PRAXIS BIOLOGY CONTENT
KNOWLEDGE (5236) EXAM
QUESTIONS AND ANSWERS
Which of the following are unique to prokaryotic cells? - Correct Answers -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? - Correct Answers -
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? -
Correct Answers -Facilitating 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? - Correct Answers -2n, double the interphase amount of DNA
Placing human muscle cell in salt water would cause which of the following? - Correct
Answers -The 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? - Correct Answers -3' carbon of the first nucleotide is linked to the 5' carbon of
the second nucleotide
The dependent variable - Correct Answers -the variable that is observed (in this case,
the number of heart beats per minute)
Ludwig Boltzmann and James Maxwell - Correct Answers -created the theory of
statistical mechanics; it explains heat in terms of numerical behavior of atoms &
molecules
, A biohazard bag in a container needs to be emptied. How full is it - Correct Answers -It
is three-fourths full
Which of the following is not a condition for natural selection? - Correct Answers -Alleles
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? - Correct Answers -
The chemical changed from red to blue
Which of the following are not homologous structures? - Correct Answers -an 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? - Correct Answers -Pleiotropy;
Pleiotropic genes affect multiple traits that seem to be unrelated
What is the function of nucleosomes? - Correct Answers -They 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: - Correct
Answers -Commensalism
Amensalism - Correct Answers -Can 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? - Correct Answers -Genetic equilibrium
Which of the following levels of organization is correct? - Correct Answers -Organs
make up organ systems
Which of the following is found in both prokaryotes and eukaryotes? - Correct Answers -
Ribosomes
In which phase of mitosis do the chromosomes line up in the middle of the cells? -
Correct Answers -Metaphase
KNOWLEDGE (5236) EXAM
QUESTIONS AND ANSWERS
Which of the following are unique to prokaryotic cells? - Correct Answers -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? - Correct Answers -
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? -
Correct Answers -Facilitating 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? - Correct Answers -2n, double the interphase amount of DNA
Placing human muscle cell in salt water would cause which of the following? - Correct
Answers -The 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? - Correct Answers -3' carbon of the first nucleotide is linked to the 5' carbon of
the second nucleotide
The dependent variable - Correct Answers -the variable that is observed (in this case,
the number of heart beats per minute)
Ludwig Boltzmann and James Maxwell - Correct Answers -created the theory of
statistical mechanics; it explains heat in terms of numerical behavior of atoms &
molecules
, A biohazard bag in a container needs to be emptied. How full is it - Correct Answers -It
is three-fourths full
Which of the following is not a condition for natural selection? - Correct Answers -Alleles
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? - Correct Answers -
The chemical changed from red to blue
Which of the following are not homologous structures? - Correct Answers -an 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? - Correct Answers -Pleiotropy;
Pleiotropic genes affect multiple traits that seem to be unrelated
What is the function of nucleosomes? - Correct Answers -They 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: - Correct
Answers -Commensalism
Amensalism - Correct Answers -Can 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? - Correct Answers -Genetic equilibrium
Which of the following levels of organization is correct? - Correct Answers -Organs
make up organ systems
Which of the following is found in both prokaryotes and eukaryotes? - Correct Answers -
Ribosomes
In which phase of mitosis do the chromosomes line up in the middle of the cells? -
Correct Answers -Metaphase
