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chem 104 final

chaper 22

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.
Created by: anel