BIO 181 QUIZ 2 MOCK TEST WITH ANSWER RATIONALES 2026

BIO 181 QUIZ 2 MOCK TEST WITH ANSWER
RATIONALES 2026

◉ Which organelle is directly responsible for modifying, sorting, and
packaging proteins?


A) Smooth ER
B) Golgi apparatus
C) Nucleolus
D) Lysosome.
Answer: B) Golgi apparatus


◉ Which cytoskeletal element is made of actin and helps with
movement and cell shape?


A) Microtubules
B) Microfilaments
C) Intermediate filaments
D) Collagen fibers.
Answer: B) Microfilaments


◉ Which organelle detoxifies hydrogen peroxide using catalase?

,A) Lysosome
B) Peroxisome
C) Proteasome
D) Rough ER.
Answer: B) Peroxisome


◉ What is the main function of the nucleolus?


A) Store DNA
B) Assemble ribosomes
C) Break down waste
D) Modify lipids.
Answer: B) Assemble ribosomes


◉ The plasma membrane is best described by which model?


A) Central dogma model
B) Double helix model
C) Fluid mosaic model
D) Endosymbiotic model.
Answer: C) Fluid mosaic model

, ◉ Which of the following best describes facilitated diffusion?


A) Requires ATP to move molecules against a gradient
B) Moves molecules down a gradient using proteins
C) Moves water across the membrane by osmosis
D) Bulk transport using vesicles.
Answer: B) Moves molecules down a gradient using proteins


◉ The biconcave shape of red blood cells is maintained by:


A) Mitochondria and chloroplasts
B) Ribosomes and Golgi bodies
C) Spectrin-actin cytoskeleton and membrane proteins
D) Smooth ER and lysosomes.
Answer: C) Spectrin-actin cytoskeleton and membrane proteins


◉ A red blood cell placed in a hypotonic solution will:


A) Shrink
B) Stay the same
C) Swell and possibly burst