Exam 2: Water

Basic solutions form when chemicals are dissolved in water and remove

Which is not a proper way to form a hydrogen bond? The symbol ʺRʺ represents a general organic group. The hydrogen bonding is represented by dashed lines.)

Which of the following weak interactions is not an electrostatic interaction?

Which would you expect to be most soluble in water?

Intracellular buffers include

London dispersion forces are attractive forces that arise due to

Which statement below is true about the relative lifetime of a hydrogen bond, compared to the rate of waterʹs ionization to hydroxide ions and hydronium ions?

An intermediate formed by the enzyme glutamine synthetase, gamma-glutamyl phosphate, is rapidly hydrolyzed by water if the enzyme is not around to protect it.

Hydrogen bonds can occur when hydrogen is covalently bonded to atoms like nitrogen and oxygen. What property of nitrogen and oxygen is important for this?

Which molecule or ion below is amphipathic?

Since the pK_a of acetic acid is 4.8, it can be used to prepare a buffer to maintain physiological pH.

Hydrophobic interactions are sometimes called ʺbondsʺ, because each one is as strong as a covalent bond.

The abundance of water in the cells and tissues helps to minimize temperature fluctuations. This is due to what property of water?

Which is true about hydrogen bonding for biological molecules?

Micelles are stabilized in water by interactions of nonpolar molecules with each other.

Which substance do you expect to be most soluble in water?

The hydrogen bonding between water molecules in ice gives water an unusually low melting point compared to other molecules of similar size and molecular weight that cannot form hydrogen bonds.

The Henderson-Hasselbalch equation can be used to calculate

A hydrated potassium ion is surrounded by a shell of water molecules oriented primarily with their oxygen atoms toward the potassium ion.

Attractions of oppositely charged functional groups of proteins are sometimes called .