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AP Biology Unit 1: Chemistry of Life

8 questions

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Unit 1: Chemistry of Life

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Question 1

Which of the following best explains why water is described as a polar molecule?

A.Water has equal numbers of hydrogen and oxygen atoms.B.Oxygen is more electronegative than hydrogen, creating an uneven distribution of charge.C.Water has a linear molecular geometry.D.The hydrogen atoms are double-bonded to oxygen.

Question 2

Which type of bond holds two complementary DNA strands together in the double helix?

A.Covalent bonds.B.Hydrogen bonds.C.Ionic bonds.D.Disulfide bridges.

Question 3

Which of the following is an example of a hydrophobic interaction?

A.Salt dissolving in water.B.Phospholipid tails clustering inward in a bilayer.C.Hydrogen bonding between water and DNA bases.D.Ionic attraction between Na

^{+}

and Cl

^{-}

Question 4

Saturated and unsaturated fatty acids differ in:

A.Whether the carbon chain has any double bonds.B.Whether they contain glycerol.C.Whether they are esters or acids.D.Number of carboxyl groups.

Question 5

A buffer maintains stable pH by:

A.Reacting with both added acids and bases.B.Preventing all chemical reactions in solution.C.Producing equal amounts of H

^{+}

and OH

^{-}

.D.Neutralizing only acidic solutions.

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Question 6

A polysaccharide and a polypeptide both contain monomers linked by which type of reaction?

A.Hydrolysis reaction (water added).B.Dehydration synthesis (water removed).C.Oxidation reaction.D.Reduction reaction.

Question 7

Which functional group is most likely to ionize and donate a proton at physiological pH (~7.4)?

A.Hydroxyl (

- O H

).B.Methyl (

- C H_{3}

).C.Carboxyl (

- C O O H

).D.Amino (

- N H_{2}

Question 8

Which level of protein structure is determined by hydrogen bonding between backbone amine and carbonyl groups?

A.Primary structure.B.Secondary structure.C.Tertiary structure.D.Quaternary structure.

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