NLN NEX SCIENCE EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL
DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM
UPDATE
*Core Domains:*
*• Human Anatomy and Physiology*
*• Cell Biology and Biochemistry*
*• Genetics and Molecular Biology*
*• Microbiology and Immunology*
*• General and Organic Chemistry*
*• Physics and Biomechanics*
*• Scientific Method and Data Interpretation*
*• Professional Ethics and Regulatory Compliance*
*Introduction*
*The National League for Nursing Pre-Admission Examination for Natural Sciences is designe
Section One: Questions 1–100
Question 1
,Which organelle is primarily responsible for the synthesis of lipids and the detoxification of
harmful metabolic byproducts within a eukaryotic cell?
A. Rough endoplasmic reticulum
B. Smooth endoplasmic reticulum
C. Golgi apparatus
D. Lysosome
🟢 B. Smooth endoplasmic reticulum
🔴 Explanation: The smooth endoplasmic reticulum functions in lipid synthesis,
carbohydrate metabolism, and the detoxification of drugs and poisons. The rough
endoplasmic reticulum is dedicated to protein synthesis, while lysosomes handle cellular
digestion.
Question 2
A patient presents with severe dehydration, leading to an increased osmolarity of the
extracellular fluid. Which hormone will the posterior pituitary gland release to modify renal
water reabsorption?
A. Aldosterone
B. Cortisol
,C. Antidiuretic hormone
D. Oxytocin
🟢 C. Antidiuretic hormone
🔴 Explanation: Antidiuretic hormone (ADH), produced by the hypothalamus and released
by the posterior pituitary, increases water permeability in the collecting ducts of the kidneys
to conserve water. Aldosterone is secreted by the adrenal cortex.
Question 3
An object travels 60 meters due north in 12 seconds and then immediately turns and travels
20 meters due south in 4 seconds. What is the magnitude of the average velocity of the
object over the entire 16-second interval?
A. 2.5 m/s
B. 3.7 m/s
C. 5.0 m/s
D. 6.2 m/s
🟢 A. 2.5 m/s
, 🔴 Explanation: Average velocity is net displacement divided by total time. The net
displacement north is 60 - 20 = 40 meters. The total time elapsed is 12 + 4 = 16 seconds.
Dividing 40 meters by 16 seconds yields 2.5 m/s.
Question 4
During a laboratory experiment, a researcher accidentally spills a moderate amount of a
concentrated strong acid on a workbench. According to standard laboratory safety protocols,
which action should be taken first?
A. Neutralize the spill immediately with a strong base like sodium hydroxide.
B. Evacuate the entire building and pull the fire alarm.
C. Alert individuals in the immediate area and isolate the spill zone.
D. Absorb the liquid completely using dry paper towels.
🟢 C. Alert individuals in the immediate area and isolate the spill zone.
🔴 Explanation: Safety protocols dictate notifying nearby personnel first to prevent
exposure, followed by containment using appropriate neutralizing spill kits. Neutralizing with
a strong base creates a dangerous exothermic reaction.
Question 5
DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM
UPDATE
*Core Domains:*
*• Human Anatomy and Physiology*
*• Cell Biology and Biochemistry*
*• Genetics and Molecular Biology*
*• Microbiology and Immunology*
*• General and Organic Chemistry*
*• Physics and Biomechanics*
*• Scientific Method and Data Interpretation*
*• Professional Ethics and Regulatory Compliance*
*Introduction*
*The National League for Nursing Pre-Admission Examination for Natural Sciences is designe
Section One: Questions 1–100
Question 1
,Which organelle is primarily responsible for the synthesis of lipids and the detoxification of
harmful metabolic byproducts within a eukaryotic cell?
A. Rough endoplasmic reticulum
B. Smooth endoplasmic reticulum
C. Golgi apparatus
D. Lysosome
🟢 B. Smooth endoplasmic reticulum
🔴 Explanation: The smooth endoplasmic reticulum functions in lipid synthesis,
carbohydrate metabolism, and the detoxification of drugs and poisons. The rough
endoplasmic reticulum is dedicated to protein synthesis, while lysosomes handle cellular
digestion.
Question 2
A patient presents with severe dehydration, leading to an increased osmolarity of the
extracellular fluid. Which hormone will the posterior pituitary gland release to modify renal
water reabsorption?
A. Aldosterone
B. Cortisol
,C. Antidiuretic hormone
D. Oxytocin
🟢 C. Antidiuretic hormone
🔴 Explanation: Antidiuretic hormone (ADH), produced by the hypothalamus and released
by the posterior pituitary, increases water permeability in the collecting ducts of the kidneys
to conserve water. Aldosterone is secreted by the adrenal cortex.
Question 3
An object travels 60 meters due north in 12 seconds and then immediately turns and travels
20 meters due south in 4 seconds. What is the magnitude of the average velocity of the
object over the entire 16-second interval?
A. 2.5 m/s
B. 3.7 m/s
C. 5.0 m/s
D. 6.2 m/s
🟢 A. 2.5 m/s
, 🔴 Explanation: Average velocity is net displacement divided by total time. The net
displacement north is 60 - 20 = 40 meters. The total time elapsed is 12 + 4 = 16 seconds.
Dividing 40 meters by 16 seconds yields 2.5 m/s.
Question 4
During a laboratory experiment, a researcher accidentally spills a moderate amount of a
concentrated strong acid on a workbench. According to standard laboratory safety protocols,
which action should be taken first?
A. Neutralize the spill immediately with a strong base like sodium hydroxide.
B. Evacuate the entire building and pull the fire alarm.
C. Alert individuals in the immediate area and isolate the spill zone.
D. Absorb the liquid completely using dry paper towels.
🟢 C. Alert individuals in the immediate area and isolate the spill zone.
🔴 Explanation: Safety protocols dictate notifying nearby personnel first to prevent
exposure, followed by containment using appropriate neutralizing spill kits. Neutralizing with
a strong base creates a dangerous exothermic reaction.
Question 5
