Protein Structure Quiz
1. Polypeptides are conformationally restricted because
PEPTIDE BONDS HAVE DOUBLE BOND CHARACTER AND OF STERIC HINDRANCE (THE FACT THAT TWO ATOMS CANNOT BE IN THE SAME PLACE AT THE SAME TIME) DUE TO AMINO ACID SIDE CHAIN CLASHES
2. Proteins often have regions that show specific, coherent patterns of folding or function. These regions are called
DOMAINS
3. The shape of a folded protein is determined by
THE SEQUENCE OF ITS AMINO ACIDS
4. An enzyme that has become nonfunctional due to the loss of its three-dimensional structure is said to be
DENATURED
5. Which of the following best represents the backbone arrangement of two peptide bonds? (CA = alpha carbon, N = nitrogen, C = carbonyl carbon)
CA – C – N – CA – C – N
6. In an alpha helix, the coiling is stabilized by
HYDROGEN BONDING OF THE N – H GROUPS ON ONE AMINO ACID AND THE C == O GROUPS ON ANOTHER
7. Ionic bonds are a part of a protein’s tertiary structure and can occur between
GLUTAMIC ACID AND ARGININE
8. Where would the leucine side chain most likely be found in a protein dissolved in water?
IN THE INTERIOR OF THE PROTEIN IN CONTACT WITH NONPOLAR SIDE CHAINS
9. Quaternary structure of proteins refers to
THE NUMBER AND KIND OF POLYPEPTIDE SUBUNITS THE PROTEIN HAS
10. Which of the following statements about the primary structure of a protein is not true?
IT MAY BE BRANCHED