Campbell Biology 12th Edition – 100
MCQAs for Exam Revision
Description: This revision set covers core concepts from Campbell Biology (12th
Edition), spanning the chemistry of life, cell structure and function, cellular respiration,
photosynthesis, genetics, evolution, and ecology. Each question is designed to test both
recall and applied understanding for exam preparation.
Keywords: Campbell Biology, Urry, test bank, multiple choice, biology exam, cell
biology, genetics, evolution, ecology, revision
Unit 1: The Chemistry of Life
1. The four most abundant elements in living organisms are:
A) Carbon, hydrogen, oxygen, iron
B) Carbon, hydrogen, oxygen, nitrogen
C) Carbon, nitrogen, oxygen, magnesium
D) Carbon, hydrogen, calcium, nitrogen
Answer: B ✅ — CHON make up approximately 96% of living matter .
2. Hydrogen bonds are important for all of the following EXCEPT:
A) Protein secondary structure
B) DNA double helix stability
C) Water's high specific heat
D) Ionic bonding in salts
Answer: D ✅ — Hydrogen bonds are not ionic bonds; salts form ionic bonds .
,3. Water has a high specific heat because:
A) Hydrogen bonds resist temperature change
B) It evaporates quickly
C) It is nonpolar
D) It has low surface tension
Answer: A ✅ — Hydrogen bonds absorb heat before water temperature rises .
4. A functional group that acts as a base (accepts H⁺) is the:
A) Carboxyl group (-COOH)
B) Amino group (-NH₂)
C) Hydroxyl group (-OH)
D) Phosphate group (-PO₄²⁻)
Answer: B ✅ — Amino groups are basic; carboxyl groups are acidic .
5. Dehydration synthesis reactions:
A) Remove a water molecule to form a covalent bond
B) Build polymers from monomers
C) Require energy input
D) Release water as a product
Answer: A, B, C, D ✅ — All are correct. Dehydration synthesis builds polymers by
removing water and requires energy .
6. A monosaccharide with 6 carbons is called a:
A) Triose
B) Pentose
C) Hexose
D) Tetrose
, Answer: C ✅ — Glucose and fructose are hexoses (C₆H₁₂O₆) .
7. The bond that links amino acids in a protein is called a:
A) Glycosidic bond
B) Peptide bond
C) Phosphodiester bond
D) Hydrogen bond
Answer: B ✅ — Peptide bonds form between the carboxyl of one amino acid and the
amino of another .
8. Polysaccharides include all of the following EXCEPT:
A) Starch
B) Glycogen
C) Cellulose
D) Sucrose
Answer: D ✅ — Sucrose is a disaccharide, not a polysaccharide .
9. Secondary structure of proteins includes:
A) Alpha helix
B) Beta pleated sheet
C) Amino acid sequence
D) Disulfide bridges
Answer: A, B ✅ — Alpha helices and beta pleated sheets are secondary structures .
10. Isomers include which of the following types?
A) Structural isomers
B) Cis-trans isomers
MCQAs for Exam Revision
Description: This revision set covers core concepts from Campbell Biology (12th
Edition), spanning the chemistry of life, cell structure and function, cellular respiration,
photosynthesis, genetics, evolution, and ecology. Each question is designed to test both
recall and applied understanding for exam preparation.
Keywords: Campbell Biology, Urry, test bank, multiple choice, biology exam, cell
biology, genetics, evolution, ecology, revision
Unit 1: The Chemistry of Life
1. The four most abundant elements in living organisms are:
A) Carbon, hydrogen, oxygen, iron
B) Carbon, hydrogen, oxygen, nitrogen
C) Carbon, nitrogen, oxygen, magnesium
D) Carbon, hydrogen, calcium, nitrogen
Answer: B ✅ — CHON make up approximately 96% of living matter .
2. Hydrogen bonds are important for all of the following EXCEPT:
A) Protein secondary structure
B) DNA double helix stability
C) Water's high specific heat
D) Ionic bonding in salts
Answer: D ✅ — Hydrogen bonds are not ionic bonds; salts form ionic bonds .
,3. Water has a high specific heat because:
A) Hydrogen bonds resist temperature change
B) It evaporates quickly
C) It is nonpolar
D) It has low surface tension
Answer: A ✅ — Hydrogen bonds absorb heat before water temperature rises .
4. A functional group that acts as a base (accepts H⁺) is the:
A) Carboxyl group (-COOH)
B) Amino group (-NH₂)
C) Hydroxyl group (-OH)
D) Phosphate group (-PO₄²⁻)
Answer: B ✅ — Amino groups are basic; carboxyl groups are acidic .
5. Dehydration synthesis reactions:
A) Remove a water molecule to form a covalent bond
B) Build polymers from monomers
C) Require energy input
D) Release water as a product
Answer: A, B, C, D ✅ — All are correct. Dehydration synthesis builds polymers by
removing water and requires energy .
6. A monosaccharide with 6 carbons is called a:
A) Triose
B) Pentose
C) Hexose
D) Tetrose
, Answer: C ✅ — Glucose and fructose are hexoses (C₆H₁₂O₆) .
7. The bond that links amino acids in a protein is called a:
A) Glycosidic bond
B) Peptide bond
C) Phosphodiester bond
D) Hydrogen bond
Answer: B ✅ — Peptide bonds form between the carboxyl of one amino acid and the
amino of another .
8. Polysaccharides include all of the following EXCEPT:
A) Starch
B) Glycogen
C) Cellulose
D) Sucrose
Answer: D ✅ — Sucrose is a disaccharide, not a polysaccharide .
9. Secondary structure of proteins includes:
A) Alpha helix
B) Beta pleated sheet
C) Amino acid sequence
D) Disulfide bridges
Answer: A, B ✅ — Alpha helices and beta pleated sheets are secondary structures .
10. Isomers include which of the following types?
A) Structural isomers
B) Cis-trans isomers
