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Essential Biochemistry - Chemistry Of Proteins (Section 5)

1
What is the main difference between glucogenic and ketogenic amino acids?
Answer
(A)
Their ability to be converted into glucose or ketone bodies.
2
Which of the following amino acids is known as an aromatic group?
Answer
(C)
Phenylalanine
3
Which level of protein structure is described by the sequence of amino acids in a polypeptide chain?
Answer
(A)
Primary
4
Which of the following are examples of proteins having a quaternary structure?
Answer
A
C
D
5
Which amino acid is often found in the hydrophobic regions of a protein?
Answer
(C)
Leucine
6
What type of amino acid side chain is most likely to be found on the exterior of a water-soluble protein?
Answer
(B)
Polar, charged
7
Which is not a non-covalent bond involved in protein structure?
Answer
(D)
Peptide bond
8
What is the function of a chaperone protein?
Answer
(C)
To assist in the proper folding of other proteins.
9
Which of the following amino acid is exclusively ketogenic?
Answer
(A)
Leucine
10
What is the role of the amino group (-NH2) in an amino acid?
Answer
(B)
To contribute to the amino acid's basic properties
11
Which of the following amino acids is most likely to be found in the interior of a water-soluble protein?
Answer
(C)
Leucine
12
What are the primary structures of proteins?
Answer
(A)
Sequence of amino acids
13
In beta-pleated sheets, the hydrogen bonds are between:
Answer
(B)
NH and CO groups of different chains
14
Which of the following is NOT a type of secondary structure?
Answer
(D)
Amino acid sequence
15
What is the isoelectric point (pI)?
Answer
(A)
The pH at which a molecule has a net charge of zero.
16
Which amino acid side chain contributes to the unique properties of proteins?
Answer
(D)
The R group
17
Which of the following amino acids are nonpolar?
Answer
A
B
C
18
What are the two main secondary structures found in proteins?
Answer
(A)
Alpha-helix and beta-sheet
19
What type of bond is responsible for the primary structure of a protein?
Answer
(B)
Peptide bonds
20
What is the function of a peptide bond?
Answer
(B)
To link amino acids in a polypeptide chain
21
Which amino acid contains an imidazole ring?
Answer
(C)
Histidine
22
What does it mean for an amino acid to be 'essential'?
Answer
(B)
It is required in the diet.
23
Which amino acid plays a crucial role in forming disulfide bonds?
Answer
(A)
Cysteine
24
Which of the following is an example of a globular protein?
Answer
(C)
Myoglobin
25
Which reagent is used for precipitation of proteins?
Answer
(D)
Organic solvents
26
Glycine is used for synthesis of the following, except:
Answer
(C)
Purine
27
Which of the following is a characteristic of all amino acids?
Answer
(B)
They all contain a carboxyl group