HESI A2 Biology Practice Questions and Verified Answers 2025
1. Which organelle is responsible for protein synthesis?: Ribosome
2. Why is yeast used to make bread rise?: Yeast carries out fermentation, produc- ing ethanol
and carbon dioxide
3. How is mitosis different from meiosis?: Meiosis creates sex cells with half the # of
chromosomes of the parent cell where as mitosis creates cells that are exact copies of each
other, down to the number of chromosomes
4. What can be altered?: DNA
5. What is single stranded?: RNA
6. What contains uracil?: RNA
7. What codes for proteins?: DNA
8. Imagine that two parents both carry the recessive gene for cystic fibro- sis. Any
homozygous recessive offspring will manifest the disease. What percentage of the
offspring is predicted to be carriers but not manifest the disease?: 50 percent
9. A cell is in a solution in which the concentration of solutes is higher inside the cell than
outside the cell. What would you expect to happen to the cell?: It will swell and probably
burst/hypotonic situation
10. What is the purpose of phloem tissue in plant stems?: It conducts food throughout
the plant, it is the system of narrow tubes that transports sugars and other nutrients
11. Physical factors such as temperature and pH can alter enzyme activity because they
have an effect on the enzyme's: Shape, the shape of an enzyme controls it's fit with its
substrate.
12. Which part of a plants reproductive system is of a different gender than others?:
1/9
, Stamen (male reproductive organ)
13. What kind of symbiosis exists between a pneumonia bacterium and a human?:
Parasitism, one organism benefits off another
14. The scientific name for a house cat is Felis catus.This indicates the house cats what?:
Genus; species
Kingdom/animalia
Phylum/Chordata
Class/mammalia
Order/carnivora
Family/felidae Genus/
Felis Species/catus
15. Beeswax is an example of what kind of molecule?: Lipid, waxes oils and fats are lipids
2/9
1. Which organelle is responsible for protein synthesis?: Ribosome
2. Why is yeast used to make bread rise?: Yeast carries out fermentation, produc- ing ethanol
and carbon dioxide
3. How is mitosis different from meiosis?: Meiosis creates sex cells with half the # of
chromosomes of the parent cell where as mitosis creates cells that are exact copies of each
other, down to the number of chromosomes
4. What can be altered?: DNA
5. What is single stranded?: RNA
6. What contains uracil?: RNA
7. What codes for proteins?: DNA
8. Imagine that two parents both carry the recessive gene for cystic fibro- sis. Any
homozygous recessive offspring will manifest the disease. What percentage of the
offspring is predicted to be carriers but not manifest the disease?: 50 percent
9. A cell is in a solution in which the concentration of solutes is higher inside the cell than
outside the cell. What would you expect to happen to the cell?: It will swell and probably
burst/hypotonic situation
10. What is the purpose of phloem tissue in plant stems?: It conducts food throughout
the plant, it is the system of narrow tubes that transports sugars and other nutrients
11. Physical factors such as temperature and pH can alter enzyme activity because they
have an effect on the enzyme's: Shape, the shape of an enzyme controls it's fit with its
substrate.
12. Which part of a plants reproductive system is of a different gender than others?:
1/9
, Stamen (male reproductive organ)
13. What kind of symbiosis exists between a pneumonia bacterium and a human?:
Parasitism, one organism benefits off another
14. The scientific name for a house cat is Felis catus.This indicates the house cats what?:
Genus; species
Kingdom/animalia
Phylum/Chordata
Class/mammalia
Order/carnivora
Family/felidae Genus/
Felis Species/catus
15. Beeswax is an example of what kind of molecule?: Lipid, waxes oils and fats are lipids
2/9
