LSUE BIOLOGY 1001 MIDTERM EXAM EXAM QUESTIONS WITH COMPLETE
SOLUTION) (MULTIPLE CHOICES) (A+ GRADED 100% VERIFIED) LATEST VERSION 2026
Question 1
In the scientific community, what is the best definition of a "Theory"?
A) A preliminary guess that hasn't been tested yet
B) An idea that has been proven as an absolute law of nature
C) A description of a belief that invokes the supernatural
D) An explanation of an idea that is broad in scope and supported by a large body of evidence
E) A specific prediction used to test a single experiment
Correct Answer: D) an explanation of an idea that is broad in scope and supported by a
large body of evidence
Rationale: Unlike a hypothesis, which is a narrow, proposed explanation for a set of
observations, a theory is much broader and is corroborated by multiple lines of evidence
and repeated experimentation.
Question 2
Which of the following statements regarding common cellular activities is FALSE?
A) Cells respond to environmental stimuli.
B) New cells are derived from cellular components like organelles.
C) Cells regulate their internal environment.
D) Cells use DNA as their genetic information.
E) All cells are enclosed by a membrane.
Correct Answer: B) New cells are derived from cellular components like organelles
Rationale: According to Cell Theory, all cells come from pre-existing cells through the
process of cell division. They are not spontaneously assembled from individual components
like organelles.
Question 3
The broad, ridged teeth of a horse used for grinding grain versus the pointed teeth of a lion used
for ripping flesh illustrates:
A) A complex food web
B) The failure of adaptation
C) A result of natural selection and the connection between form and function
D) Genetic drift in small populations
E) Evidence of the supernatural
Correct Answer: C) a result of natural selection as well as the connection between form and
function.
Rationale: Natural selection favors traits (form) that are best suited to perform a specific
task (function) in an organism's environment, leading to evolutionary adaptations over
generations.
Question 4
Which of the following is NOT an example of evolution that has resulted from human activity?
, 2
A) Strains of bacteria becoming resistant to common antibiotics
B) Extinction of bears and wolves due to hunting
C) Domesticated strawberries being larger than wild ones
D) Insect species developing resistance to pesticides
E) High-yield wheat being produced via artificial selection
Correct Answer: B) Because of hunting, species such as bears and wolves are in danger of
extinction.
Rationale: While extinction is a result of human activity, it is not "evolution." Evolution is a
change in the genetic makeup of a population over time. Antibiotic resistance and artificial
selection are examples of genetic shifts driven by human influence.
Question 5
Which of the following statements about the properties of life is FALSE?
A) All organisms are composed of one or more cells.
B) All organisms reproduce their own kind.
C) All organisms have the ability to maintain a constant internal temperature.
D) All organisms process energy.
E) All organisms respond to environmental stimuli.
Correct Answer: C) All organisms have the ability to maintain a constant internal
temperature.
Rationale: While all life exhibits "regulation" (homeostasis), not all organisms are
endothermic. Many organisms, such as reptiles and bacteria, rely on their environment to
regulate their temperature.
Question 6
Which of the following statements about genetics is TRUE?
A) Genetic information is stored in proteins.
B) Differences among organisms reflect different types of nucleotides used in their DNA.
C) Differences among organisms reflect different nucleotide sequences in their DNA.
D) DNA is only found in eukaryotic organisms.
E) All organisms have identical DNA sequences.
Correct Answer: C) Differences among organisms reflect different nucleotide sequences in
their DNA.
Rationale: All life uses the same four nucleotides (A, T, C, G). The incredible diversity of life
is due to the specific order (sequence) in which these nucleotides are arranged.
Question 7
If an antibiotic kills 99.9% of a bacterial population, you would expect the next generation of
bacteria:
A) To die out due to a lack of genetic diversity
B) To be just as susceptible to the antibiotic as the previous generation
, 3
C) To be more resistant to that antibiotic
D) To be more contagious but less deadly
E) To stop reproducing entirely
Correct Answer: C) To be more resistant to that antibiotic.
Rationale: The 0.1% that survived likely possess a genetic mutation that allows them to
withstand the antibiotic. These survivors will pass those resistant genes to their offspring,
leading to a resistant population.
Question 8
You notice many students wearing a new style of sweatshirt and think the bookstore might have
started selling them. This specific, proposed explanation is an example of a:
A) Theory
B) Conclusion
C) Scientific Law
D) Hypothesis
E) Control Group
Correct Answer: D) Hypothesis
Rationale: A hypothesis is a tentative explanation for a specific observation that can be
tested through further investigation.
