5236 Biology -Praxis Exam Test
Questions and All Correct Answers
2026 Updated.
What is Interphase? - Answer - mainly growth of a cell occurs in this phase rather than cell
division
- most cells live here
- except cancer
What is Mitosis? - Answer active cell division
What is the G1 phase (growth phase)? - Answer - Occurs within interphase
- most of cell's life
- more organelles & proteins
What is the S phase (synthesis)? - Answer -DNA replication
of 23 pairs (half from mom & half from dad)
- results in 46 pairs
What is the G2 Phase (Growth Phase 2)? - Answer -more directly preparing for M
-make microtubules
What is the G0 phase? - Answer -no more cell division
- cells just grow
- ex. neuron
What is a Niche? - Answer An organism's particular role in an ecosystem, or how it makes its
living.
What is an Ecosystem? - Answer A biological community of interacting organisms and their
physical environment.
What is Abiotic? - Answer Non-living things
What is Biotic? - Answer living things
,What is a Biome? - Answer A group of ecosystems with similar climates and organisms
What is a Community? - Answer All the different populations that live together in an area
What is a Species? - Answer A group of similar organisms that can breed and produce fertile
offspring.
What is Binary fission? - Answer A form of asexual reproduction in single-celled organisms by
which one cell divides into two cells of the same size (usually in prokaryotes)
What is External fertilization? - Answer Fertilization that occurs outside the body of an
organism. The sperms and eggs are released in an external environment. Usually requires a
body of water
Who is Antoni van Leeuwenhoek? - Answer He discovered both protists and bacteria.
Advancing the field of microscopy through the discovery of microorganisms.
What is Commensalism? - Answer A relationship between two organisms in which one
organism benefits and the other is unaffected
What is Mimicry? - Answer The resemblance of one species to another species
What is Mutualism? - Answer A relationship between two species in which both species
benefit (symbiotic relationship)
What is Parasitism? - Answer A relationship between two organisms of different species
where one benefits and the other is harmed
What are three essential elements for plant growth that are obtained primarily through the
roots? - Answer - Magnesium
- Nitrogen
- Potassium
What is Intraspecific competition? - Answer Competition between members of the same
species. Ex: Two male red deer in competition for a mate
What are the Significant Figure Rules? - Answer 1. non-zeros are always significant
, 2. zeros between two other sig figs are significant
3. all final zeros after the decimal point are significant
4. zeros used solely for spacing the decimal point are not significant unless a decimal point is
present
What are the 8 levels of Taxonomic Hierarchy? (Hint: Dear King Phillip Came Over For Great
Soup) - Answer Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
Mammals, reptiles, birds, and fish all belong to the same... - Answer Phylum: Chordata
(Backbone)
What is Trisomy? - Answer A condition in which an extra copy of a chromosome is present in
the cell nuclei, causing developmental abnormalities.
What is Chromatography? - Answer A technique that is used to separate the components of
a mixture based on the tendency of each component to travel or be drawn across the surface of
another material. (Separating pigments from plant leaves)
What is Meristem? - Answer Undifferentiated plant tissue from which new cells are formed
to enable growth
What are Density-independent factors? - Answer Limiting factor that affects all populations
in similar ways, regardless of population size ( Ex: food or nutrient limitation, climate extremes,
seasonal cycles, catastrophic factors such as hurricanes, droughts, or fires)
What are two examples of positive feedback loops? - Answer Breastfeeding and oxytocin
The role of denitrifying bacteria in the nitrogen cycle is to _______ - Answer Convert nitrate
to molecular nitrogen
What are Guard cells? - Answer Guard cells change shape to open or close the stoma to
regulate water loss by evaporation.
What is ecological succession? - Answer Series of gradual changes that occur in a community
following a disturbance
In humans, deoxygenated blood enters the right heart through the ______ - Answer venae
cavae
Questions and All Correct Answers
2026 Updated.
What is Interphase? - Answer - mainly growth of a cell occurs in this phase rather than cell
division
- most cells live here
- except cancer
What is Mitosis? - Answer active cell division
What is the G1 phase (growth phase)? - Answer - Occurs within interphase
- most of cell's life
- more organelles & proteins
What is the S phase (synthesis)? - Answer -DNA replication
of 23 pairs (half from mom & half from dad)
- results in 46 pairs
What is the G2 Phase (Growth Phase 2)? - Answer -more directly preparing for M
-make microtubules
What is the G0 phase? - Answer -no more cell division
- cells just grow
- ex. neuron
What is a Niche? - Answer An organism's particular role in an ecosystem, or how it makes its
living.
What is an Ecosystem? - Answer A biological community of interacting organisms and their
physical environment.
What is Abiotic? - Answer Non-living things
What is Biotic? - Answer living things
,What is a Biome? - Answer A group of ecosystems with similar climates and organisms
What is a Community? - Answer All the different populations that live together in an area
What is a Species? - Answer A group of similar organisms that can breed and produce fertile
offspring.
What is Binary fission? - Answer A form of asexual reproduction in single-celled organisms by
which one cell divides into two cells of the same size (usually in prokaryotes)
What is External fertilization? - Answer Fertilization that occurs outside the body of an
organism. The sperms and eggs are released in an external environment. Usually requires a
body of water
Who is Antoni van Leeuwenhoek? - Answer He discovered both protists and bacteria.
Advancing the field of microscopy through the discovery of microorganisms.
What is Commensalism? - Answer A relationship between two organisms in which one
organism benefits and the other is unaffected
What is Mimicry? - Answer The resemblance of one species to another species
What is Mutualism? - Answer A relationship between two species in which both species
benefit (symbiotic relationship)
What is Parasitism? - Answer A relationship between two organisms of different species
where one benefits and the other is harmed
What are three essential elements for plant growth that are obtained primarily through the
roots? - Answer - Magnesium
- Nitrogen
- Potassium
What is Intraspecific competition? - Answer Competition between members of the same
species. Ex: Two male red deer in competition for a mate
What are the Significant Figure Rules? - Answer 1. non-zeros are always significant
, 2. zeros between two other sig figs are significant
3. all final zeros after the decimal point are significant
4. zeros used solely for spacing the decimal point are not significant unless a decimal point is
present
What are the 8 levels of Taxonomic Hierarchy? (Hint: Dear King Phillip Came Over For Great
Soup) - Answer Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
Mammals, reptiles, birds, and fish all belong to the same... - Answer Phylum: Chordata
(Backbone)
What is Trisomy? - Answer A condition in which an extra copy of a chromosome is present in
the cell nuclei, causing developmental abnormalities.
What is Chromatography? - Answer A technique that is used to separate the components of
a mixture based on the tendency of each component to travel or be drawn across the surface of
another material. (Separating pigments from plant leaves)
What is Meristem? - Answer Undifferentiated plant tissue from which new cells are formed
to enable growth
What are Density-independent factors? - Answer Limiting factor that affects all populations
in similar ways, regardless of population size ( Ex: food or nutrient limitation, climate extremes,
seasonal cycles, catastrophic factors such as hurricanes, droughts, or fires)
What are two examples of positive feedback loops? - Answer Breastfeeding and oxytocin
The role of denitrifying bacteria in the nitrogen cycle is to _______ - Answer Convert nitrate
to molecular nitrogen
What are Guard cells? - Answer Guard cells change shape to open or close the stoma to
regulate water loss by evaporation.
What is ecological succession? - Answer Series of gradual changes that occur in a community
following a disturbance
In humans, deoxygenated blood enters the right heart through the ______ - Answer venae
cavae
