HESI A2 Exam
Biology Section 2025
Actual Exam Questions
, 1. Which organelle is responsible for protein synthesis?
Answer: Ribosome
2. Why is yeast used to make bread rise?
Answer: Yeast carries out fermentation, producing ethanol and carbon dioxide.
3. How is mitosis different from meiosis?
Answer: Meiosis creates sex cells with half the number of chromosomes of the parent cell,
whereas mitosis creates cells that are exact copies of each other, down to the number of
chromosomes.
4. What can be altered?
Answer: DNA
5. What is single stranded?
Answer: RNA
6. What contains uracil?
Answer: RNA
7. What codes for proteins?
Answer: DNA
8. Imagine that two parents both carry the recessive gene for cystic fibrosis. Any
homozygous recessive offspring will manifest the disease. What percentage of the offspring
is predicted to be carriers but not manifest the disease?
Answer: 50 percent
9. We have an expert-written solution to this problem! A cell is in a solution in which the
concentration of solutes is higher inside the cell than outside the cell. What would you
Biology Section 2025
Actual Exam Questions
, 1. Which organelle is responsible for protein synthesis?
Answer: Ribosome
2. Why is yeast used to make bread rise?
Answer: Yeast carries out fermentation, producing ethanol and carbon dioxide.
3. How is mitosis different from meiosis?
Answer: Meiosis creates sex cells with half the number of chromosomes of the parent cell,
whereas mitosis creates cells that are exact copies of each other, down to the number of
chromosomes.
4. What can be altered?
Answer: DNA
5. What is single stranded?
Answer: RNA
6. What contains uracil?
Answer: RNA
7. What codes for proteins?
Answer: DNA
8. Imagine that two parents both carry the recessive gene for cystic fibrosis. Any
homozygous recessive offspring will manifest the disease. What percentage of the offspring
is predicted to be carriers but not manifest the disease?
Answer: 50 percent
9. We have an expert-written solution to this problem! A cell is in a solution in which the
concentration of solutes is higher inside the cell than outside the cell. What would you