Question 9
Which of the following is a kingdom within the domain Eukarya?
A) Bacteria
B) Archaea
C) Fungi
D) Viruses
E) Prokarya
Correct Answer: C) Fungi
Rationale: Domain Eukarya includes the kingdoms Plantae, Animalia, Fungi, and the
various groups formerly known as Protists. Bacteria and Archaea are their own separate
domains.
Question 10
Which of the following statements about evolution is TRUE?
A) Evolution is a deliberate process aimed at perfection.
B) Evolution can result in adaptations.
C) Individuals evolve during their own lifetimes.
D) Evolution only happens in animals, not plants.
E) Evolution is an idea that has been proven and is now a law.
Correct Answer: B) Evolution can result in adaptations
Rationale: Evolution is the process of change over time that can lead to adaptations—
, 4
inherited traits that enhance an organism's ability to survive and reproduce in a specific
environment.
Question 11
Kingdom Fungi includes species that obtain food primarily by:
A) Ingesting other living organisms
B) Using photosynthesis to create sugar
C) Decomposing dead organisms and absorbing the nutrients
D) Absorbing energy directly from the sun without pigments
E) Hunting in large groups
Correct Answer: C) That obtain food by decomposing dead organisms and absorbing the
nutrients
Rationale: Fungi are absorptive heterotrophs. They secrete enzymes to break down organic
matter outside their bodies and then absorb the simplified nutrients.
Question 12
Which type of bond accounts for water's high surface tension and significant heat storage
capacity?
A) Covalent bonds
B) Ionic bonds
C) Hydrogen bonds
D) Non-polar bonds
E) Double oxygen bonds
Correct Answer: C) Hydrogen bonds
Rationale: Water is a polar molecule. The attraction between the slightly positive hydrogen
of one molecule and the slightly negative oxygen of another creates hydrogen bonds, which
give water its unique cohesive and thermal properties.
Question 13
What happens to the chemical structure of water as ice melts?
A) Covalent bonds are formed
B) Hydrogen bonds are broken
C) Atoms are destroyed
D) Water molecules become less dense
E) The oxygen atoms gain electrons
Correct Answer: B) Hydrogen bonds are broken
Rationale: In ice, water molecules are held in a rigid lattice by stable hydrogen bonds. As
energy (heat) is added, these bonds break, allowing the molecules to slip past each other in
liquid form.
SOLUTION) (MULTIPLE CHOICES) (A+ GRADED 100% VERIFIED) LATEST VERSION 2026
Question 1
In the scientific community, what is the best definition of a "Theory"?
A) A preliminary guess that hasn't been tested yet
B) An idea that has been proven as an absolute law of nature
C) A description of a belief that invokes the supernatural
D) An explanation of an idea that is broad in scope and supported by a large body of evidence
E) A specific prediction used to test a single experiment
Correct Answer: D) an explanation of an idea that is broad in scope and supported by a
large body of evidence
Rationale: Unlike a hypothesis, which is a narrow, proposed explanation for a set of
observations, a theory is much broader and is corroborated by multiple lines of evidence
and repeated experimentation.
Question 2
Which of the following statements regarding common cellular activities is FALSE?
A) Cells respond to environmental stimuli.
B) New cells are derived from cellular components like organelles.
C) Cells regulate their internal environment.
D) Cells use DNA as their genetic information.
E) All cells are enclosed by a membrane.
Correct Answer: B) New cells are derived from cellular components like organelles
Rationale: According to Cell Theory, all cells come from pre-existing cells through the
process of cell division. They are not spontaneously assembled from individual components
like organelles.
Question 3
The broad, ridged teeth of a horse used for grinding grain versus the pointed teeth of a lion used
for ripping flesh illustrates:
A) A complex food web
B) The failure of adaptation
C) A result of natural selection and the connection between form and function
D) Genetic drift in small populations
E) Evidence of the supernatural
Correct Answer: C) a result of natural selection as well as the connection between form and
function.
Rationale: Natural selection favors traits (form) that are best suited to perform a specific
task (function) in an organism's environment, leading to evolutionary adaptations over
generations.
Question 4
Which of the following is NOT an example of evolution that has resulted from human activity?
, 2
A) Strains of bacteria becoming resistant to common antibiotics
B) Extinction of bears and wolves due to hunting
C) Domesticated strawberries being larger than wild ones
D) Insect species developing resistance to pesticides
E) High-yield wheat being produced via artificial selection
Correct Answer: B) Because of hunting, species such as bears and wolves are in danger of
extinction.
