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ASU Bio 181 Exam 1
Practice Question Bank
Comprehensive Review with 78 Questions, Answers & Rationales
BIO 181 — General Biology I
Edition 1 · August 2026
,Table of Contents
1. Instructions for Use 2
2. Practice Questions with Answers & Rationales 2
BIO 181 · Arizona State University Page 1
, ASU BIO 181 EXAM 1 PRACTICE GUIDE CELL BIOLOGY & GENETICS
How to Use This Guide
Read each stem, choose your answer, then check the rationale below. The correct option is marked, and each wrong option
is explained. This guide contains 78 questions covering the full scope of the ASU Bio 181 Exam 1.
Category: ASU Bio 181 — Exam 1
1 The association of ribosomes with _____ invaginations would support the _____ theory.
A membrane, endomembrane
B nuclear, endosymbiotic
C membrane, endosymbiotic
D cytoplasmic, cell
Why A is correct: Ribosomes bound to membrane invaginations support the endomembrane theory, which explains the
evolution of the endomembrane system.
B — The endosymbiotic theory involves mitochondria and chloroplasts.
C — Membrane invaginations support endomembrane theory, not endosymbiotic theory.
D — Cytoplasmic is not a theory name.
2 After a cell is pancake shaped in a cell culture dish, the order of events that occurs as a cell walks is:
A filapodia, lamellipodia, cell muscle, retraction fiber
B lamellipodia, filapodia, retraction fiber, cell muscle
C retraction fiber, filapodia, lamellipodia, cell muscle
D cell muscle, retraction fiber, filapodia, lamellipodia
Why A is correct: Cell migration proceeds in the order: filapodia extend first, then lamellipodia spread, followed by cell
muscle contraction, and finally retraction fibers pull the rear of the cell.
B — Filapodia come before lamellipodia.
C — Retraction fibers occur at the end.
D — Cell muscle contraction occurs after lamellipodia.
ASU Bio 181 Exam 1
Practice Question Bank
Comprehensive Review with 78 Questions, Answers & Rationales
BIO 181 — General Biology I
Edition 1 · August 2026
,Table of Contents
1. Instructions for Use 2
2. Practice Questions with Answers & Rationales 2
BIO 181 · Arizona State University Page 1
, ASU BIO 181 EXAM 1 PRACTICE GUIDE CELL BIOLOGY & GENETICS
How to Use This Guide
Read each stem, choose your answer, then check the rationale below. The correct option is marked, and each wrong option
is explained. This guide contains 78 questions covering the full scope of the ASU Bio 181 Exam 1.
Category: ASU Bio 181 — Exam 1
1 The association of ribosomes with _____ invaginations would support the _____ theory.
A membrane, endomembrane
B nuclear, endosymbiotic
C membrane, endosymbiotic
D cytoplasmic, cell
Why A is correct: Ribosomes bound to membrane invaginations support the endomembrane theory, which explains the
evolution of the endomembrane system.
B — The endosymbiotic theory involves mitochondria and chloroplasts.
C — Membrane invaginations support endomembrane theory, not endosymbiotic theory.
D — Cytoplasmic is not a theory name.
2 After a cell is pancake shaped in a cell culture dish, the order of events that occurs as a cell walks is:
A filapodia, lamellipodia, cell muscle, retraction fiber
B lamellipodia, filapodia, retraction fiber, cell muscle
C retraction fiber, filapodia, lamellipodia, cell muscle
D cell muscle, retraction fiber, filapodia, lamellipodia
Why A is correct: Cell migration proceeds in the order: filapodia extend first, then lamellipodia spread, followed by cell
muscle contraction, and finally retraction fibers pull the rear of the cell.
B — Filapodia come before lamellipodia.
C — Retraction fibers occur at the end.
D — Cell muscle contraction occurs after lamellipodia.
