,GEORGIA BIOLOGY EOC ULTIMATE
STUDY GUIDE (2026 EDITION) | 400
HIGH-YIELD PRACTICE QUESTIONS
& RATIONALES (PDF)
Master the Georgia Milestones Assessment System
with this comprehensive, high-density study guide
featuring 400 meticulously crafted practice questions
mapped directly to the latest GA DOE standards
(SB1 - SB6). Every multiple-choice question includes
in-depth biological rationales that reinforce critical
concepts across Cells, Genetics, Organismal
Relations/Ecology, and Evolution [SB1]. Perfect for
quick scanning or automated classroom testing, this
Stuvia-ready document serves as the ultimate
resource for students aiming for a "Distinguished
Learner" score and educators seeking a turn-key
EOC review curriculum.
1.A high school student isolates a group of single-celled organisms from a pond sample.
Under a microscope, she notes the cells lack a nuclear membrane but contain free-
floating circular DNA and ribosomes. How should these cells be classified?
A) Eukaryotic animal cells
B) Eukaryotic protist cells
C) Prokaryotic bacterial cells
D) Eukaryotic plant cells
Answer: C) Prokaryotic bacterial cells
, Rationale: Under Georgia standard SB1, prokaryotes are explicitly characterized by the
absence of a membrane-bound nucleus and membrane-bound organelles. Their genetic
material is organized in a circular chromosome located in the nucleoid region, and they
contain ribosomes for protein synthesis.
2. A biologist measures a localized ecosystem area of 200 square meters and counts
exactly 40 oak trees within that zone. What is the population density of the oak trees?
A) 0.5 oak trees per square meter
B) 0.2 oak trees per square meter
C) 5 oak trees per square meter
D) 2 oak trees per square meter
Answer: B) 0.2 oak trees per square meter
Rationale: Population density is determined using the formula: Density = Total Number
of Individuals / Total Area. Substituting the given metrics yields: 40 oak trees / 200
square meters = 0.2 oak trees per square meter.
3. During intense weight training exercises, a person's muscle cells utilize all available
oxygen molecules. Which metabolic waste byproduct will begin accumulating in the
muscle tissue?
A) Ethanol
B) Lactic acid
C) Carbon dioxide only
D) Glucose
Answer: B) Lactic acid
Rationale: Standard SB1 addresses cellular energetics. When oxygen availability is
depleted, human muscle cells switch from aerobic respiration to lactic acid fermentation
to regenerate NAD+ for glycolysis. This anaerobic pathway produces lactic acid as a
waste byproduct, causing localized muscle fatigue.
4. An urban planning committee wants to reduce the carbon footprint and mitigate the
greenhouse effect within a city. Which action provides the most sustainable long-term
environmental benefit?
A) Clearing local wetlands to construct paved parking complexes.
B) Replacing coal-fired electrical plants with solar panel fields and wind turbines.
C) Expanding the use of diesel-powered personal transit vehicles.
D) Increasing the burning of municipal solid waste in open-air facilities.
: B) Replacing coal-fired electrical plants with solar panel fields and wind turbines
Answer
. Rationale: Standard SB4 evaluates human impacts on ecosystems. Transitioning from fossil-
fuel combustion to renewable energy infrastructure (solar and wind) directly eliminates the
emission of carbon dioxide, a major anthropogenic greenhouse gas that drives global climate
shifts.
5. A segment of a DNA template strand contains the nucleotide sequence 3'-TAC GGC
TTA-5'. What is the corresponding sequence of codons found on the transcribed mRNA
molecule?
A) 5'-ATG CCG AAT-3'
, B) 5'-AUG CCG AAU-3'
C) 5'-UAC GGC UUA-3'
D) 5'-AUG GGC UUA-3'
Answer: B) 5'-AUG CCG AAU-3'
Rationale: Standard SB2 covers genetics and protein synthesis. During transcription,
RNA polymerase matches RNA nucleotides to the DNA template strand using
complementary base-pairing rules (A pairs with U, T pairs with A, C pairs with G, and G
pairs with C). Therefore, TAC transcribes to AUG, GGC to CCG, and TTA to AAU.