Rationale: While extinction is a result of human activity, it is not "evolution." Evolution is a
change in the genetic makeup of a population over time. Antibiotic resistance and artificial
selection are examples of genetic shifts driven by human influence.
Question 5
Which of the following statements about the properties of life is FALSE?
A) All organisms are composed of one or more cells.
B) All organisms reproduce their own kind.
C) All organisms have the ability to maintain a constant internal temperature.
D) All organisms process energy.
E) All organisms respond to environmental stimuli.
Correct Answer: C) All organisms have the ability to maintain a constant internal
temperature.
Rationale: While all life exhibits "regulation" (homeostasis), not all organisms are
endothermic. Many organisms, such as reptiles and bacteria, rely on their environment to
regulate their temperature.
Question 6
Which of the following statements about genetics is TRUE?
A) Genetic information is stored in proteins.
B) Differences among organisms reflect different types of nucleotides used in their DNA.
C) Differences among organisms reflect different nucleotide sequences in their DNA.
D) DNA is only found in eukaryotic organisms.
E) All organisms have identical DNA sequences.
Correct Answer: C) Differences among organisms reflect different nucleotide sequences in
their DNA.
Rationale: All life uses the same four nucleotides (A, T, C, G). The incredible diversity of life
is due to the specific order (sequence) in which these nucleotides are arranged.
Question 7
If an antibiotic kills 99.9% of a bacterial population, you would expect the next generation of
bacteria:
A) To die out due to a lack of genetic diversity
B) To be just as susceptible to the antibiotic as the previous generation
, 3
C) To be more resistant to that antibiotic
D) To be more contagious but less deadly
E) To stop reproducing entirely
Correct Answer: C) To be more resistant to that antibiotic.
Rationale: The 0.1% that survived likely possess a genetic mutation that allows them to
withstand the antibiotic. These survivors will pass those resistant genes to their offspring,
leading to a resistant population.
Question 8
You notice many students wearing a new style of sweatshirt and think the bookstore might have
started selling them. This specific, proposed explanation is an example of a:
A) Theory
B) Conclusion
C) Scientific Law
D) Hypothesis
E) Control Group
Correct Answer: D) Hypothesis
Rationale: A hypothesis is a tentative explanation for a specific observation that can be
tested through further investigation.
Question 9
Which of the following is a kingdom within the domain Eukarya?
A) Bacteria
B) Archaea
C) Fungi
D) Viruses
E) Prokarya
Correct Answer: C) Fungi
Rationale: Domain Eukarya includes the kingdoms Plantae, Animalia, Fungi, and the
various groups formerly known as Protists. Bacteria and Archaea are their own separate
domains.
Question 10
Which of the following statements about evolution is TRUE?
A) Evolution is a deliberate process aimed at perfection.
B) Evolution can result in adaptations.
C) Individuals evolve during their own lifetimes.
D) Evolution only happens in animals, not plants.
E) Evolution is an idea that has been proven and is now a law.
Correct Answer: B) Evolution can result in adaptations
Rationale: Evolution is the process of change over time that can lead to adaptations—
, 4
inherited traits that enhance an organism's ability to survive and reproduce in a specific
environment.
Question 11
Kingdom Fungi includes species that obtain food primarily by:
A) Ingesting other living organisms
B) Using photosynthesis to create sugar
C) Decomposing dead organisms and absorbing the nutrients
D) Absorbing energy directly from the sun without pigments
E) Hunting in large groups
Correct Answer: C) That obtain food by decomposing dead organisms and absorbing the
nutrients
Rationale: Fungi are absorptive heterotrophs. They secrete enzymes to break down organic
matter outside their bodies and then absorb the simplified nutrients.
Question 12
Which type of bond accounts for water's high surface tension and significant heat storage
capacity?
A) Covalent bonds
B) Ionic bonds
C) Hydrogen bonds
D) Non-polar bonds
E) Double oxygen bonds
Correct Answer: C) Hydrogen bonds
Rationale: Water is a polar molecule. The attraction between the slightly positive hydrogen
of one molecule and the slightly negative oxygen of another creates hydrogen bonds, which
give water its unique cohesive and thermal properties.
Question 13
What happens to the chemical structure of water as ice melts?
A) Covalent bonds are formed
B) Hydrogen bonds are broken
C) Atoms are destroyed
D) Water molecules become less dense
E) The oxygen atoms gain electrons
Correct Answer: B) Hydrogen bonds are broken
Rationale: In ice, water molecules are held in a rigid lattice by stable hydrogen bonds. As
energy (heat) is added, these bonds break, allowing the molecules to slip past each other in
liquid form.
