The structure of a protein results from the folding ofthe pleated sheets or helices.a. primary c. tertiaryb. secondary d. quaternary

In a new protein structure you just solved by X-ray crystallography, you found a very long a-helix composed of 36 amino acids. What is the length of this helix? O A. 5.4 nm O B. 0.54 nm O C. 0.36 nm D. 36 nm E. 54 nm

A friend, while frying some eggs, points to the change in the egg white (which contains a protein called albumin) and explains that if the conformation of a protein changes, it will no longer have the same properties and will lose its ability to function. Do you agree or disagree with this statement?

Which of the following statement(s) about proteins is true? a. proteins are polymers of amino acids chemically joined by dipeptide bondsb. proteins have 4 functional levelsc. proteins can be irreversibly denaturedd. fibrous proteins are functional and globular proteins are structurale. none of the above

Which of the following statements is FALSE? Select one: a. Secondary structure of a protein determines how it folds up into a unique three dimensional structure. b. Three dimensional structure of a protein determines the function of a protein. c. Primary structure of a protein determines how it folds up into a unique three dimensional structure. d. Amino acid sequence is absolutely important for a particular protein.

Beta-sheets are roughly planar structures, in which the backbone hydrogen bonding pattern defines the plane. Where are the side chains in a sheet? Select one: a. The side-chains are on the outside of the sheet. O b. The side-chains are in the plane of the sheet, with residues from one chain on one side of the sheet, and residues from the other chain being on the other side. The side-chains do not have a consistent pattern. d. The side-chains are perpendicular to the plane of the sheet, with residues from one chain being above and residues from the other being below the plane of the sheet. C. e. The side-chains are perpendicular to the plane of the sheet, with residues from each chain alternating between above and below the plane of the sheet. O f. The side-chains are in the plane of the sheet, with residues from each chain alternating being on one side or the other of the sheet. g. Beta-sheets are rarely observed in proteins.

Two amino acids of the standard 20 contain sulfur atoms. They are: a. cysteine and serine. b. cysteine and threonine. c. methionine and cysteine d. methionine and serine e. threonine and serine.

Why is knowledge of a protein’s structure important?

Which of the following are involved in protein secondary structure? select one or more : a.  van der waal forces  b. Disulfide bridges  c. Hydrogen bonds  d. Peptide bonds

The largest number of amino acids found in proteins are ________ A. Polar B.hydrophobic C.hydrophilic meaning that they tend to be _______ water. A. Attracted to B. Repelled from