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Practice Test:
Unit 1
Supplemental Instruction
Iowa State University
Leader: Landon
Course: Biology 212
Instructor: Essner Becraft
Date:
1.) Which of the following will NOT change a protein function:
a.) Phosphorylation of a protein
b.) Temperature of the environment
c.) Sequence of the amino acid composition
d.) pH of environment
e.) None of the above
2.) The structural level of a protein in which alpha helixes and beta sheets form are in the
A. Primary level
B. Secondary level
C. Tertiary level
D. Quaternary level
3.) Facilitated diffusion transport
A. requires membrane channel or carrier protein.
B. requires ATP hydrolysis.
C. requires H+ cotransport.
D. requires membrane potential.
E. requires osmosis.
4.) The Na+, K+ pump
A. transports Na+ by its electrochemical gradient.
B. transports K+ out of the cell.
C. does not require an energy input.
D. conformation and ion affinity are changed by phosphorylation.
E. is an example of facilitated diffusion
5.) Which of the following processes includes all others?
A. osmosis
B. diffusion of glucose down its concentration gradient
C. facilitated diffusion
D. diffusion of an ion down its electrochemical gradient
E. passive transport
6.) A _________ is formed by a specific electrostatic interaction between an electronegative atom and
a H atom.
A. Covalent bond
B. Peptide bond
C. Hydrogen bond
D. Ionic Bond
E. Hydrophilic-Hydrophobic attraction
Supplemental Instruction
1060 Hixson-Lied Student Success Center  294-6624  www.si.iastate.edu
7.) Molecules with both hydrophilic and hydrophobic domains are ______.
A. Heterophilic
B. Enantomers
C. Amphipathic
D. Sugars
8.) An Enzyme speeds up an reaction by ___________
A. decrease activation energy of a reaction.
B. increase the ΔG of a reaction
C. decrease the Δ G of a reaction
D. increase the activation energy of the reaction
9.) Polypeptide chains are always synthesized from _______ to _______.
a.) hydrophobic to hydrophilic
b.) N terminus to C terminus
c.) The amino group to carboxyl group
d.) Alpha helixes to beta sheets
e.) B and C
f.) None of the above
10.) If all of the H bonds in a protein structure were disrupted, which of the following folding levels
would be least affected?
a. Primary
b. Secondary
c. Tertiary
d. Quaternary
e. B and C
f. All of the above
11.) An amino acid does NOT contain
A. a carboxyl group
B. an amino group
C. a hydrogen atom
D. a phosphate group
E. a side chain
12.) Carboxyl groups are
meaning they
a. acidic, increase
b. acidic, decrease
c. basic, increase
d. basic, decrease
13.) Which of the following is least soluble in water?
a. Polar molecules
b. Nonpolar molecules
c. Ionic compounds
d. hydrophilic molecules
c. anions
the [H+] of a solution.