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chem 104 final
chaper 22
Question | Answer |
---|---|
Which of the following amino acids has iodine atoms in its structure? | Thyroxine |
Which of the following is a protein associated with the movement of muscles? | Actin |
In the tertiary structure of proteins which amino acid is involved in forming covalent bonds? | Cystine |
Which of the following is a type of secondary structure? | both a and b,(think of alpha helix and beta pleated sheet.) |
Which of the following is present in fetal hemoglobin but not adult hemoglobin? | -chains- gamma chains. |
Which of the following is a allosteric protein? | Hemoglobin. |
Which of the following is associated with the quaternary structure of proteins? | The interaction of protein subunits. |
How many atoms form the backbone of the repeat unit of a protein? | 6 atoms. |
What determines the characteristics of an amino acid? | The identity of its side chain. |
Sickle cell anemia is the result of how many changes in each beta-chain of normal hemoglobin? | 1 change. |
Which of the following explains the unusually high melting points of amino acids? | Their existence as zwitterions. |
Secondary Structure is associated with which of the following? | Hydrogen bonding within the backbone. |
Which of the following is true of the atoms in the backbone unit of a protein? | They are all in the same plane. |
Which of the following defines the primary structure of proteins? | The sequence of the amino acids. |
Protein synthesis proceeds in which direction? | From the N-terminus to the C-terminus. |
What type of chemical reaction is involved in the formation of disulfide bonds from thiols. | Oxidation. |
Which of the following proteins is a hormone? | Insulin. |
What type of chemical reaction is involved in the conversion of disulfide bonds to thiols? | Reduction. |
Which of the following is true of proteins? | The acid/base properties of a protein depend on the identity of its side chains. |
Which of the following is true of the isoelectric point of amino acids? | It is the pH at which an amino acid has equal numbers of positive and negative charges. |
When will a protein have the lowest solubility? | at its isoelectric point. |
Which of the following is true of integral membrane proteins? | The outer surface involves primarily Hydrophobic groups and most of the hydrophilic groups must turn inward. |
Which of the following pairs of amino acids has hydrophobic interactions? | Leucine and Phenylalanine. |
Which of the following is a structural protein? | Collagen. |
How many different amino acids are commonly found in proteins? | 20 amino acids |
Having the gene for sickle cell hemoglobin gives an individual enhanced immunity against which of the following? | Malaria. |
What is the name for proteins which assist other proteins in attaining their correct secondary and tertiary structures? | Chaperones. |
Proteins are associated with which of the following functions? | All of these. Structure, Catalysts, movement, transport,hormones,Protection,storage,regulation. |
How many protein chains make up hemoglobin? | 4 chains. |
Which of the following correctly describes the relationship between the primary structure of a protein and protein function? | Changing one amino acid may or may not affect protein function. |
In which of the following is the amino nitrogen also part of the side chain? | Proline |
Why is 70% ethanol rather than 95% ethanol used in sterilizing skin before injections? | 70% ethanol kills bacteria by penetrating them and coagulating their proteins. |