AP Biology Final Exam

Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?

• water's change in density when it condenses

• water's ability to dissolve molecules in the air

• the release of heat by the formation of hydrogen bonds

• the absorption of heat by the breaking of hydrogen bonds

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following categories contains all the rest?

• disaccaride

• starch

• carbohydrate

• polysaccharide

Which statement about unsaturated fats is true?

• They are more common in animals than in plants

• They have double bonds in their fatty acid chains

• They generally solidify at room temperature

• They contain more hydrogen than do saturated fats having the same number of carbon atoms

The structural level of a protein least affected by a disruption in hydrogen bonding is the

• Primary level

• Secondary level

• Tertiary level

• Quaternary level

Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?

• The two strands of the double helix would separate

• The phosphodiester linkages of the polynucleotide backbone would be broken

• The pyrimidines would be separated from the deoxyribose sugars

• All bases would be separated from the deoxyribose sugars

A covalent bond is most likely to be polar when...

• The two atoms sharing electrons are equally electronegative.

• Oxygen is one of the two atoms sharing electrons.

• One of the atoms sharing electrons is much more electronegative than the other atom.

• One of the atoms has absorbed more energy than the other atom.

Which of the following explains most specifically the attraction of water molecules to one another?

• Ionic bond

• Hydrophobic interaction

• Hydrogen bond

• Polar covalent bond

A covalent bond is the sharing of _______ between atoms, whereas an ionic bond is the _______.

• neutrons; sharing of electrons

• electrons; electrical attraction between two atoms

• protons; electrical attraction between two atoms

• protons; sharing of electrons

• electrons; transfer of electrons from one atom to another

Which statement about hydrogen bonds is true?

• They form between two hydrogen atoms

• They form only between hydrogen and oxygen atoms within a molecule

• They form between a highly electronegative atom and hydrogen

• They involve a transfer of electrons

• They are the strongest bonds because of their length

The hydrogen bond between two water molecules forms because water is

• polar

• nonpolar

• a liquid

• a small molecule

• hydrophobic