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161
What is the primary role of nitrogen in living organisms?
A:
Energy storage
B:
Protein synthesis
C:
Oxygen transport
D:
DNA replication
162
Which element is considered the backbone of organic molecules?
A:
Oxygen
B:
Hydrogen
C:
Carbon
D:
Nitrogen
163
How does water’s polarity influence its ability to dissolve substances?
A:
Polar substances dissolve easily
B:
Nonpolar substances dissolve easily
C:
All substances dissolve equally
D:
None dissolve
164
What effect does temperature have on hydrogen bonds in water?
A:
Decreases bond strength at high temperatures
B:
Increases bond strength at high temperatures
C:
No effect
D:
Bonds become permanent
165
Which property allows water to rise in plants against gravity?
A:
Cohesion
B:
Adhesion
C:
Surface tension
D:
All of the above
166
What happens to water molecules as they freeze?
A:
They become denser
B:
They form a crystalline structure
C:
They become nonpolar
D:
They evaporate
167
How does hydrogen bonding affect the boiling point of water?
A:
Lowers the boiling point
B:
Raises the boiling point
C:
No effect
D:
Creates vapor pressure
168
What property of water is primarily due to hydrogen bonding?
A:
High density
B:
Low boiling point
C:
Cohesion
D:
Low heat capacity
169
What is the shape of a water molecule?
A:
Linear
B:
Bent
C:
Tetrahedral
D:
Trigonal planar
170
What type of bond exists between the hydrogen and oxygen atoms in water?
A:
Ionic bond
B:
Covalent bond
C:
Hydrogen bond
D:
Van der Waals force
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