SAT CEOE CSS BIOLOGY CONCEPTS EXAM 2025 | 177 QUESTIONS WITH 100%
ACCURATE SOLUTIONS
1. Which of the following is TRUE?
Maintenance of blood glucose at homeostatic levels is an
example of negative feedback
The number of negative feedback systems in the body is much less
than the number of positive feedback systems in the body
Positive feedback is always harmful to one's health
Positive feedback is never harmful to one's health
2. In a new ecosystem, researchers observe that the interactions between
different species lead to unexpected behaviors, such as cooperative
hunting. What concept does this illustrate?
emergent properties
positive feedback loops
efficient energy conversion
boundary maintenance
3. Which of the following organisms is classified as a suspension feeder?
Clams
Sharks
Tigers
Eagles
4. Which biological concept is best illustrated using a physical model in the
classroom?
,Construction of a DNA model
, Dimensions of an ecological niche
Construction of a Punnett square
Configuration of the genetic code
5. An ecosystem has an ecological efficiency of 10 percent. If the producer
level contains 10,000 kilocalories of energy, how much energy does the
tertiary consumer level contain?
1 kcal
10 kcal
100 kcal
1000 kcal
10,000 kcal
6. Describe how the establishment of exotic species can lead to loss of
biodiversity in island ecosystems.
Exotic species can outcompete native species for resources,
leading to a decline in native populations and overall
biodiversity.
Exotic species enhance biodiversity by introducing new genetic
material.
Exotic species have no impact on native species in isolated
ecosystems.
Exotic species only affect the physical environment, not the
biological diversity.
7. Describe the role of starch in plants and how it contributes to their
energy needs.
Starch serves as a storage form of energy in plants, allowing
them to access glucose when needed for growth and
metabolism.
, Starch is a structural component that provides rigidity to plant
cells.
Starch is a type of protein that aids in photosynthesis.
Starch is a waste product of plant metabolism.
8. A karyotype can be used to___ _.
identify changes in chromosome number and/or structure
associated with a disease condition
detect a reduction in enzymatic activity due to a disease-causing
allele
determine the change in DNA sequence that converted a normal
allele to a disease-causing allele
9. If a scientist finds that water temperature does not influence frog egg-
laying, what could be a potential new hypothesis to investigate?
Other environmental factors, such as food availability or habitat
changes, may influence frog reproduction.
Higher temperatures directly cause frogs to become more active
and lay eggs.
Frog populations are only influenced by genetic factors, not
environmental ones.
The increase in frog population is solely due to a decrease in
predator numbers.
10. Which of the following functions can be attributed to nucleic acids and
nucleotides
genetic information storage and transmission
long term energy storage
chemical signaling between cells
ACCURATE SOLUTIONS
1. Which of the following is TRUE?
Maintenance of blood glucose at homeostatic levels is an
example of negative feedback
The number of negative feedback systems in the body is much less
than the number of positive feedback systems in the body
Positive feedback is always harmful to one's health
Positive feedback is never harmful to one's health
2. In a new ecosystem, researchers observe that the interactions between
different species lead to unexpected behaviors, such as cooperative
hunting. What concept does this illustrate?
emergent properties
positive feedback loops
efficient energy conversion
boundary maintenance
3. Which of the following organisms is classified as a suspension feeder?
Clams
Sharks
Tigers
Eagles
4. Which biological concept is best illustrated using a physical model in the
classroom?
,Construction of a DNA model
, Dimensions of an ecological niche
Construction of a Punnett square
Configuration of the genetic code
5. An ecosystem has an ecological efficiency of 10 percent. If the producer
level contains 10,000 kilocalories of energy, how much energy does the
tertiary consumer level contain?
1 kcal
10 kcal
100 kcal
1000 kcal
10,000 kcal
6. Describe how the establishment of exotic species can lead to loss of
biodiversity in island ecosystems.
Exotic species can outcompete native species for resources,
leading to a decline in native populations and overall
biodiversity.
Exotic species enhance biodiversity by introducing new genetic
material.
Exotic species have no impact on native species in isolated
ecosystems.
Exotic species only affect the physical environment, not the
biological diversity.
7. Describe the role of starch in plants and how it contributes to their
energy needs.
Starch serves as a storage form of energy in plants, allowing
them to access glucose when needed for growth and
metabolism.
, Starch is a structural component that provides rigidity to plant
cells.
Starch is a type of protein that aids in photosynthesis.
Starch is a waste product of plant metabolism.
8. A karyotype can be used to___ _.
identify changes in chromosome number and/or structure
associated with a disease condition
detect a reduction in enzymatic activity due to a disease-causing
allele
determine the change in DNA sequence that converted a normal
allele to a disease-causing allele
9. If a scientist finds that water temperature does not influence frog egg-
laying, what could be a potential new hypothesis to investigate?
Other environmental factors, such as food availability or habitat
changes, may influence frog reproduction.
Higher temperatures directly cause frogs to become more active
and lay eggs.
Frog populations are only influenced by genetic factors, not
environmental ones.
The increase in frog population is solely due to a decrease in
predator numbers.
10. Which of the following functions can be attributed to nucleic acids and
nucleotides
genetic information storage and transmission
long term energy storage
chemical signaling between cells
