HESI A2 BIOLOGY PRACTICE TEST 2025 WITH 25 ESSENTIAL
QUESTIONS & ANSWERS TO BOOST YOUR SCORE LATEST UPDATE
Question 1:
Which of the following molecules contains glucose?
• A) Proteins
• B) Lipids
• C) Nucleic acids
• ✅ D) Carbohydrates
Correct Answer: D. Carbohydrates
Rationale: Glucose is a simple sugar and is a fundamental component of carbohydrates.
Carbohydrates serve as the body's primary source of energy, with glucose being the most
common monosaccharide.
Quick Tip: Glucose is a key energy source for your body, and it’s found in carbohydrates!
Question 2:
Why are bacteria and cyanobacteria often grouped together?
• A) Both are gymnosperms
• ✅ B) Both are prokaryotes
• C) Both are autotrophs
• D) Both are pathogens
Correct Answer: B. Both are prokaryotes
Rationale: Bacteria and cyanobacteria are both classified as prokaryotes because they lack a
distinct nucleus and other membrane-bound organelles, which sets them apart from eukaryotic
organisms.
Quick Tip: Prokaryotes don't have a nucleus—this common characteristic unites bacteria and
cyanobacteria!
, Question 3:
Why do we perceive chlorophyll as green?
• A) It absorbs yellow and blue light.
• B) It primarily absorbs green light.
• ✅ C) It fails to absorb green light.
• D) It primarily absorbs red light.
Correct Answer: C. It fails to absorb green light.
Rationale: Chlorophyll absorbs red and blue light for photosynthesis but reflects green light,
making it appear green to the human eye.
Quick Tip: Chlorophyll reflects green light, making plants look green!
Question 4:
Which is not a step in the water cycle?
• A) Condensation
• B) Transpiration
• ✅ C) Nitrification
• D) Absorption
Correct Answer: C. Nitrification
Rationale: Nitrification is part of the nitrogen cycle, not the water cycle. The water cycle
involves processes such as condensation, transpiration, and absorption.
Quick Tip: The water cycle involves water-related processes, while nitrification deals with
nitrogen!
Question 5:
How should a researcher test the hypothesis that eating chocolate leads to acne in
teenagers?
• A) Take 100 teenagers and feed each one a different amount of chocolate daily for 60
days; then test for acne.
QUESTIONS & ANSWERS TO BOOST YOUR SCORE LATEST UPDATE
Question 1:
Which of the following molecules contains glucose?
• A) Proteins
• B) Lipids
• C) Nucleic acids
• ✅ D) Carbohydrates
Correct Answer: D. Carbohydrates
Rationale: Glucose is a simple sugar and is a fundamental component of carbohydrates.
Carbohydrates serve as the body's primary source of energy, with glucose being the most
common monosaccharide.
Quick Tip: Glucose is a key energy source for your body, and it’s found in carbohydrates!
Question 2:
Why are bacteria and cyanobacteria often grouped together?
• A) Both are gymnosperms
• ✅ B) Both are prokaryotes
• C) Both are autotrophs
• D) Both are pathogens
Correct Answer: B. Both are prokaryotes
Rationale: Bacteria and cyanobacteria are both classified as prokaryotes because they lack a
distinct nucleus and other membrane-bound organelles, which sets them apart from eukaryotic
organisms.
Quick Tip: Prokaryotes don't have a nucleus—this common characteristic unites bacteria and
cyanobacteria!
, Question 3:
Why do we perceive chlorophyll as green?
• A) It absorbs yellow and blue light.
• B) It primarily absorbs green light.
• ✅ C) It fails to absorb green light.
• D) It primarily absorbs red light.
Correct Answer: C. It fails to absorb green light.
Rationale: Chlorophyll absorbs red and blue light for photosynthesis but reflects green light,
making it appear green to the human eye.
Quick Tip: Chlorophyll reflects green light, making plants look green!
Question 4:
Which is not a step in the water cycle?
• A) Condensation
• B) Transpiration
• ✅ C) Nitrification
• D) Absorption
Correct Answer: C. Nitrification
Rationale: Nitrification is part of the nitrogen cycle, not the water cycle. The water cycle
involves processes such as condensation, transpiration, and absorption.
Quick Tip: The water cycle involves water-related processes, while nitrification deals with
nitrogen!
Question 5:
How should a researcher test the hypothesis that eating chocolate leads to acne in
teenagers?
• A) Take 100 teenagers and feed each one a different amount of chocolate daily for 60
days; then test for acne.
