BMB401 Exam I Exam ID Page Practice LOGARITHMS THAT MIGHT BE USEFUL log 0 01 2 log 0 1 1 log 1 0 log 2 0 30 log 3 0 48 log 7 log 8 log 9 log 10 log 100 ANTILOGS THAT MAY BE USEFUL 0 84 0 90 0 95 1 0 2 0 log 4 0 60 anti log 1 10 anti log 2 100 anti log 3 1000 anti log 1 1 10 anti log 2 1 100 anti log 3 log 5 0 70 log 6 0 78 1 1000 pKas of Amino Acid Functional Groups Amino Acid 1 and 3 letter Codes A C D E F G H I K L Ala Cys Asp Glu Phe Gly His Ile Lys Leu Alanine Cysteine Aspartate Glutamate Phenylalanine Glycine Histidine Isoleucine Lysine Leucine M N P Q R S T V W Y Met Asn Pro Gln Arg Ser Thr Val Trp Tyr Methionine Asparagine Proline Glutamine Arginine Serine Threonine Valine Tryptophan Tyrosine Unit Conversion nM 10 9 molar M 10 6 molar mM 10 3 molar US13 1 BMB401 Exam I ID Page Practice Exam 2 1 Please choose the true statement a The four most prevalent elements in living things are hydrogen carbon oxygen and phosphorus b The major attractive force that is formed between two methyl groups is fixed dipole dipole c The attractive bond energy between two ions is directly proportional to the magnitude of the charge on the ions d Hydrophobic interactions arise because of charge repulsion between the solution and the hydrophobic solute 2 Please choose the true statement a Our bodies represent closed systems b The buffering capacity of a buffering system is greatest at the pKa of the conjugate acid c Each buffer has one optimal buffering range d The prominent buffering system of the cell is the carbonic acid bicarbonate buffering system 3 The First Law of Thermodynamics says that the energy of any system is constant True False 4 Please choose the true statement a The entropy of the universe always decreases b S of the universe must always be a negative number c G represents the free energy of a system in aqueous solution at pH 7 and at standard temperature and pressure d All the above are true 5 Please choose the true statement a Glycine is in the L configuration but proline is not because it is an imide b Aspartate is a basic amino acid because its guanidinium group can pick up a proton at physiologic pH to become protonated c Of the 20 amino acids found in proteins those classified as basic have a full formal positive charge at physiologic pH d All the above are true e Only a and c are true 6 Please choose the correct groupings where P protein C carbohydrates N nucleic acids and L Lipids a Form covalently linked polymeric structures P C N L b Found in the cell membrane either as primary constituents of the membrane itself or as surface structures P C L c Provide energy either through catabolism or through hydrolysis of high energy bonds P C N L d All the above are true e Only b and c are true 7 The pI of a protein is the pH at which the protein has no charge as all amino acid side chains and both the terminal alpha carboxy and amino groups are neutral in charge True False 8 The nitrogenous bases in DNA are Cytosine Guanine Thymine and Uracil True False 9 Please choose the true statement such that an ionic salt bridge can be formed between the side chains of the amino acids listed at the stated pH a Arginine and Histidine at pH 10 b Histidine and Aspartate at pH 3 c Glutamine and Histidine at pH 8 d Proline and Lysine at pH 7 e None of the above can form a salt bridge at these described pH values US13 BMB401 Exam I ID Page Practice Exam 3 10 Two ions in an ionic bond in H2O have a bond energy of 5 9 kJmol 1 Which of the following is true a In hexane at the same distance this bond energy would have a greater value than 5 9 and be positive b In hexane at the same distance this bond energy would have a greater value than 5 9 and be negative c If these two ions were left in solution but somehow moved further apart the bond energy between them would become more negative a higher value than 5 9 and still negative d If the one of these ions were switched to have an opposite charge of the same magnitude and both ions remained in water and at the same distance the bond energy would be 5 9 kJmol 1 e Only a c and d are true f Only b and d are true 11 Please choose the true statement a The pI of a protein is the pH at which the protein as a whole is neutral in charge b The pI is the pH at which all of the amino acids comprising that protein are neutrally charged c The pI of a protein is the pH at which all of its amino acid R groups are deprotonated d There are no true answers here 12 Select the correct statement to finish this sentence correctly In describing the genetic code a codons in the transcript are overlapping sets of 3 bases corresponding to 1 amino acid b one codon can correspond to more than one amino acid c one amino acid can be coded by two or more codons d each of the 64 possible combinations of three bases corresponds to a particular amino acid e Both b and d are true f Both c and d are true 13 Which of the following is NOT one of the weak non covalent forces frequently involved in biomolecular interactions a Disulfide bonds b Hydrophobic interactions c Ionic interactions d Hydrogen bonds 14 Sickle cell anemia Hs confers a survival advantage in persons a Homozygous for Hs b b Heterozygous for Hs c Either Homozygous or Heterozygous for Hs d This allele does not confer any advantage 15 Which of the following is FALSE a In aqueous solution proteins are surrounded by a hydration shell of water molecules b In aqueous solution proteins form hydrogen bonds with water molecules c In aqueous solution polar amino acids are most commonly on the outside of a protein and interact with the solution d In a lipid environment and in an aqueous environment the amino acids with hydrophobic side chains are most commonly buried on the inside of the protein rather than the outside 16 Please choose the true statement a The normal 3 dimensional structure of a protein is called its primary structure b A denatured protein is one that has become proteolyzed c Denatured proteins generally do not show loss of normal function d Denaturing agents can often disrupt the weak non covalent interactions in a protein e Only a b and c are true US13 BMB401 Exam I ID Page Practice …
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