Download Quiz 15

Quiz 15
Name___________________________
1. Which of the following are advantages of constructing a protein of many amino acid monomers.
A) A no-longer-needed protein can be broken down and a different protein constructed from the same
monomers.
B) An animal can eat a plant protein, break it down to amino acids and use these to construct its own
proteins.
C) A myriad of proteins can be constructed from the 20 amino acids by simply varying their sequence.
D) A and C
E) A, B and C
2. At which structural level(s) one can alter the function of a protein:
A) only primary
B) only secondary
C) only tertiary
D) only quaternary
E) primary, secondary, tertiary, and quaternary
3. For this pair of items, choose the option that best describes their relationship.
(A) The probability that amino acids with polar side chains are hydrophobic.
(B) The probability that amino acids with side chains containing an -OH group are
hydrophilic.
A) Item (A) is greater than item (B).
B) Item (A) is less than item (B).
C) Item (A) is exactly or very approximately equal to item (B).
D) Item (A) may stand in more than one of the above relations to item (B).
4. All of the following contain amino acids EXCEPT
A) hemoglobin.
B) cholesterol.
C) antibodies.
D) enzymes.
E) aquaporins.
5. The bonding of two amino acid molecules to form a larger molecule requires which of the
following?
A) removal of a water molecule
B) addition of a water molecule
C) formation of an ionic bond
D) formation of a peptide bond
E) both A and D
6. Upon chemical analysis, a particular polypeptide was found to contain 300 amino acids. How many
mRNA nucleotides were translated to create this protein?
A) 300
B) 900
C) 100
D) 98
E) 97
7. Which type of interaction stabilizes the alpha helix and the beta pleated sheet structures of proteins?
A) hydrophobic interactions
B) nonpolar covalent bonds
C) ionic bonds
D) hydrogen bonds
E) peptide bonds
8. A hydrophilic R-group of an amino acid in hemoglobin would NOT be attracted to:
A) the water molecules surrounding hemoglobin.
B) a hydrophobic amino acid R group of hemoglobin.
C) a charged amino acid R group of hemoglobin.
D) a polar amino acid R group of hemoglobin.
E) an amino acid R group of hemoglobin containing an –OH group.
9. The structural level of a protein least affected by a disruption in hydrogen bonding is the
A) primary level.
B) secondary level.
C) tertiary level.
D) quaternary level.
E) All structural levels are equally affected.
10. Humans can produce the amino acid alanine from other components in the body, but valine cannot
be produced in the human body. From this you can conclude:
A) Alanine is a non-essential amino acid
B) Valine is a non-essential amino acid
C) Valine is an essential amino acid
D) A and B
E) A and C