Praxis Biology (5235) REAL EXAM
PRAXIS BIOLOGY: CONTENT KNOWLEDGE | TEST CODE 5235 | COMPREHENSIVE
TEST BANK | VERIFIED QUESTIONS & ANSWERS LATEST VERSION 2026/2027 (PASS
GUARANTEE) GRADED A+
Praxis Biology 5235 real exam
1. Which organelle is the primary site of ATP production in eukaryotic cells?
A) Golgi apparatus
B) Mitochondrion
C) Lysosome
D) Ribosome
Correct Answer: B
2. The fluid mosaic model describes the structure of:
A) the nuclear envelope
B) the cell wall
C) the plasma membrane
D) the cytoskeleton
Correct Answer: C
3. Which structure is responsible for synthesizing proteins in the cell?
A) Ribosome
B) Peroxisome
C) Vacuole
D) Centriole
Correct Answer: A
4. Which organelle contains hydrolytic enzymes used to break down waste
materials?
A) Lysosome
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, Praxis Biology (5235) REAL EXAM
B) Mitochondrion
C) Chloroplast
D) Nucleolus
Correct Answer: A
5. The process by which a cell engulfs large particles is called:
A) exocytosis
B) phagocytosis
C) osmosis
D) diffusion
Correct Answer: B
6. Which of the following is found in plant cells but not animal cells?
A) Mitochondria
B) Cell wall
C) Ribosomes
D) Nucleus
Correct Answer: B
7. The semi-permeable nature of the plasma membrane is primarily due to:
A) cellulose fibers
B) the phospholipid bilayer
C) a peptidoglycan layer
D) a chitin matrix
Correct Answer: B
8. Active transport differs from passive transport because it:
A) requires no membrane proteins
B) moves molecules down their concentration gradient
C) requires energy input
D) only occurs in plant cells
Correct Answer: C
9. Which organelle modifies, sorts, and packages proteins for secretion?
A) Rough ER
B) Golgi apparatus
C) Smooth ER
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, Praxis Biology (5235) REAL EXAM
D) Nucleolus
Correct Answer: B
10. The cytoskeleton component primarily responsible for cell shape and
movement is:
A) microtubules
B) cellulose
C) the nuclear envelope
D) the cell wall
Correct Answer: A
11. Which type of cell junction allows direct communication between
adjacent animal cells?
A) Tight junction
B) Desmosome
C) Gap junction
D) Plasmodesmata
Correct Answer: C
12. Osmosis is best defined as:
A) movement of solutes through a membrane
B) movement of water across a selectively permeable membrane
C) bulk transport of large molecules
D) movement of ions against a gradient
Correct Answer: B
13. A cell placed in a hypertonic solution will most likely:
A) swell and lyse
B) remain unchanged
C) shrink (crenate)
D) divide rapidly
Correct Answer: C
14. Which of the following best describes the endosymbiotic theory?
A) Mitochondria and chloroplasts evolved from cell wall remnants
B) Mitochondria and chloroplasts originated as free-living prokaryotes
engulfed by ancestral eukaryotic cells
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, Praxis Biology (5235) REAL EXAM
C) All organelles arose from the nucleus
D) Ribosomes evolved from viral particles
Correct Answer: B
15. The nucleolus is the site of:
A) DNA replication
B) ribosomal RNA synthesis and ribosome assembly
C) lipid synthesis
D) ATP synthesis
Correct Answer: B
16. Prokaryotic cells differ from eukaryotic cells in that prokaryotes:
A) lack a plasma membrane
B) lack membrane-bound organelles
C) lack ribosomes
D) lack DNA
Correct Answer: B
17. Which process moves substances against their concentration gradient
using carrier proteins and ATP?
