Hesi A2 Biology Practice Questions and
Answers
Which organelle is responsible for protein synthesis? - ANSWER Ribosome
Why is yeast used to make bread rise? - ANSWER Yeast carries out fermentation,
producing ethanol and carbon dioxide
How is mitosis different from meiosis? - ANSWER 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? - ANSWER DNA
What is single stranded? - ANSWER RNA
What contains uracil? - ANSWER RNA
What codes for proteins? - ANSWER 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? - ANSWER 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? - ANSWER It will swell
and probably burst/hypotonic situation
What is the purpose of phloem tissue in plant stems? - ANSWER 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 - ANSWER 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? -
ANSWER Stamen (male reproductive organ)
What kind of symbiosis exists between a pneumonia bacterium and a human? -
ANSWER Parasitism, one organism benefits off another
, The scientific name for a house cat is Felis catus. This indicates the house cats what? -
ANSWER 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? - ANSWER Lipid, waxes oils and fats
are lipids
What takes place in a lysosome? - ANSWER 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? - ANSWER Salmonella
In which phase of cell division do the chromosomes replicate? - ANSWER 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? - ANSWER
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? - ANSWER 1 female: 0 male
What is represented by this formula 6CO2+6H2O=>C6H12O6+6O2 - ANSWER
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? - ANSWER Precise
What is the energy pyramid? - ANSWER Producers>primary consumers>secondary
consumers>decomposers
Which is not a step in the water cycle? - ANSWER Nitrification(nitrogen cycle)
Steps
Condensation(gas to liquid)
Answers
Which organelle is responsible for protein synthesis? - ANSWER Ribosome
Why is yeast used to make bread rise? - ANSWER Yeast carries out fermentation,
producing ethanol and carbon dioxide
How is mitosis different from meiosis? - ANSWER 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? - ANSWER DNA
What is single stranded? - ANSWER RNA
What contains uracil? - ANSWER RNA
What codes for proteins? - ANSWER 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? - ANSWER 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? - ANSWER It will swell
and probably burst/hypotonic situation
What is the purpose of phloem tissue in plant stems? - ANSWER 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 - ANSWER 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? -
ANSWER Stamen (male reproductive organ)
What kind of symbiosis exists between a pneumonia bacterium and a human? -
ANSWER Parasitism, one organism benefits off another
, The scientific name for a house cat is Felis catus. This indicates the house cats what? -
ANSWER 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? - ANSWER Lipid, waxes oils and fats
are lipids
What takes place in a lysosome? - ANSWER 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? - ANSWER Salmonella
In which phase of cell division do the chromosomes replicate? - ANSWER 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? - ANSWER
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? - ANSWER 1 female: 0 male
What is represented by this formula 6CO2+6H2O=>C6H12O6+6O2 - ANSWER
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? - ANSWER Precise
What is the energy pyramid? - ANSWER Producers>primary consumers>secondary
consumers>decomposers
Which is not a step in the water cycle? - ANSWER Nitrification(nitrogen cycle)
Steps
Condensation(gas to liquid)
