PAX Science NLN Exam Latest Update – A
comprehensive Review of 300 Real Questions
and Multichoice Answers with Clinical
Detailed Rationales| Pass Guaranteed
Introduction
Welcome to this comprehensive PAX Science NLN practice Test bank. This
resource contains 300 multiple-choice questions designed to help you prepare for
the National League for Nursing (NLN) Pre-Admission Examination (PAX) in
science. The questions cover key areas including biology, chemistry, physics, and
anatomy/physiology that are commonly tested on the PAX exam.
Each question is formatted with:
• A numbered question with a descriptive title
• Four answer choices (A, B, C, D)
• The correct answer indicated
• A detailed rationale explaining why the answer is correct and why the other
options are incorrect
This question bank is designed to simulate the actual exam experience and help
you identify areas where you may need additional study. The questions have been
carefully constructed to test your understanding of fundamental scientific concepts
and your ability to apply this knowledge to clinical and practical scenarios.
Good luck with your studies!
,BIOLOGY & LIFE SCIENCES
1. Cellular Respiration Products
What substance is produced as a result of cellular respiration and serves as the
primary energy carrier within cells?
A) Glucose
B) ATP
C) ADP
D) Oxygen
Answer: B) ATP
Rationale: ATP (adenosine triphosphate) is the primary energy currency of the
cell, produced during cellular respiration. Glucose is the starting molecule, ADP is
the precursor, and oxygen is a reactant, not a product.
2. Carbohydrate Storage in Animals
Which polysaccharide serves as the primary storage form of glucose in animals?
A) Starch
B) Cellulose
C) Glycogen
D) Sucrose
Answer: C) Glycogen
Rationale: Glycogen is the main storage form of glucose in animals and humans,
stored primarily in the liver and muscles. Starch serves this function in plants,
cellulose provides structural support in plants, and sucrose is a transport sugar.
3. Neuron Structure and Function
What is the long extension of a neuron that carries electrical impulses away from
the cell body to other cells?
,A) Dendrite
B) Axon
C) Synapse
D) Myelin sheath
Answer: B) Axon
Rationale: The axon is the long projection of a neuron that conducts electrical
impulses away from the cell body toward other neurons, muscles, or glands.
Dendrites receive signals, synapses are junctions between neurons, and myelin
sheaths insulate axons to speed signal transmission.
4. Female Reproductive Anatomy
Where does fertilization of the human egg typically occur?
A) Uterus
B) Fallopian tube
C) Vagina
D) Cervix
Answer: B) Fallopian tube
Rationale: Fertilization typically occurs in the ampulla of the fallopian tube
(oviduct). The uterus is where implantation and fetal development occur, the
vagina receives sperm during intercourse, and the cervix is the lower part of the
uterus.
5. Meiosis and Chromosome Number
What is the primary result of meiotic cell division?
A) Production of identical daughter cells
B) Production of cells with half the usual chromosome number
C) Production of cells with double the chromosome number
D) Production of cells with the same chromosome number
Answer: B) Production of cells with half the usual chromosome number
, Rationale: Meiosis reduces the chromosome number by half, producing haploid
gametes (sperm and egg cells) from diploid cells. Mitosis produces identical
daughter cells with the same chromosome number.
6. Hardy-Weinberg Equilibrium
Which condition must be present for a population to remain in Hardy-Weinberg
equilibrium?
A) High mutation rate
B) Non-random mating
C) Isolation from other populations
D) Natural selection pressure
Answer: C) Isolation from other populations
Rationale: Hardy-Weinberg equilibrium requires no gene flow (population
isolation), no mutations, random mating, large population size, and no natural
selection. Isolation prevents gene flow from altering allele frequencies.
7. Protein Synthesis Organelles
Which organelle is responsible for protein synthesis and is abundant in cells that
produce large amounts of proteins for export?
