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SCI 135 - Second Exam Spring 2015
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. An
allele is a
________ a. A type of membrane attachment b. Molecule used for energy storage
c. The dissolved material in a solution d. Variation in the code of a gene
e. The newest flavor of alcoholic Snapple
2.
An atom that has added or lost
electrons in order to be more chemically
stable:
________ a. Ion b. Acid c. Base d. Isotope e. Obsessed with appearance
3.
In order to happen at a usable rate, cell
reactions have
to have
_______ a. Connected DNA b. Lipids available c. Heat supplied
d. Enzymes available e. The money up front
4.
Which chemical
process is essential in the digestion of
food?
________ a. Dehydration synthesis b. Spontaneous generation c. Hydrolysis
d. Endosymbiosis e. Whatever weird stuff happens in barbeque sauce
5. Someone who is lactose intolerant would have a problem
digesting a(n)
________ a. Lipid b. Protein c. Sugar d. Enzyme
e. I have no time for people who are intolerant
6. Carbon dating only works for items younger than 60,000
years. Why not older?
_______ a. Nothing is older than that b. All of the carbon is gone
c. Not enough radioactive carbon left to measure d. There are no comparison specimens
e. The dating websites have rules about ages
7. The pH of the digestive juices within the human small
intestine is between 7.5 and 8.5.
This environment could be described as
________ a. Acidic b. Neutral c. Basic d. Dehydrated e. Icky
8. A codon has _____ the "bits" as the coded amino acid
_______ a. Half b. Ten times c. Two times d. Three times e. Eaten all the bits, forget the bits
9.
Which is most closely related to a
microscope’s ability to focus clearly?
_______ a. Resolution b. Total magnification c. Clarity d. Imaging e. How drunk it is
10. Carbohydrates include
________ a. Fats & oils b. Sugars & starches c. DNA & RNA
d. Acids & Bases e. One other thing I've forgotten from studying
11. Actin and myosin are types of
_______ a. Respiratory enzymes b. Membrane lipids c. Digestible starches
d. Muscle proteins e. Words, just words without meaning
12. Electrons are
shared between atoms in
________ a. Covalent bonds b. Ionic bonds c. Isotopic bonds d. Enzyme bonds
e. Very picky divorce settlements
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.
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1. For what two different, major reasons do
plants produce
glucose? |
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2. What are the molecular "pieces" that go into a
lipid? |
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3. Given here is one side (strand) of DNA.
Starting with
this strand, show: |
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Starting____________________________________________________________________
Strand
T A A T C G
A C C T A T C T C
A A T T G C
_____________________________________________________________________
Messenger
RNA from 1st strand
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4. What makes a molecule organic?
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5. Many radicals are dangerously
reactive. Why?
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6a. In the laboratory, what is
sectioning?
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6b. Why is that
sectioning done? |
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7.
Name two different types of biological
polymers. |
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8. Explain what a DNA parasite is.
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9. What happens to an atom or molecule if it goes through an
oxidation reaction?
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10. If more Hydrogen ions are added to a solution, what
happens to the solution's pH reading?
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11. RNA and DNA molecules are built differently. Give two
differences in the way the molecules are put together. |
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12. What are the functions of the two molecule
ends in an antibody molecule? |
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13. What is it about a molecule that makes it polar?
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14. Label the following chemical
reaction with the general terms for each part – |
A + B
x > C
__________ ___________ ______________ _____________ |
15. What is a
hydration shell?
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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, What are three different biological uses for
lipids? |
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2.
All for the most common isotope –
How many protons?
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9.012
Be
Beryllium
# 4
Column 2
How many
electrons? (Radical form) |
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How many
neutrons? |
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Typical
ion
form? |
3. Using the numbers of bonds as a guide, fill in the
symbols for either Carbon, Hydrogen, Nitrogen, or Oxygen.
Can't quite
reproduce the picture - fill in your own bonds for the proper elements. |
O O O
O O O O
O O O
O O |
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4. For three basic properties of water - |
| PROPERTY |
What’s happening on the molecular level |
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5. Name and give a brief
description for the four levels of
protein structure. |
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6. What are four different types of proteins involved in
signaling? |
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7.
Give the terms for each of the two groups in
each microscope category - |
| HOW THE BEAM INTERACTS WITH THE
SPECIMEN |
NATURE OF THE
IMAGING BEAM |
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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.
What are people talking about if the subject is the
half-life of a vitamin? Three Points.
The first version of the periodic table was organized
according to what features of the elements? Three Points Each.
Earth's atmosphere is almost 75% Nitrogen. What is it about
Nitrogen that has caused it to build up until it's such a large part of the air?
Three Points.
Local lakes "turn over" in the fall and spring. What
exactly causes this? Five Points.
Antioxidants may do a couple of not-so-helpful things in
humans. What are they? Three Points Each.
What does stomach acid do to aid digestion? Three Points.
Where exactly do the numbers of the pH system come from?
Three Points.
Plastics are what kind of molecules? Three Points.
Why did they decide to call it junk DNA? Three Points.
Human skin color evolves as a response to one good thing
sunlight does and one bad thing. For Three Points Each, what are those things?
Why does an electron microscope have to have a vacuum
inside? Three Points.
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