BIOLOGY EXAM PREP
BIOL 271 / BIOL271 Module 1:
(Latest 2026/2027 Update)
100% Verified Questions & Answers
A+
| Grade A
Aligned to BIOL 271 Course Objectives • College-Level Biology
A+ QUESTIONS 5 SECTIONS 100%
VERIFIED COMPLETE RATIONALES
CATEGORIES
1. Macromolecules & Chemical Building Blocks (10 Questions)
2. Prokaryotic vs Eukaryotic Cell Structure (10 Questions)
3. Cellular Organelles & Their Functions (10 Questions)
4. Membrane Structure & Transport (10 Questions)
5. Microbial World Overview & Microscopy (10 Questions)
STUVIAACTUALEXAM
Passing Score: 80% • 1 Mark per Question • Total 50 Marks
, SECTION 1: Macromolecules & Chemical Building Blocks
Q1.
A laboratory technician is analyzing the composition of a bacterial capsule. The capsule is found to be composed of long chains
of sugar subunits. These macromolecules belong to which class?
A. Proteins built from amino acids
B. Polysaccharides (carbohydrates) built from monosaccharide subunits
C. Nucleic acids built from nucleotides
D. Lipids built from fatty acids and glycerol
Correct Answer: B
Rationale: Bacterial capsules are typically polysaccharide layers; carbohydrates are polymers of monosaccharides.
Q2.
A researcher denatures a purified enzyme by heating it and observes loss of catalytic activity. The primary level of protein
structure that remains intact after complete denaturation (assuming no peptide-bond breakage) is the:
A. Primary structure (amino-acid sequence linked by peptide bonds)
B. Tertiary structure only
C. Quaternary structure
D. All levels equally
Correct Answer: A
Rationale: Denaturation disrupts non-covalent interactions and disulfide bonds that stabilize higher-order structure; the covalent primary
sequence remains.
Q3.
In a bacterial cell, DNA is being replicated. The monomers that are polymerized to form the new DNA strand are:
A. Amino acids
B. Fatty acids
C. Deoxyribonucleoside triphosphates (dNTPs)
D. Monosaccharides only
Correct Answer: C
Rationale: DNA polymerase incorporates dNTPs, releasing pyrophosphate as the phosphodiester backbone forms.
Q4.
A phospholipid bilayer forms the core of the plasma membrane. The property that allows phospholipids to arrange
spontaneously into bilayers in water is:
A. Their completely hydrophilic nature
B. Their rigid planar structure
C. Their positive charge only
D. Their amphipathic nature, with hydrophilic heads and hydrophobic tails
Correct Answer: D
Rationale: Amphipathic molecules orient heads toward water and tails away from water, producing bilayers.
Q5.
A student compares starch and cellulose. Both are polymers of glucose, yet cellulose is far more rigid. The key structural
difference is:
A. Starch contains peptide bonds
B. The type of glycosidic linkage (α in starch vs β in cellulose) and the resulting chain packing and hydrogen bonding
C. Cellulose is a nucleic acid
D. Starch contains nitrogen bases
Correct Answer: B
Rationale: β-1,4 linkages in cellulose allow straight chains and extensive H-bonding; α linkages in starch produce helical, more compact
structures.
BIOL 271 / BIOL271 Module 1:
(Latest 2026/2027 Update)
100% Verified Questions & Answers
A+
| Grade A
Aligned to BIOL 271 Course Objectives • College-Level Biology
A+ QUESTIONS 5 SECTIONS 100%
VERIFIED COMPLETE RATIONALES
CATEGORIES
1. Macromolecules & Chemical Building Blocks (10 Questions)
2. Prokaryotic vs Eukaryotic Cell Structure (10 Questions)
3. Cellular Organelles & Their Functions (10 Questions)
4. Membrane Structure & Transport (10 Questions)
5. Microbial World Overview & Microscopy (10 Questions)
STUVIAACTUALEXAM
Passing Score: 80% • 1 Mark per Question • Total 50 Marks
, SECTION 1: Macromolecules & Chemical Building Blocks
Q1.
A laboratory technician is analyzing the composition of a bacterial capsule. The capsule is found to be composed of long chains
of sugar subunits. These macromolecules belong to which class?
A. Proteins built from amino acids
B. Polysaccharides (carbohydrates) built from monosaccharide subunits
C. Nucleic acids built from nucleotides
D. Lipids built from fatty acids and glycerol
Correct Answer: B
Rationale: Bacterial capsules are typically polysaccharide layers; carbohydrates are polymers of monosaccharides.
Q2.
A researcher denatures a purified enzyme by heating it and observes loss of catalytic activity. The primary level of protein
structure that remains intact after complete denaturation (assuming no peptide-bond breakage) is the:
A. Primary structure (amino-acid sequence linked by peptide bonds)
B. Tertiary structure only
C. Quaternary structure
D. All levels equally
Correct Answer: A
Rationale: Denaturation disrupts non-covalent interactions and disulfide bonds that stabilize higher-order structure; the covalent primary
sequence remains.
Q3.
In a bacterial cell, DNA is being replicated. The monomers that are polymerized to form the new DNA strand are:
A. Amino acids
B. Fatty acids
C. Deoxyribonucleoside triphosphates (dNTPs)
D. Monosaccharides only
Correct Answer: C
Rationale: DNA polymerase incorporates dNTPs, releasing pyrophosphate as the phosphodiester backbone forms.
Q4.
A phospholipid bilayer forms the core of the plasma membrane. The property that allows phospholipids to arrange
spontaneously into bilayers in water is:
A. Their completely hydrophilic nature
B. Their rigid planar structure
C. Their positive charge only
D. Their amphipathic nature, with hydrophilic heads and hydrophobic tails
Correct Answer: D
Rationale: Amphipathic molecules orient heads toward water and tails away from water, producing bilayers.
Q5.
A student compares starch and cellulose. Both are polymers of glucose, yet cellulose is far more rigid. The key structural
difference is:
A. Starch contains peptide bonds
B. The type of glycosidic linkage (α in starch vs β in cellulose) and the resulting chain packing and hydrogen bonding
C. Cellulose is a nucleic acid
D. Starch contains nitrogen bases
Correct Answer: B
Rationale: β-1,4 linkages in cellulose allow straight chains and extensive H-bonding; α linkages in starch produce helical, more compact
structures.