6. What is the primary evolutionary and reproductive benefit of the genetic crossover
events that take place during prophase I of meiosis?
A) It duplicates the total number of chromosomes within a somatic cell.
B) It introduces mutations that arrest cell division cycles.
C) It increases genetic diversity by reshuffling maternal and paternal alleles.
D) It ensures that daughter cells are exact clones of the parent organism.
Answer: C) It increases genetic diversity by reshuffling maternal and paternal
alleles.
Rationale: Meiosis standard SB2 focuses on genetic variation. Crossing over involves
the physical swapping of genetic segments between non-sister chromatids of
homologous chromosomes. This process breaks up linkage groups and creates unique
combinations of alleles in resulting gametes.
7. A population of dark-colored and light-colored peppered moths lives in a forest. Over
several years, industrial pollution covers the tree bark in dark soot. How will natural
selection most likely alter the moth population?
A) The frequency of the light-colored phenotype will increase.
B) The frequency of the dark-colored phenotype will increase.
C) Both phenotypes will decrease at identical structural rates.
D) The moths will stop reproducing sexually to avoid predation.
Answer: B) The frequency of the dark-colored phenotype will increase.
Rationale: Standard SB6 covers evolution. Environmental changes alter selective
pressures. Dark-colored moths possess a survival advantage on soot-covered trees due
to enhanced camouflage, leading to higher survival and reproductive rates (differential
fitness), increasing the dark allele frequency over time.
8. Which organic macromolecule is primarily composed of a glycerol backbone bound to
three fatty acid chains and functions as long-term energy storage?
A) Carbohydrate
B) Lipid
C) Protein
D) Nucleic acid
Answer: B) Lipid
Rationale: Standard SB1 covers biochemistry. Triglycerides are standard lipids built
from a single glycerol molecule attached to three fatty acid chains. Because of their
STUDY GUIDE (2026 EDITION) | 400
HIGH-YIELD PRACTICE QUESTIONS
& RATIONALES (PDF)
Master the Georgia Milestones Assessment System
with this comprehensive, high-density study guide
featuring 400 meticulously crafted practice questions
mapped directly to the latest GA DOE standards
(SB1 - SB6). Every multiple-choice question includes
in-depth biological rationales that reinforce critical
concepts across Cells, Genetics, Organismal
Relations/Ecology, and Evolution [SB1]. Perfect for
quick scanning or automated classroom testing, this
Stuvia-ready document serves as the ultimate
resource for students aiming for a "Distinguished
Learner" score and educators seeking a turn-key
EOC review curriculum.
1.A high school student isolates a group of single-celled organisms from a pond sample.
Under a microscope, she notes the cells lack a nuclear membrane but contain free-
floating circular DNA and ribosomes. How should these cells be classified?
A) Eukaryotic animal cells
B) Eukaryotic protist cells
C) Prokaryotic bacterial cells
D) Eukaryotic plant cells
Answer: C) Prokaryotic bacterial cells
, Rationale: Under Georgia standard SB1, prokaryotes are explicitly characterized by the
absence of a membrane-bound nucleus and membrane-bound organelles. Their genetic
material is organized in a circular chromosome located in the nucleoid region, and they
contain ribosomes for protein synthesis.
2. A biologist measures a localized ecosystem area of 200 square meters and counts
exactly 40 oak trees within that zone. What is the population density of the oak trees?
A) 0.5 oak trees per square meter
B) 0.2 oak trees per square meter
C) 5 oak trees per square meter
D) 2 oak trees per square meter
Answer: B) 0.2 oak trees per square meter
Rationale: Population density is determined using the formula: Density = Total Number
of Individuals / Total Area. Substituting the given metrics yields: 40 oak trees / 200
square meters = 0.2 oak trees per square meter.
