HESI A2 Biology/49 Questions and Correct
Answers (Graded A+)
What happens to glucose during glycolysis? -ANS- It splits into molecules of pyruvic
acid
What process do cells in the tip of a plants roots undergo to increase in number? -ANS-
Mitosis
How do RNA and DNA derive their names? -ANS- From the sugar each contains
If a disease is carried on the dominant allele, only the aa combination of recessive
genes represents a disease free offspring. -ANS- 1 out of 4 or 25% are predicted to be
disease free
What is single stranded? -ANS- RNA
What contains uracil? -ANS- RNA
What codes for proteins? -ANS- DNA
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? -ANS- 50 percent
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? -ANS- It will swell and
probably burst/hypotonic situation
What is the purpose of phloem tissue in plant stems? -ANS- It conducts food throughout
the plant, it is the system of narrow tubes that transports sugars and other nutrients
Physical factors such as temperature and pH can alter enzyme activity because they
have an effect on the enzyme's -ANS- Shape, the shape of an enzyme controls it's fit
with its substrate.
Which part of a plants reproductive system is of a different gender than others? -ANS-
Stamen (male reproductive organ)
What kind of symbiosis exists between a pneumonia bacterium and a human? -ANS-
Parasitism, one organism benefits off another
The scientific name for a house cat is Felis catus. This indicates the house cats what? -
ANS- Genus; species
, Kingdom/animalia
Phylum/Chordata
Class/mammalia
Order/carnivora
Family/felidae
Genus/ Felis
Species/catus
Beeswax is an example of what kind of molecule? -ANS- Lipid, waxes oils and fats are
lipids
What takes place in a lysosome? -ANS- Food is digested, the lysosome contains
digestive enzymes. The job of a lysosome is to digest food for cells and break down
cells waste products
Which organism reproduces via binary fission? -ANS- Salmonella
In which phase of cell division do the chromosomes replicate? -ANS- Interphase-active
phase of a cells reproductive life, the cell produces nucleic acids and proteins and
doubled its # of chromosomes
In a strand of DNA, you would expect to see adenine paired with? -ANS-
Thymine/adenine
Cytosine/guanine
Hemophilia is a sex linked trait carried on the X chromosome. In an example of a male
with hemophilia and a female carrier, what ratio of the offspring is predicted to have the
disease? -ANS- 1 female: 0 male
What is represented by this formula 6CO2+6H2O=>C6H12O6+6O2 -ANS-
Photosynthesis, carbon dioxide pairing with water to form a simple sugar and oxygen
3 students measured the mass of a product of combustion. They recorded
measurements of 5.14g 5.16g and 5.17g if the known mass of the product is 5.30g how
would you describe the students measurements? -ANS- Precise
Which organelle is responsible for protein synthesis? -ANS- Ribosome
Why is yeast used to make bread rise? -ANS- Yeast carries out fermentation, producing
ethanol and carbon dioxide
How is mitosis different from meiosis? -ANS- 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
What can be altered? -ANS- DNA
Answers (Graded A+)
What happens to glucose during glycolysis? -ANS- It splits into molecules of pyruvic
acid
What process do cells in the tip of a plants roots undergo to increase in number? -ANS-
Mitosis
How do RNA and DNA derive their names? -ANS- From the sugar each contains
If a disease is carried on the dominant allele, only the aa combination of recessive
genes represents a disease free offspring. -ANS- 1 out of 4 or 25% are predicted to be
disease free
What is single stranded? -ANS- RNA
What contains uracil? -ANS- RNA
What codes for proteins? -ANS- DNA
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? -ANS- 50 percent
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? -ANS- It will swell and
probably burst/hypotonic situation
What is the purpose of phloem tissue in plant stems? -ANS- It conducts food throughout
the plant, it is the system of narrow tubes that transports sugars and other nutrients
Physical factors such as temperature and pH can alter enzyme activity because they
have an effect on the enzyme's -ANS- Shape, the shape of an enzyme controls it's fit
with its substrate.
Which part of a plants reproductive system is of a different gender than others? -ANS-
Stamen (male reproductive organ)
What kind of symbiosis exists between a pneumonia bacterium and a human? -ANS-
Parasitism, one organism benefits off another
The scientific name for a house cat is Felis catus. This indicates the house cats what? -
ANS- Genus; species
, Kingdom/animalia
Phylum/Chordata
Class/mammalia
Order/carnivora
Family/felidae
Genus/ Felis
Species/catus
Beeswax is an example of what kind of molecule? -ANS- Lipid, waxes oils and fats are
lipids
What takes place in a lysosome? -ANS- Food is digested, the lysosome contains
digestive enzymes. The job of a lysosome is to digest food for cells and break down
cells waste products
Which organism reproduces via binary fission? -ANS- Salmonella
In which phase of cell division do the chromosomes replicate? -ANS- Interphase-active
phase of a cells reproductive life, the cell produces nucleic acids and proteins and
doubled its # of chromosomes
In a strand of DNA, you would expect to see adenine paired with? -ANS-
Thymine/adenine
Cytosine/guanine
Hemophilia is a sex linked trait carried on the X chromosome. In an example of a male
with hemophilia and a female carrier, what ratio of the offspring is predicted to have the
disease? -ANS- 1 female: 0 male
What is represented by this formula 6CO2+6H2O=>C6H12O6+6O2 -ANS-
Photosynthesis, carbon dioxide pairing with water to form a simple sugar and oxygen
3 students measured the mass of a product of combustion. They recorded
measurements of 5.14g 5.16g and 5.17g if the known mass of the product is 5.30g how
would you describe the students measurements? -ANS- Precise
Which organelle is responsible for protein synthesis? -ANS- Ribosome
Why is yeast used to make bread rise? -ANS- Yeast carries out fermentation, producing
ethanol and carbon dioxide
How is mitosis different from meiosis? -ANS- 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
What can be altered? -ANS- DNA
