SI Session 1

Which of the following is NOT a characteristic of water?

• Slows biological reactions

• Has a high specific heat

• Forms more hydrogen bonds in its solid form than liquid form

• All of its hydrogen bonds are the same strength

• Regularly donates and receives protons (H+)

Which feature of all living organisms is incorrectly matched to its definition?

• Irritability: ability to sense the world and adapt to it

• Motility: ability of an organism to relocate away from harmful stimuli

• Reproducibility: ability to generate entire organisms and evolve

• Motility: ability to generate molecular forces needed for cellular metabolite transportation

• None of the above

Which pair is correctly matched?

• ΔG<0; reverse reaction is favored

• ΔG>0; forward reaction is favored

• ΔG=0; no reaction

• ΔG<0; forward reaction is favored

• ΔG>0; reaction is at equilibrium

How would the body respond to acidosis?

• Hyperventilation to drive out CO2

• Hyperventilating to push in CO2

• Rebreathing to drive out CO2

• Rebreathing to push in CO2

• None of the above

Which of the following is true regarding buffers?

• Buffers are made of strong acids and strong bases

• Buffers are most effective at a pH near their pKa

• The orthophosphate buffer system is the main buffer system in humans

• Buffer systems do not follow Le Chatlier's Principle

• Buffers can only adjust to excess acid, not excess base

Which amino acid is capable of absorbing UV light?

• Tryptophan

• Isoleucine

• Methionine

• Arginine

• Glutamate

Which of the following is true regarding amino acids?

• Amino acids rarely exist as a Zwitterion

• Cysteine and Methionine are capable of forming disulfide bridges

• The majority of amino acids exist in the D form

• There are multiple achiral amino acids

• Amino acids are expected to be fully protonated at low pH

What is the isoelectric point of glutamate?

• 2.96

• 3.22

• 5.93

• 6.96

• 7.56

How many amino acid fragments would be expected after treating the following polypeptide with chymotrypsin:

H3N-TNFMSVPWLIYCSRF-COOH

• 1

• 2

• 3

• 4

• 5

Which of the following is NOT true?

• Amino acids build off the N-terminus

• One water molecule is lost for each peptide bond formed

• Two cysteines can form a cystine through a disulfide bridge

• Nonpolar amino acids are expected to be on the exterior of proteins

• Out of the aromatic amino acids, tryptophan can absorb the most UV light