BMSC 200 UNIT 2 WATER, WEAK
INTERACTIONS AND BUFFERS
True or false: Water is the most abundant molecule in living organisms - Correct
Answers -true
What are the two roles of water? - Correct Answers -Passive
Active
What is the passive form of water - Correct Answers -biomolecules form in response to
interaction with water
What is the active form of water? - Correct Answers -Water is a participant in many
biochemical reactions
What two liquids have been found to be suitable for life - other than water? - Correct
Answers -Ammonia and formamide
Oxygen and hydrogen differ in: - Correct Answers -electronegativities
oxgeyn is more electronegative than hydrogen
oxygen - partially negative
hydrogen - partially positive
Water is a permanent? - Correct Answers -dipole
What is a dipole? - Correct Answers -A molecule that has two poles
The dipole of water molecules influences its ability to: - Correct Answers -- form
electrostatic interactions with charged molecules
- form hydrogen bonds
hydrogen bond - Correct Answers -weak attraction between a hydrogen atom and
another atom
- electrostatic interactions (electronegative and covalent)
What are the two common nitrogen bonders? - Correct Answers -Nitrogen and oxygen
, True or False
Oxygen and nitrogen can only serve as hydrogen bond donors - not accepters - Correct
Answers -False - donors and acceptors
Hydrogen bonds are:
a. weak
b. relatively strong
c. Very strong - Correct Answers -a - weak
_________ bonds are double the length of a covalent bond
a. carbon
b. nitrogen
c. oxygen
d. hydrogen - Correct Answers -d - hydrogen
Strength of hydrogen bonds - Correct Answers -depends on geometry
a. parallel
b. anti parallel
Each water molecule can donate and accept how many hydrogen bonds?
a. 4
b. 1
c. 2
d. 3 - Correct Answers -c. 2
each water molecule has the potential to participate in how many hydrogen bonds with
other water molecules?
a. 1
b. 2
c. 3
d. 4 - Correct Answers -d. 4
Each molecule participates in an average of how many hydrogen bonds in dynamic
flickering clusters?
a. 2.4
b. 3.4
c. 3.8
d. 2.8 - Correct Answers -b. 3.4
The forces that hold the non-polar regions of the molecule together are called
a. hydrophilic interactions
b. hydrophobic interactions
c. amphiphatic interactions - Correct Answers -c. hydrophobic
Most biomolecules
a. hydrophilic
INTERACTIONS AND BUFFERS
True or false: Water is the most abundant molecule in living organisms - Correct
Answers -true
What are the two roles of water? - Correct Answers -Passive
Active
What is the passive form of water - Correct Answers -biomolecules form in response to
interaction with water
What is the active form of water? - Correct Answers -Water is a participant in many
biochemical reactions
What two liquids have been found to be suitable for life - other than water? - Correct
Answers -Ammonia and formamide
Oxygen and hydrogen differ in: - Correct Answers -electronegativities
oxgeyn is more electronegative than hydrogen
oxygen - partially negative
hydrogen - partially positive
Water is a permanent? - Correct Answers -dipole
What is a dipole? - Correct Answers -A molecule that has two poles
The dipole of water molecules influences its ability to: - Correct Answers -- form
electrostatic interactions with charged molecules
- form hydrogen bonds
hydrogen bond - Correct Answers -weak attraction between a hydrogen atom and
another atom
- electrostatic interactions (electronegative and covalent)
What are the two common nitrogen bonders? - Correct Answers -Nitrogen and oxygen
, True or False
Oxygen and nitrogen can only serve as hydrogen bond donors - not accepters - Correct
Answers -False - donors and acceptors
Hydrogen bonds are:
a. weak
b. relatively strong
c. Very strong - Correct Answers -a - weak
_________ bonds are double the length of a covalent bond
a. carbon
b. nitrogen
c. oxygen
d. hydrogen - Correct Answers -d - hydrogen
Strength of hydrogen bonds - Correct Answers -depends on geometry
a. parallel
b. anti parallel
Each water molecule can donate and accept how many hydrogen bonds?
a. 4
b. 1
c. 2
d. 3 - Correct Answers -c. 2
each water molecule has the potential to participate in how many hydrogen bonds with
other water molecules?
a. 1
b. 2
c. 3
d. 4 - Correct Answers -d. 4
Each molecule participates in an average of how many hydrogen bonds in dynamic
flickering clusters?
a. 2.4
b. 3.4
c. 3.8
d. 2.8 - Correct Answers -b. 3.4
The forces that hold the non-polar regions of the molecule together are called
a. hydrophilic interactions
b. hydrophobic interactions
c. amphiphatic interactions - Correct Answers -c. hydrophobic
Most biomolecules
a. hydrophilic
