Question : 41) One heavy metal that can cause denaturation of a : 1363048

 

41) One heavy metal that can cause denaturation of a protein is

A) silver.

B) sodium.

C) barium.

D) iron.

E) calcium.

42) Heavy metals denature proteins by

A) releasing amino acids.

B) disrupting hydrophobic interactions.

C) changing the pH of the protein solution.

D) changing the temperature of the protein solution.

E) disrupting disulfide bonds.

43) An acid can denature a protein by

A) agitating the protein chains.

B) disrupting hydrogen bonds between R groups chains.

C) disrupting hydrophobic interactions within a protein chain.

D) removing helping molecules such as heme.

E) breaking disulfide bridges.

44) Glycine is the only naturally occurring amino acid that is

A) negatively charged.

B) positively charged.

C) neutral.

D) in the L- form.

E) achiral.

45) In a typical amino acid zwitterion, the carboxylate end is

A) positively charged.

B) negatively charged.

C) neutral.

D) soluble in a nonpolar solvent.

E) attached to an amine.

46) Methionine is an amino acid that contains

A) a sulfur atom.

B) a chlorine atom.

C) a sodium atom.

D) a phenyl ring.

E) a heterocyclic ring.

47) Disulfide bonds in a protein chain connect 

A) an amine and a carboxylic acid group.

B) an alcohol and a carboxylic acid group.

C) tryptophan and alanine residues.

D) two cysteine residues.

E) two asparagine residues.

48) The side chain for histidine is classified as a __________ R group.

A) basic

B) neutral

C) acidic

D) nonpolar

E) polar

49) At a pH > 9, the zwitterion of glycine will have 

A) a net positive charge.

B) a net negative charge.

C) an overall charge of zero.

D) low solubility in water.

E) a negative charge on the nitrogen.

50) At a pH < 5, the zwitterion for alanine (pI = 6) will have A) a net positive charge. B) a net negative charge. C) an overall charge of zero. D) low solubility in water. E) a negative charge on the carboxyl group. 51) What is the structural formula of glutamic acid (pI = 3.2) at pH = 1? A) B) C) D) E) 52) Consider a mixture of the amino acids lysine (pI = 9.7), tyrosine (pI = 5.7), and glutamic acid (pI = 3.2) at a pH 5.7 that is subjected to an electric current.  __________ will migrate towards the positive electrode(+). A) Lysine B) Tyrosine C) Glutamic acid D) All of the amino acids 53) Consider a mixture of the amino acids lysine (pI = 9.7), tyrosine (pI = 5.7), and glutamic acid (pI = 3.2) at a pH 5.7 that is subjected to an electric current.  __________ will remain stationary. A) Lysine B) Tyrosine C) Glutamic acid D) All of the amino acids 54) A basic amino acid has an R group that contains A) an amine group. B) a carboxyl group. C) a methyl group. D) an alcohol group. E) a thiol group. 55) Enkephalins, naturally produced opiates in the body, are found in A) muscles and bone tissue. B) brain and kidney tissue. C) thalamus and spinal cord tissue. D) heart and lung tissue. E) pancreas and liver tissue.    

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