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SCI 135 - Second Exam Spring 2016
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.
In which bond are electrons
shared?
__________ a. Hydrogen
b. Ionic c. Covalent
d. Osmotic
e. Handcuffs for two wired to a battery
2.
An unsaturated molecule
would have
_______ a. More water
b. A double bond
c. Less water
d. All single bonds
e. A definite lack of saturation
3.
Which chemical
process is essential in the digestion (breakdown) of
food?
_______ a. Hydrolysis
b. Dehydration synthesis
c. Osmosis
d. Ionic bonding
e. The creation of special sauce
4.
The fluid mosaic
model applies to
_______ a. DNA expression
b. Surface tension
c. Cell membranes
d. Electron sharing
e. Something really fancy
5.
Which of the following is not
a polymer?
_______ a. Protein
b. Nucleic acid c. Starch
d. Sugar
e. Eenimer, meenimer, mynimer, mo...
6.
An atom is most stable as an ion with
a negative one ( - ) charge. How many
electrons should it have in its outer orbital?
________ a. 1
b. 8 c. 7
d. 3 e. Oh, that's what it meant.....
7.
Which is best described as a phospholipid
bilayer?
________ a. DNA
b. Cell membrane c. Cell wall
d. Ribosome
e. A Twinkie
8.
Steroid hormones
belong to which class of organic molecule?
________ a. Lipids
b. Proteins c. Carbohydrates
d. Nucleic Acids
e. Pumped-up molecules
9.
The pH of digestive
juices in the intestine is between 7.5 and 8.5. Compared with a
neutral pH, the concentration of H+ ions should
be
________ a. Higher
b. Lower c. Equal
d. There's no way to tell
e. I saw this in the book - guess I should have figured it out...
10.
Sectioning involves
_______ a. Cell chambers
b. Cell walls c. Thin slicing
d. DNA distribution
e. Our brains falling to pieces
11.
Polydehydrogenase would belong to which class
of organic molecule?
________ a. Oils
b. Enzymes c. Starches
d. Nucleic Acids
e. No, you're not supposed to recognize the word.
12. In what kind of reaction could a molecule
pick up 2 electrons?
_______ a. Hydrolysis
b. Dehydration synthesis c. Oxidation
d. Reduction
e. A trip to the Atom Tavern
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.
In a container of pure water, explain
what happens to the molecules as the temperature
drops from 10o to 1o
C.
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2. In photosynthesis, light energy is converted into
what other form of energy?
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3. Non-coding DNA is actually a lot of
different things. What are two? |
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4. Lipid molecules are constructed
from two basic parts. What are these molecule subunits? |
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5. What exactly makes a molecule polar?
(Not necessarily bipolar!)
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6. Explain what a codon is.
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7. What
are two Kingdoms where virtually every species has a
cell wall? |
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8. What are the primary proteins
that make our muscles move? |
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9. For what two different, major
reasons do plants produce starches? |
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10. Given here is one side (strand) of DNA.
Starting with this strand, show: |
Starting_______________________________________________________________________
Strand
T A A T C
G A C C T A T C T
C A A T T G C
_________________________________________________________________________
Other DNA strand |
11. Briefly explain why
radicals are so chemically reactive.
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12.
You stir sugar into a glass of water.
What is the - |
SOLVENT?
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SOLUTE?
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SOLUTION?
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13. Label the following chemical reaction
with the general terms for each part – |
A
+ B
x >
C
__________
___________
______________
_____________ |
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14. Define these terms - |
Antigens
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Antibodies
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15. What, technically, is a gene?
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16. Which property of water
is it when water is "soaked up" by the cellulose of a paper
towel?
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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.
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1. Name
the two basic types of cells, and give three
sets of differences between them: |
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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 |
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Interaction of Beam
with specimen |
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3. Name and give a brief
description for the four levels of protein structure. |
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4.
Give four rules from the Cell
Theory. |
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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 |
6. What are three different
biological uses for lipids?
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7.
Give four different functions for some
of the proteins found embedded in cell membranes. |
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Link to Answer Key
BONUS QUESTIONS.
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 are electron levels called shells? Three Points.
What’s the common term for ionically-bonded solids? Three
Points.
In what ways can taking extra anti-oxidants be bad for us?
Three Points each.
Why is it called pH? Three Points.
Why are insecticide molecules often similar to sex
hormones? Three Points.
How might a plant respond to an alarmone signal? Three
Points.
Most “traits” are multiple-gene traits. Why? Three Points.
One type of molecule has had many new functions discovered
in the past 10 years or so – what molecule is it? Three Points.
Why did they call it junk DNA? Three Points.
When it was first discovered that sick people had lots of
bacteria, where did folks think the bacteria had come from? Three Points.
What sort of commercial use is made with plasmids? Three
Points.
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