Biochemistry : Identifying Specific Protein Structures
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Example Questions
Example Question #61 : Identification By Structure
Primary protein structure is primarily held together by what type of bond?
Van der waals interactions
Hydrogen bond
Peptide bond
Phosphodiester bond
Ionic bond
Peptide bond
Primary protein structures are composed of amino acids linked together by peptide bonds. Secondary protein structures are held together by hydrogen bonds. Phosphodiester bonds can be found between sugar and phosphate groups in the backbone of DNA.
Example Question #31 : Identifying Specific Protein Structures
Why is the tertiary structure of a protein always conserved, even more so than the primary structure?
The primary and tertiary structure of a protein are equally conserved
The bonds holding the tertiary structure are stronger than those of the primary structure
The primary structure is more conserved than the tertiary structure
Tertiary structure is more closely associated with the sequence of the protein
Tertiary structure is more closely associated with the protein's function
Tertiary structure is more closely associated with the protein's function
The primary structure of a protein deals with its sequence while the tertiary structure deals with the folding of the protein. The folding of the protein is what determines its function, and because this is important in maintaining the life of organisms, the tertiary structure must be heavily conserved.
Example Question #63 : Identification By Structure
Which of these are negatively charged amino acids at pH 7?
I. Aspartic acid
II. Glutamic acid
III. Lysine
IV. Arginine
IV only
I, III, and IV
I, II, and III
III and IV
I and II
I and II
Amino acids are classified based on their charged (polar groups) at neutral pH (pH=7).Lysine (Lys, K), arginine (Arg, R) and histidine (His, H) are positively charged at neutral ph (pH=7), while aspartate and glutamate are negatively charged.
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