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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

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162 Which element is considered the backbone of organic molecules?

A: Oxygen

B: Hydrogen

C: Carbon

D: Nitrogen

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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

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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

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165 Which property allows water to rise in plants against gravity?

A: Cohesion

B: Adhesion

C: Surface tension

D: All of the above

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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

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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

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168 What property of water is primarily due to hydrogen bonding?

A: High density

B: Low boiling point

C: Cohesion

D: Low heat capacity

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169 What is the shape of a water molecule?

A: Linear

B: Bent

C: Tetrahedral

D: Trigonal planar

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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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