A) Golgi apparatus
B) Mitochondria
C) Ribosome
D) Lysosome
Answer: C) Ribosome
Rationale: Ribosomes are the sites of protein synthesis. Cells that produce large
amounts of proteins (like pancreatic cells producing digestive enzymes) have
abundant ribosomes. The Golgi apparatus modifies and packages proteins,
mitochondria produce ATP, and lysosomes contain digestive enzymes.
comprehensive Review of 300 Real Questions
and Multichoice Answers with Clinical
Detailed Rationales| Pass Guaranteed
Introduction
Welcome to this comprehensive PAX Science NLN practice Test bank. This
resource contains 300 multiple-choice questions designed to help you prepare for
the National League for Nursing (NLN) Pre-Admission Examination (PAX) in
science. The questions cover key areas including biology, chemistry, physics, and
anatomy/physiology that are commonly tested on the PAX exam.
Each question is formatted with:
• A numbered question with a descriptive title
• Four answer choices (A, B, C, D)
• The correct answer indicated
• A detailed rationale explaining why the answer is correct and why the other
options are incorrect
This question bank is designed to simulate the actual exam experience and help
you identify areas where you may need additional study. The questions have been
carefully constructed to test your understanding of fundamental scientific concepts
and your ability to apply this knowledge to clinical and practical scenarios.
Good luck with your studies!
,BIOLOGY & LIFE SCIENCES
1. Cellular Respiration Products
What substance is produced as a result of cellular respiration and serves as the
primary energy carrier within cells?
A) Glucose
B) ATP
C) ADP
D) Oxygen
Answer: B) ATP
Rationale: ATP (adenosine triphosphate) is the primary energy currency of the
cell, produced during cellular respiration. Glucose is the starting molecule, ADP is
the precursor, and oxygen is a reactant, not a product.
2. Carbohydrate Storage in Animals
Which polysaccharide serves as the primary storage form of glucose in animals?
A) Starch
B) Cellulose
C) Glycogen
D) Sucrose
Answer: C) Glycogen
Rationale: Glycogen is the main storage form of glucose in animals and humans,
stored primarily in the liver and muscles. Starch serves this function in plants,
cellulose provides structural support in plants, and sucrose is a transport sugar.
3. Neuron Structure and Function
What is the long extension of a neuron that carries electrical impulses away from
the cell body to other cells?
,A) Dendrite
B) Axon
C) Synapse
D) Myelin sheath
Answer: B) Axon
Rationale: The axon is the long projection of a neuron that conducts electrical
impulses away from the cell body toward other neurons, muscles, or glands.
Dendrites receive signals, synapses are junctions between neurons, and myelin
sheaths insulate axons to speed signal transmission.
4. Female Reproductive Anatomy
Where does fertilization of the human egg typically occur?
A) Uterus
B) Fallopian tube
C) Vagina
D) Cervix
Answer: B) Fallopian tube
Rationale: Fertilization typically occurs in the ampulla of the fallopian tube
(oviduct). The uterus is where implantation and fetal development occur, the
vagina receives sperm during intercourse, and the cervix is the lower part of the
uterus.
5. Meiosis and Chromosome Number
What is the primary result of meiotic cell division?
A) Production of identical daughter cells
B) Production of cells with half the usual chromosome number
C) Production of cells with double the chromosome number
D) Production of cells with the same chromosome number
Answer: B) Production of cells with half the usual chromosome number
, Rationale: Meiosis reduces the chromosome number by half, producing haploid
gametes (sperm and egg cells) from diploid cells. Mitosis produces identical
daughter cells with the same chromosome number.
6. Hardy-Weinberg Equilibrium
Which condition must be present for a population to remain in Hardy-Weinberg
equilibrium?
A) High mutation rate
B) Non-random mating
C) Isolation from other populations
D) Natural selection pressure
Answer: C) Isolation from other populations
Rationale: Hardy-Weinberg equilibrium requires no gene flow (population
isolation), no mutations, random mating, large population size, and no natural
selection. Isolation prevents gene flow from altering allele frequencies.
7. Protein Synthesis Organelles
Which organelle is responsible for protein synthesis and is abundant in cells that
produce large amounts of proteins for export?
A) Golgi apparatus
B) Mitochondria
C) Ribosome
D) Lysosome
Answer: C) Ribosome
Rationale: Ribosomes are the sites of protein synthesis. Cells that produce large
amounts of proteins (like pancreatic cells producing digestive enzymes) have
abundant ribosomes. The Golgi apparatus modifies and packages proteins,
mitochondria produce ATP, and lysosomes contain digestive enzymes.
