AP Bio Quiz (1.1 & 1.2,3)

In a chemistry class, a student is asked about the maximum number of atoms or molecules a single carbon atom can bond with. Her reply is _____.

Which of the following is least likely to bond with carbon as a functional group in biological systems?

(Use the figure provided)

• carbonyl
• hydroxyl
• amino

• methane

Tags

NGSS.HS-LS1-6

Which of the following functional groups is hydrophobic or nonpolar?

(Use the figure provided)

• carbonyl
• hydroxyl
• methyl
• sulfhydryl

What property of phosphate makes phosphate-containing molecules hydrophilic or polar? (Use the figure provided)

• Phosphate groups release H+, making its parent molecule hydrophilic.

• Phosphate groups absorb H+ ion, making its parent molecule hydrophilic.

• Phosphate groups release OH−, making its parent molecule hydrophilic.

• Phosphate groups release OH−, making its parent molecule hydrophobic.

Why is carbon uniquely suited to form the backbone of organic molecules?

• Carbon can form up to four stable covalent bonds, allowing for complex molecules.

• Carbon can form up to three stable covalent bonds, allowing for complex molecules.

• Carbon can form up to four ionic bonds, allowing for complex molecules.

• Carbon can form up to three ionic bonds, allowing for complex molecules.

Tags

NGSS.HS-LS1-6

NGSS.HS-PS1-2

Which of the following best describes the process of dehydration synthesis in carbohydrates?

• The removal of a water molecule breaks a covalent bond between sugar monomers.

• The removal of a water molecule forms a covalent bond between sugar monomers.

• The addition of a water molecule breaks a covalent bond between sugar monomers.

• The addition of a water molecule forms a covalent bond between sugar monomers.

Which of the following best explains the reaction represented in the figure below?

• It is a dehydration synthesis reaction involved in the formation of water.

• The reaction is the hydrolysis of a nucleic acid and results in the formation of a nucleotide.
• The reaction is the hydrolysis of a nucleic acid and results in the formation of a phospholipid
• It is a dehydration synthesis reaction involved in the formation of a protein.

Tags

NGSS.HS-LS1-6

Which of the following best describes the formation of the bond shown in the figure below?

• An ionic bond is formed between a carbon atom of one amino acid and the nitrogen atom of the other amino acid.
• An ionic bond is formed when the negative charge of a OH group is balanced by the positive charge of a hydrogen ion.
• A covalent bond is formed between a carbon atom and a nitrogen atom along with the formation of water.
• A covalent bond is formed that replaces the hydrogen bond between the OH group and the H atom.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

An enzyme catalyzes the dehydration of a signaling molecule. Which of the following best explains how this enzyme carries out its function?

• The enzyme breaks covalent bonds within the signaling molecule by the addition of a water molecule.

• The enzyme breaks covalent bonds within the signaling molecule by removing a water molecule.

• The enzyme forms covalent bonds between the signaling molecule and another molecule by the addition of a water molecule.

• The enzyme forms covalent bonds between the signaling molecule and another molecule by removing a water molecule.

Why is water considered a polar molecule?

• Oxygen is more electronegative than hydrogen, creating a partial negative charge near the oxygen atom.

• Oxygen is more electronegative than hydrogen, creating a partial positive charge near the oxygen atom.

• Hydrogen is more electronegative than oxygen, creating a partial negative charge near the hydrogen atom.

• Hydrogen is more electronegative than oxygen, creating a partial positive charge near the hydrogen atom.