                      d.  Oxygen being pulled off of compounds

                                                            e.  It all sounds pretty violent

SHORT ANSWER.  

 

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.    Briefly explain why individual water molecules have to be very hot to evaporate.

2.    What happens on the two ends of an antibody molecule?

3.    Here is a chemical reaction.  Give the general terms (do not give the names of the compounds!) here that would apply to any similar reaction.

CO2        +        H2O                   light        >         C6H12O6      +         O2           __________   __________        ___________           __________             ___________

4.     Why would some specimens have to be sectioned?

5.    For a molecule to be considered organic, it must have -

6.   Much of our DNA is not genes.  What are two different things that non-coding DNA is?

7.   Why, exactly, does Carbon dating not work well on things older than 50000 years?

8.   How are isotopes of the same elements different?

9.    What are two different classes of molecules that are polymers?

10.   Give examples of these two properties of water in action -
ADHESION -	COHESION -

11.   Why can lipids make especially good poisons?

12a.   Which bond type can have many different strengths in a single molecule?

Why does the strength vary?

13.   What are the two types of pieces in a lipid molecule?

LONG  ANSWER. 

 

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.   Microscopes can be split into two main groups based upon either listed feature.  For each feature, name the groups.
Nature of the Imaging Beam -
Interaction of Beam with specimen -

3.   How many        protons?	79.904 Br Bromine # 35 Column 7   How many electrons? (Radical form)
How many neutrons?
Typical ion form?

4.   What are four different types of communication molecules?

5.   For carbohydrates -
Process that makes most of them -	Two main forms -
Organisms that make them -

6.  Using the numbers of bonds as a guide, fill in the symbols for either Carbon, Hydrogen, Nitrogen, or  Oxygen.   Like in class, there was a molecule drawn with the bonds shown connecting the mystery atoms.

7.    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                     _________________     _____________    ____________________             Active              Ion                         _______________                                   ____________________