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Test № 1. Amino Acids & Proteins.
1) Сhoose the correct answer.
1. The type of bond that forms between amino acids in order to eventually form a protein is
called a....
A. Glycosidic linkage
B. Hydrogen bond
C. Ionic bond
D. Peptide bond
E. Hydrous bond
2. The formation of a protein or polypeptide relies on linking amino acids by way of....
A. Dehydration synthesis
B. Hydrolysis
C. Hydration
D. Polar covalent bonding
3.
In the typical amino acid shown below, "R" represents:
A. One atom of either Rubidium or Ruthenium
B. Another amino group or carboxyl group, depending on the amino acid
C. A variable group, different in each of the 20 amino acids
D. R is none of the above.
4. When amino acids are bonded into a single long chain, the resulting product is considered
to be a protein's....
A. Primary Structure
B. Secondary Structure
C. Tertiary Structure
D. Quaternary Structure
5. A chain of amino acids, which is then twisted into an Alpha Helix, or 'folded' into a Beta
Pleat, is considered a protein's....
A. Primary Structure
B. Secondary Structure
C. Tertiary Structure
D. Quaternary Structure
6. A chain of amino acids, that has been twisted or folded, sometimes folds or twists upon
itself even more, due to attractions between amino acids. This is an example of....
A. Primary Structure
B. Secondary Structure
C. Tertiary Structure
D. Quaternary Structure
7. If a protein consists of several different polypeptides, each with a complex threedimensional shape, held together by chemical bonds, it is considered to have a fairly complex
____________ structure.
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
8. Which of the following is NOT true about Proteins?
A. They are insoluble in water due to their size & heavy molecular mass.
B. They are the building block of many mammalian tissues, such as muscle or bone
C. They are stored as a nutrient, since they yield more energy than lipids or carbs.
D. They are useful in cells as both structural components & in chemical reactions.
9. Any protein that can act as a catalyst for certain cellular chemical reactions is considered
to be a(n)....
A. Enzyme
B. Antigen
C. Antibody
D. Transport protein
10. Proteins embedded in the cellular membrane are often used for many functions. Which
of these is NOT a function of membrane proteins?
A. Cell to cell adhesion
B. Receptor site for hormone
C. Transport of materials in/out of the cell
D. Cell identity or recognition
E. Cell nutrition
11. A protein produced by a white blood cell in response to some foreign element (bacterium,
virus) is called a(n)....
A. Enzyme
B. Antigen
C. Antibody
D. Transport protein
12. Bacteria or viruses have proteins on their surface that our white blood cells recognize as
foreign or 'non-self'. These proteins are called....
A. Enzymes
B. Antigens
C. Antibodies
D. Transport Proteins
13. The Sodium - Potassium pump is an excellent example of a(n)....
A. Enzyme
B. Antigen
C. Antibody
D.Transport Protein
14.
The diagram below is showing a reaction between three amino acids. When the reaction
is complete, the resulting bond and molecule will be, respectively:
A. Pepsin, enzyme
B. Peptide, polypeptide
C. Amide, protein
D. Peptide, dipeptide
15.
The functional group shown below is a(n):
A. Carboxyl Group
B. Hydroxyl Group
C. Amino Group
D. Carbonyl Group
E. Sulfhydryl Group
16.
The functional group shown below is a(n)...
A. Carboxyl Group
B. Hydroxyl Group
C. Amino Group
D. Carbonyl Group
E. Sulfhydryl Group
17.
Several amino acids have the functional group below. It is a(n)....
A. Carboxyl Group
B. Hydroxyl Group
C. Amino Group
D. Carbonyl Group
E. Sulfhydryl Group
2) Аnswer the questions
1. Define amino acids.
2. List the physical properties of amino acids.
3. Define proteins.
4. What elements are included in protein molecules?
5. What are the primary, secondary, tertiary and quaternary structures of protein molecules?
6. Define the denaturation process.
7. List the functions of proteins in the human body.