Topic 1.1 Structure of Water and Hydrogen Bonding

What is the chemical formula of water?

• H2O

• CO2

• CH4

• O2

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A hydrogen bond is a weak attraction between:

• Two protons

• A hydrogen atom and an oxygen atom in different molecules

• Two oxygen atoms

• Two carbon atoms

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The structure of DNA is best described as:

• A single linear strand

• A double helix

• A triple helix

• A branched structure

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How do two strands of DNA bind to create a double helix?

• Through covalent bonds between the nitrogenous bases

• Through hydrogen bonds between the nitrogenous bases

• Through hydrogen bonds between the sugar molecules

• Through covalent bonds between the deoxyribose sugars

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Which of the following describes the role of R groups in proteins?

• They determine the DNA sequence

• They provide energy to the cell

• They contribute to the protein's specific structure and function

• They facilitate hydrogen bonding between nucleotides

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Which of the following properties of water is a result of hydrogen bonding?

• High heat capacity

• Low surface tension

• Low specific heat

• Low heat of vaporization

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What property of water gives rise to its ability to dissolve various substances?

• High density

• Low polarity

• Low heat capacity

• High polarity

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Water's polarity is primarily due to:

• Unequal sharing of electrons between hydrogen and oxygen

• Equal sharing of electrons between hydrogen and oxygen

• The presence of only oxygen atoms in the water molecule

• The absence of hydrogen atoms in the water molecule

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Adhesion and cohesion in water are due to:

(PICK 2)

• Hydrogen bonds between water molecules

• Covalent bonds between water molecules

• Hydrogen bonds between a water molecule and a different molecule

• Ionic bonds between water molecules

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Capillary action, which allows water to move against gravity up a narrow tube, is primarily driven by:

• Cohesion and adhesion

• Hydrophobic interactions

• Ionic bonding

• Hydrogen bonding

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