A) Facilitated diffusion
B) Simple diffusion
C) Active transport
D) Osmosis
Correct Answer: C
18. The cell theory states that:
A) all cells arise spontaneously
B) cells are the basic unit of life and arise from preexisting cells
C) only eukaryotic cells are living
D) viruses are considered cells
Correct Answer: B
19. Which organelle is responsible for photosynthesis?
A) Mitochondrion
B) Chloroplast
C) Chromoplast
Page 4 of 41
PRAXIS BIOLOGY: CONTENT KNOWLEDGE | TEST CODE 5235 | COMPREHENSIVE
TEST BANK | VERIFIED QUESTIONS & ANSWERS LATEST VERSION 2026/2027 (PASS
GUARANTEE) GRADED A+
Praxis Biology 5235 real exam
1. Which organelle is the primary site of ATP production in eukaryotic cells?
A) Golgi apparatus
B) Mitochondrion
C) Lysosome
D) Ribosome
Correct Answer: B
2. The fluid mosaic model describes the structure of:
A) the nuclear envelope
B) the cell wall
C) the plasma membrane
D) the cytoskeleton
Correct Answer: C
3. Which structure is responsible for synthesizing proteins in the cell?
A) Ribosome
B) Peroxisome
C) Vacuole
D) Centriole
Correct Answer: A
4. Which organelle contains hydrolytic enzymes used to break down waste
materials?
A) Lysosome
Page 1 of 41
, Praxis Biology (5235) REAL EXAM
B) Mitochondrion
C) Chloroplast
D) Nucleolus
Correct Answer: A
5. The process by which a cell engulfs large particles is called:
A) exocytosis
B) phagocytosis
C) osmosis
D) diffusion
Correct Answer: B
6. Which of the following is found in plant cells but not animal cells?
A) Mitochondria
B) Cell wall
C) Ribosomes
D) Nucleus
Correct Answer: B
7. The semi-permeable nature of the plasma membrane is primarily due to:
A) cellulose fibers
B) the phospholipid bilayer
C) a peptidoglycan layer
D) a chitin matrix
Correct Answer: B
8. Active transport differs from passive transport because it:
A) requires no membrane proteins
B) moves molecules down their concentration gradient
C) requires energy input
D) only occurs in plant cells
Correct Answer: C
9. Which organelle modifies, sorts, and packages proteins for secretion?
A) Rough ER
B) Golgi apparatus
C) Smooth ER
Page 2 of 41
, Praxis Biology (5235) REAL EXAM
D) Nucleolus
Correct Answer: B
10. The cytoskeleton component primarily responsible for cell shape and
movement is:
A) microtubules
B) cellulose
C) the nuclear envelope
D) the cell wall
Correct Answer: A
11. Which type of cell junction allows direct communication between
adjacent animal cells?
A) Tight junction
B) Desmosome
C) Gap junction
D) Plasmodesmata
Correct Answer: C
12. Osmosis is best defined as:
A) movement of solutes through a membrane
B) movement of water across a selectively permeable membrane
C) bulk transport of large molecules
D) movement of ions against a gradient
Correct Answer: B
13. A cell placed in a hypertonic solution will most likely:
A) swell and lyse
B) remain unchanged
C) shrink (crenate)
D) divide rapidly
Correct Answer: C
14. Which of the following best describes the endosymbiotic theory?
A) Mitochondria and chloroplasts evolved from cell wall remnants
B) Mitochondria and chloroplasts originated as free-living prokaryotes
engulfed by ancestral eukaryotic cells
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, Praxis Biology (5235) REAL EXAM
C) All organelles arose from the nucleus
D) Ribosomes evolved from viral particles
Correct Answer: B
15. The nucleolus is the site of:
A) DNA replication
B) ribosomal RNA synthesis and ribosome assembly
C) lipid synthesis
D) ATP synthesis
Correct Answer: B
16. Prokaryotic cells differ from eukaryotic cells in that prokaryotes:
A) lack a plasma membrane
B) lack membrane-bound organelles
C) lack ribosomes
D) lack DNA
Correct Answer: B
17. Which process moves substances against their concentration gradient
using carrier proteins and ATP?
A) Facilitated diffusion
B) Simple diffusion
C) Active transport
D) Osmosis
Correct Answer: C
18. The cell theory states that:
A) all cells arise spontaneously
B) cells are the basic unit of life and arise from preexisting cells
C) only eukaryotic cells are living
D) viruses are considered cells
Correct Answer: B
19. Which organelle is responsible for photosynthesis?
A) Mitochondrion
B) Chloroplast
C) Chromoplast
Page 4 of 41
