AP Chemistry: Organic Chemistry & Biochemistry 3 — Questions and Answers
Question 1: Which class of biomolecule includes enzymes?
- Carbohydrates
- Lipids
- Proteins (Correct answer)
- Nucleic acids
Correct answer: Proteins
Enzymes are proteins that catalyze biochemical reactions.
Question 2: What is the general formula for a saturated alkane?
- CnH2n
- CnH2n+2 (Correct answer)
- CnH2n-2
- CnHn
Correct answer: CnH2n+2
Alkanes follow CnH2n+2 because they contain only single bonds.
Question 3: Markovnikov's rule predicts the product of:
- Addition of HX to an alkene (Correct answer)
- Free radical halogenation
- Esterification
- Saponification
Correct answer: Addition of HX to an alkene
Markovnikov's rule states H adds to the carbon with more hydrogens during HX addition to alkenes.
Question 4: Which monosaccharide is the primary fuel for cellular respiration?
- Fructose
- Glucose (Correct answer)
- Galactose
- Ribose
Correct answer: Glucose
Glucose is the main sugar oxidized to release energy in cells.
Question 5: An sp3 hybridized carbon has what bond angle?
- 90 degrees
- 109.5 degrees (Correct answer)
- 120 degrees
- 180 degrees
Correct answer: 109.5 degrees
sp3 hybridization gives tetrahedral geometry with 109.5 degree angles.
Question 6: Which type of lipid is the main component of cell membranes?
- Triglycerides
- Phospholipids (Correct answer)
- Steroids
- Waxes
Correct answer: Phospholipids
Phospholipids form the bilayer that makes up cell membranes.
Question 7: What product forms when a carboxylic acid reacts with an alcohol?
- An ether
- An ester (Correct answer)
- An aldehyde
- A ketone
Correct answer: An ester
Esterification (Fischer) combines an acid and alcohol to make an ester plus water.
AP Chemistry: Organic Chemistry & Biochemistry 3
Which class of biomolecule includes enzymes?