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BIO 171
- First Exam
- 2015
Links go to pertinent
passages of book
Multiple
Choice.
Place the letter of the choice that best answers the
question on the line to the left.
Two Points Each. NOTE: “e” answers are never the
correct answer.
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1. Which would be the main process of a
digestive system?
a. Dehydration synthesis b.
Dynamic equilibrium c.
Carboxylation d. Hydrolysis
e. How come "digestion" isn't one of the choices?
_______
2. Chaperonins are involved in
a. Enzyme regulation b. Gene
expression c. Protein folding
d. Rate equilibrium
e. Molecule proms
_______
3. Which commonly involve some sort of mineral
or metal?
a. Ligands and binding sites
b. Cofactors and prosthetic groups
c. Coenzymes and cofactors
d. Ligands and prosthetic groups
e. Nasty scraping sounds
_______
4. Plant starch and plant fiber
are similar molecules but differ in
a. Types of bond linkages b.
Amounts of Nitrogen c. Amino
acid order
d. Amounts of Sulfur
e. Yummy goodness
_______
5. Which would most likely not have much
stereospecificity?
a. Antibodies b. Sense receptors
c. Enzymes d. Codons
e. People who buy their components at Wal-Mart
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6. A
base, by definition,
a. Adds H+ to a solution, lowering pH
b. Removes H+ from a solution, lowering pH
c. Adds OH- to a solution, raising pH
d. Removes OH- from a solution, raising pH
e. Wait! I know this! ...How come none of the answers refer to baseball -?
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7. Most cellular synthesis reactions are
a. Enzyme-mediated b.
Coupled c. Endergonic
d. All of the above e. Very
tiny
_______
8. The numbers of valence
electrons in an atom are most closely associated with
a. Its weight b. Its
chemical properties c.
Radioactivity d. Its atomic
number
e. Its odor
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9. The "D" of DNA and the "R" of
RNA are based upon which part of the molecule?
a. Sugar b. Amino Acid
c. Phosphate d. Nitrogenous base
e. The diggelly-riggelly part
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10.
The Michaelis Constant
(km) is a measure of
a. Reaction rate b.
Equilibrium point c. Enzyme
activity d. Energy release
e. If it’s constant, isn’t it always the same measurement?
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11. Which was most obviously hydrophobic?
a. Sugar b. Starch
c. Vegetable oil d. Protein
e. Well, how obvious was it?
_______
12. Carbon dating doesn’t work past about
60,000 years because there is
too little _______ to accurately measure
a. Nonradioactive carbon b.
Radioactive carbon c.
Radioactivity d. All of
these
e. Profile updating
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13. An R group is part of a(n)
a. Amino acid b. Starch
c. Nucleic acid d.
Mucopolysaccharide
e. A bunch of people yelling, "Arrrgh!"
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14. Which is a domain?
a. Allele b. Coenzyme
c. Cofactor d. Regulatory site
e. www.biologysucks.org
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15. A hydrocarbon is said to be unsaturated
if
a. It has one or more double bonds between carbon atoms
b. It contains more than one functional group
c. Each internal carbon atom is covalently bonded to two hydrogen atoms
d. One end of the molecule is hydrophilic while the other end is hydrophobic
e. It isn't wet enough
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16.
ATP often
works through
a. Electron transfer b.
Group transfer potential c. Ionic
activation d. All of these
e. Intimidation and extortion
_______
17. Glucose and fructose are both C6H12O6,
but their atoms are arranged differently,
which makes them
a. Polysaccharides b.
Disaccharides c. Isomers
d. Soluble
e. Something to avoid at all costs
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18. Tubulin in your food would be
absorbed as
a. Sugars
b. Starches
c. Nucleotides
d. Amino acids
e. There’s tubulin in my food? Is it making me rounder?
Short Answer.
Pick NINE questions to answer in the spaces provided.
NOTE: if you answer MORE than nine, only the first nine
will be corrected.
Four Points each. Partial credit is possible.
1. What is Dynamic Reaction Equilibrium?
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2. Put the simple hydrocarbons in order according to
how
many carbons they have. |
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2 |
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3. Give two fairly specific types of
limiting factors in cellular reactions. |
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4. What are two different types of the
major organic
polymers found in organisms? |
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5. What are two different common biological roles played by
irreversible inhibitors? |
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6. What advantage do lipid-based hormones have on other
types of hormones?
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7. Briefly explain why biologically-active molecules
rarely
if ever involve ionic bonds.
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8. What are two different things that can actually explain
what “junk DNA” is? |
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10. What are two ways that different isotopes of the same
element differ? |
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11. Give two different examples of allosteric effects
involving proteins. |
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12. What are the component parts of a lipid molecule?
Include numbers (how many?) for each component. |
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13. What are two different types of indirect enzyme
inhibition? |
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14. What is it specifically about pH that
affects the
workings of an enzyme (what does a change do to the enzyme itself)?
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15. Give two distinct and different features
that would be found in disaccharide synthase. |
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16. Give two different
circumstances under which a change in a codon
leads to no change in the function
of the coded protein. |
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17. On a curve showing the effects of temperature
on enzyme activity, the rates drop off both above and
below the optimum temperature. Explain why the rates drop
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BELOW
THE
OPTIMUM |
ABOVE
THE
OPTIMUM |
Long Answer.
Select and answer completely any four of the following
questions.
Note: if you answer more than four, only the first four
will be corrected.
Seven Points Each. Partial credit is possible.
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1. Using the numbers of bonds as a
guide, fill in the symbols for either Carbon, Hydrogen,
Nitrogen, or Oxygen. |
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These are boxes or circles with bonds drawn between
them. |
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2. In
the
graph
below
of
Michaelis-Menten Kinetics, explain why
the curve is doing what it’s doing at each marked point, in terms of the
enzyme molecules at work. |
Can't get graph right - marked at upslope, curve near top, flat top. |
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3. What are four classes of molecular function
largely performed by proteins? |
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4.
Name and give a
brief description
for the four levels of protein
structure. |
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5. Briefly explain, in terms of
density, the steps in the
“turning over” and freezing process that local lakes go through
in the late autumn. |
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6.
All for the most common
isotope – |
79.9014
Br
Bromine
# 35
Column 7
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How many
protons?
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How many
neutrons?
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Typical
ion form?
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How many
electrons?
(Radical
form)
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7.
For four functional organic molecule
groups, give
the
name, then show the arrangement of atoms in enough detail to demonstrate
completely how each group works. |
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Link to Answer
Key
BONUS QUESTIONS.
Answer as many or as few as you wish. You can't lose points on the rest of the
exam by getting these wrong. Partial credit is possible.
Avogadro's Number is 6 X 1023. What is it a
measure of?
Nuclear radiation varies in energy and penetration power
due to what other features? Three Points.
What are the two reasons, for Three Points each, for why
vegetable oil forms separate blobs or bubbles when mixed into water?
At most universities, which course is most likely to "weed
out" the many premed students? Three Points.
The starches in foods are fairly easy to digest because
they are constructed of easily-broken bonds. What advantage does that give to
the plants that make the starch? Three Points.
What is it about high-fiber food that makes it an effective
stool softener? Address molecule-level issues, for Three Points.
Why exactly is Sulfur an important component of many
proteins? Three Points.
What are two "unusual" aspects of the amino acids found in
living things, features that have to be addressed when explaining the origins of
Life's chemistry? Three Points each.
Why is it not reasonable that an enzyme would catalyze a
reaction equally in both directions? Three Points.
What might be the advantage of not lowering a low-grade
fever that has resulted from a bacterial infection? Be specific. Three Points.
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