3. During intense weight training exercises, a person's muscle cells utilize all available
oxygen molecules. Which metabolic waste byproduct will begin accumulating in the
muscle tissue?
A) Ethanol
B) Lactic acid
C) Carbon dioxide only
D) Glucose
Answer: B) Lactic acid
Rationale: Standard SB1 addresses cellular energetics. When oxygen availability is
depleted, human muscle cells switch from aerobic respiration to lactic acid fermentation
to regenerate NAD+ for glycolysis. This anaerobic pathway produces lactic acid as a
waste byproduct, causing localized muscle fatigue.
4. An urban planning committee wants to reduce the carbon footprint and mitigate the
greenhouse effect within a city. Which action provides the most sustainable long-term
environmental benefit?
A) Clearing local wetlands to construct paved parking complexes.
B) Replacing coal-fired electrical plants with solar panel fields and wind turbines.
C) Expanding the use of diesel-powered personal transit vehicles.
D) Increasing the burning of municipal solid waste in open-air facilities.
: B) Replacing coal-fired electrical plants with solar panel fields and wind turbines
Answer
. Rationale: Standard SB4 evaluates human impacts on ecosystems. Transitioning from fossil-
fuel combustion to renewable energy infrastructure (solar and wind) directly eliminates the
emission of carbon dioxide, a major anthropogenic greenhouse gas that drives global climate
shifts.
5. A segment of a DNA template strand contains the nucleotide sequence 3'-TAC GGC
TTA-5'. What is the corresponding sequence of codons found on the transcribed mRNA
molecule?
A) 5'-ATG CCG AAT-3'
, B) 5'-AUG CCG AAU-3'
C) 5'-UAC GGC UUA-3'
D) 5'-AUG GGC UUA-3'
Answer: B) 5'-AUG CCG AAU-3'
Rationale: Standard SB2 covers genetics and protein synthesis. During transcription,
RNA polymerase matches RNA nucleotides to the DNA template strand using
complementary base-pairing rules (A pairs with U, T pairs with A, C pairs with G, and G
pairs with C). Therefore, TAC transcribes to AUG, GGC to CCG, and TTA to AAU.
6. What is the primary evolutionary and reproductive benefit of the genetic crossover
events that take place during prophase I of meiosis?
A) It duplicates the total number of chromosomes within a somatic cell.
B) It introduces mutations that arrest cell division cycles.
C) It increases genetic diversity by reshuffling maternal and paternal alleles.
D) It ensures that daughter cells are exact clones of the parent organism.
Answer: C) It increases genetic diversity by reshuffling maternal and paternal
alleles.
Rationale: Meiosis standard SB2 focuses on genetic variation. Crossing over involves
the physical swapping of genetic segments between non-sister chromatids of
homologous chromosomes. This process breaks up linkage groups and creates unique
combinations of alleles in resulting gametes.
7. A population of dark-colored and light-colored peppered moths lives in a forest. Over
several years, industrial pollution covers the tree bark in dark soot. How will natural
selection most likely alter the moth population?
A) The frequency of the light-colored phenotype will increase.
B) The frequency of the dark-colored phenotype will increase.
C) Both phenotypes will decrease at identical structural rates.
D) The moths will stop reproducing sexually to avoid predation.
Answer: B) The frequency of the dark-colored phenotype will increase.
Rationale: Standard SB6 covers evolution. Environmental changes alter selective
pressures. Dark-colored moths possess a survival advantage on soot-covered trees due
to enhanced camouflage, leading to higher survival and reproductive rates (differential
fitness), increasing the dark allele frequency over time.
8. Which organic macromolecule is primarily composed of a glycerol backbone bound to
three fatty acid chains and functions as long-term energy storage?
A) Carbohydrate
B) Lipid
C) Protein
D) Nucleic acid
Answer: B) Lipid
Rationale: Standard SB1 covers biochemistry. Triglycerides are standard lipids built
from a single glycerol molecule attached to three fatty acid chains. Because of their
