Praxis Biology Content Knowledge
(5236)
Which of the following are unique to prokaryotic cells? - answer They have cell walls
made of peptidoglycan.
Eukaryotic cells are made of cellulose (Plants & animals) or chitin (fungi)
Only bacteria have peptidoglycan in their cell walls
A seabird that nests on tropical islands begins to separate into populations that breed at
different times. Which of the following is most likely to occur with this species of seabird
as the breeding windows become more and more distinct? - answer Populations that
don't interbreed will share fewer genetic characteristics
Capillaries are extremely thin blood vessels, and large capillary nets are found in the
lungs and in the kidneys. Which of the following is a likely function of capillaries? -
answerFacilitating diffusion with a high surface-area-to-volume ratio
Capillaries form nets with large surface areas in regions of the body that exchange
materials from the blood like the lungs and kidneys
A diploid cells undergoes meiosis. During prophase I, how much DNA is present in the
cell? - answer2n, double the interphase amount of DNA
Placing human muscle cell in salt water would cause which of the following? -
answerThe cells would shrivel (Hypertonic)
There are more solute particles outside the cell than inside the cell so water would flow
from the inside to the outside of the cell by osmosis. This would cause the cells to
shrivel
Which of the following best describes phosphodiester bonds that join DNA nucleotides
together? - answer3' carbon of the first nucleotide is linked to the 5' carbon of the
second nucleotide
Which of the following is not a condition for natural selection? - answerAlleles are
transferred from one population to another; this is called gene flow and is not needed for
natural selection
Which of the following is a valid observation in a laboratory setting? - answerThe
chemical changed from red to blue
Which of the following are not homologous structures? - answeran insect wing and a
chicken wing
, The frizzle gene in chickens produces feathers that curl outwards instead of lying flat.
Chickens that express this gene also have abnormal body temp, higher blood flow
rates, and greater digestive capacity, and they lay fewer eggs. Which of the following
best describes the effect of the frizzle gene? - answerPleiotropy;
Pleiotropic genes affect multiple traits that seem to be unrelated
What is the function of nucleosomes? - answerThey help supercoil DNA; a nucleosome
is a unit of chromatin wrapped around eight histone proteins. They help supercoil DNA
Cattle egrets are birds that live near cattle because as the cattle graze, insects in the
ground are stirred up to the surface. When the insects are stirred to the surface, the
birds eat the insects. The cattle are unaffected by the birds or the insects. This
relationship between the cattle egrets and the cattle can best be described as: -
answerCommensalism
Amensalism - answerCan happen when a bigger, more established organism out
competes a smaller organism for resources; two organism of different species where
one species is inhibited or killed and the other is unaffected
Which of the following is the most likely result from free exchange of alleles between
two schools of yellow perch in a large lake? - answerGenetic equilibrium
Which of the following levels of organization is correct? - answerOrgans make up organ
systems
Which of the following is found in both prokaryotes and eukaryotes? -
answerRibosomes
In which phase of mitosis do the chromosomes line up in the middle of the cells? -
answerMetaphase
What is the role of the promoter during RNA transcription? - answerTo bind with RNA
polymerase and begin the process of building RNA strand; promoters are located at the
beginning of the strand and begin the process of building the new RNA strand
Which of the following is true of energy pyramids? - answerEnergy pyramids show the
amount of energy at each trophic level.
Which of the following pairs of organisms lists a primary producer and a secondary
consumer in an ecosystem? - answerGrass & wolf
Which of the following types of digestive systems has only one opening? -
answergastrovascular cavity; animals such as jellyfish, anemones, and flatworms have
a gastrovascular cavity with one opening
(5236)
Which of the following are unique to prokaryotic cells? - answer They have cell walls
made of peptidoglycan.
Eukaryotic cells are made of cellulose (Plants & animals) or chitin (fungi)
Only bacteria have peptidoglycan in their cell walls
A seabird that nests on tropical islands begins to separate into populations that breed at
different times. Which of the following is most likely to occur with this species of seabird
as the breeding windows become more and more distinct? - answer Populations that
don't interbreed will share fewer genetic characteristics
Capillaries are extremely thin blood vessels, and large capillary nets are found in the
lungs and in the kidneys. Which of the following is a likely function of capillaries? -
answerFacilitating diffusion with a high surface-area-to-volume ratio
Capillaries form nets with large surface areas in regions of the body that exchange
materials from the blood like the lungs and kidneys
A diploid cells undergoes meiosis. During prophase I, how much DNA is present in the
cell? - answer2n, double the interphase amount of DNA
Placing human muscle cell in salt water would cause which of the following? -
answerThe cells would shrivel (Hypertonic)
There are more solute particles outside the cell than inside the cell so water would flow
from the inside to the outside of the cell by osmosis. This would cause the cells to
shrivel
Which of the following best describes phosphodiester bonds that join DNA nucleotides
together? - answer3' carbon of the first nucleotide is linked to the 5' carbon of the
second nucleotide
Which of the following is not a condition for natural selection? - answerAlleles are
transferred from one population to another; this is called gene flow and is not needed for
natural selection
Which of the following is a valid observation in a laboratory setting? - answerThe
chemical changed from red to blue
Which of the following are not homologous structures? - answeran insect wing and a
chicken wing
, The frizzle gene in chickens produces feathers that curl outwards instead of lying flat.
Chickens that express this gene also have abnormal body temp, higher blood flow
rates, and greater digestive capacity, and they lay fewer eggs. Which of the following
best describes the effect of the frizzle gene? - answerPleiotropy;
Pleiotropic genes affect multiple traits that seem to be unrelated
What is the function of nucleosomes? - answerThey help supercoil DNA; a nucleosome
is a unit of chromatin wrapped around eight histone proteins. They help supercoil DNA
Cattle egrets are birds that live near cattle because as the cattle graze, insects in the
ground are stirred up to the surface. When the insects are stirred to the surface, the
birds eat the insects. The cattle are unaffected by the birds or the insects. This
relationship between the cattle egrets and the cattle can best be described as: -
answerCommensalism
Amensalism - answerCan happen when a bigger, more established organism out
competes a smaller organism for resources; two organism of different species where
one species is inhibited or killed and the other is unaffected
Which of the following is the most likely result from free exchange of alleles between
two schools of yellow perch in a large lake? - answerGenetic equilibrium
Which of the following levels of organization is correct? - answerOrgans make up organ
systems
Which of the following is found in both prokaryotes and eukaryotes? -
answerRibosomes
In which phase of mitosis do the chromosomes line up in the middle of the cells? -
answerMetaphase
What is the role of the promoter during RNA transcription? - answerTo bind with RNA
polymerase and begin the process of building RNA strand; promoters are located at the
beginning of the strand and begin the process of building the new RNA strand
Which of the following is true of energy pyramids? - answerEnergy pyramids show the
amount of energy at each trophic level.
Which of the following pairs of organisms lists a primary producer and a secondary
consumer in an ecosystem? - answerGrass & wolf
Which of the following types of digestive systems has only one opening? -
answergastrovascular cavity; animals such as jellyfish, anemones, and flatworms have
a gastrovascular cavity with one opening
