A student observes that when an unknown molecule is added to water, it forms
micelles, which under the right conditions can form membranes. What can this
student infer about this phenomenon? - ANSWER The unknown molecule is
amphipathic.
Choose the functional group that CANNOT form a hydrogen bond with water. -
ANSWER aromatic ring
Gastroesophageal reflux disease is a common example of a pathological change
in: - ANSWER pH level
How many neighbouring water molecules are hydrogen-bonded on average to
one water molecule in a sample of pure water? - ANSWER 3
In a typical cell, the water content is about: - ANSWER 70%
Oxygen is an electronegative atom. That means that in a molecule of water the:
- ANSWER electrons of covalent bonds spend more time near the oxygen
atom than near the hydrogen atoms.
The protein that interacts with both water and the hydrophobic regions of the
membrane is considered: - ANSWER amphipathic.
Typical van der Waals energies are about: - ANSWER 2-4 kJ/mol.
What amino acids are most likely to be found in the core of a water-soluble
globular protein? - ANSWER nonpolar
What factor does NOT affect electrostatic interaction according to Coulomb's
law? - ANSWER a change in entropy if the interaction occurs
What is the [A -]/[HA] ratio when a weak acid is in a solution one pH unit
above its p K a? - ANSWER 10:1
micelles, which under the right conditions can form membranes. What can this
student infer about this phenomenon? - ANSWER The unknown molecule is
amphipathic.
Choose the functional group that CANNOT form a hydrogen bond with water. -
ANSWER aromatic ring
Gastroesophageal reflux disease is a common example of a pathological change
in: - ANSWER pH level
How many neighbouring water molecules are hydrogen-bonded on average to
one water molecule in a sample of pure water? - ANSWER 3
In a typical cell, the water content is about: - ANSWER 70%
Oxygen is an electronegative atom. That means that in a molecule of water the:
- ANSWER electrons of covalent bonds spend more time near the oxygen
atom than near the hydrogen atoms.
The protein that interacts with both water and the hydrophobic regions of the
membrane is considered: - ANSWER amphipathic.
Typical van der Waals energies are about: - ANSWER 2-4 kJ/mol.
What amino acids are most likely to be found in the core of a water-soluble
globular protein? - ANSWER nonpolar
What factor does NOT affect electrostatic interaction according to Coulomb's
law? - ANSWER a change in entropy if the interaction occurs
What is the [A -]/[HA] ratio when a weak acid is in a solution one pH unit
above its p K a? - ANSWER 10:1
