GEORGIA BIOLOGY EOC-STYLE QUESTIONS
COMPLETE WITH 100% VERIFIED
ANSWERS AND DETAILED RATIONALE
1. A plant seedling is grown in a flask containing a nutrient solution that lacks
magnesium. Which of the following would most directly occur?
A. The plant could not synthesize chlorophyll.
B. The plant’s ATP production would stop entirely.
C. The plant’s stomata would remain permanently closed.
D. The plant would be unable to make nucleic acids.
Correct answer: A
Rationale: Magnesium is the central atom in the chlorophyll molecule. Without
magnesium, chlorophyll synthesis is blocked, leading to chlorosis (yellowing). ATP
production uses magnesium as a cofactor, but it does not stop entirely; the most
direct effect is on chlorophyll.
2. Which cellular process is correctly matched with its location in a eukaryotic
cell?
A. Glycolysis – Mitochondrial matrix
B. Krebs cycle – Cytoplasm
C. Electron transport chain – Inner mitochondrial membrane
D. Fermentation – Nucleus
Correct answer: C
Rationale: The ETC is embedded in the inner mitochondrial membrane. Glycolysis
,occurs in the cytoplasm; the Krebs cycle is in the mitochondrial matrix;
fermentation happens in the cytoplasm.
3. A population of deer has a gene with two alleles: A1 (long legs) and A2 (short
legs). In a dense forest with thick undergrowth, short-legged deer survive better.
Over 20 generations, the frequency of A2 increases from 0.2 to 0.7. This is an
example of:
A. Genetic drift
B. Gene flow
C. Natural selection
D. Mutation pressure
Correct answer: C
Rationale: The change in allele frequency is due to differential survival and
reproduction based on leg length in a specific environment, which is natural
selection. Genetic drift is random; gene flow is migration; mutation pressure is
changes from new mutations.
4. Which statement best describes the role of ATP in cell metabolism?
A. It is a long-term energy storage molecule like starch.
B. It couples energy release from exergonic reactions to endergonic reactions.
C. It is a structural component of cell membranes.
D. It directly transcribes DNA into mRNA.
Correct answer: B
Rationale: ATP transfers energy by hydrolysis, coupling exergonic
(energy-releasing) processes (e.g., glucose breakdown) to endergonic
(energy-requiring) processes (e.g., protein synthesis). It is short-term energy
storage, not long-term.
,5. In a food web, which organisms return nutrients to the soil by breaking down
dead matter?
A. Primary producers
B. Primary consumers
C. Decomposers
D. Secondary consumers
Correct answer: C
Rationale: Decomposers (bacteria, fungi) break down dead organisms and waste,
recycling nutrients. Producers make food; consumers eat other organisms.
6. A scientist crosses two heterozygous pea plants (Tt × Tt) for tall stem (T = tall
dominant, t = short recessive). What percentage of offspring are expected to be
short?
A. 0%
B. 25%
C. 50%
D. 75%
Correct answer: B
Rationale: Heterozygous cross (Tt × Tt) gives genotypic ratio 1 TT : 2 Tt : 1 tt. The tt
genotype (short) occurs in 1/4 or 25% of offspring.
7. A mutation in a skin cell that occurs after birth:
A. Is heritable to offspring.
B. Only affects the individual if it leads to cancer.
C. Can be passed to daughter cells via mitosis.
D. Changes the DNA sequence in gametes.
Correct answer: C
Rationale: Somatic mutations occur in body cells and are not passed to offspring,
but they are passed to daughter cells during mitosis. Only germline mutations are
heritable.
, 8. Which of the following correctly sequences the levels of ecological organization
from smallest to largest?
A. Ecosystem → Community → Population → Organism
B. Organism → Population → Community → Ecosystem
C. Community → Ecosystem → Organism → Population
D. Population → Organism → Community → Ecosystem
Correct answer: B
Rationale: An individual organism is smallest, followed by a population (same
species in an area), then community (all populations), then ecosystem
(community + abiotic factors).
9. The process by which mRNA is synthesized from a DNA template is called:
A. Translation
B. Replication
C. Transcription
D. Transformation
Correct answer: C
Rationale: Transcription = DNA → RNA. Translation = RNA → protein. Replication =
DNA → DNA. Transformation = uptake of foreign DNA by bacteria.
10. In the carbon cycle, which process moves carbon from the atmosphere into
living organisms?
A. Cellular respiration
B. Combustion of fossil fuels
C. Photosynthesis
D. Decomposition
Correct answer: C
Rationale: Photosynthesis fixes atmospheric CO₂ into organic molecules (glucose).
COMPLETE WITH 100% VERIFIED
ANSWERS AND DETAILED RATIONALE
1. A plant seedling is grown in a flask containing a nutrient solution that lacks
magnesium. Which of the following would most directly occur?
A. The plant could not synthesize chlorophyll.
B. The plant’s ATP production would stop entirely.
C. The plant’s stomata would remain permanently closed.
D. The plant would be unable to make nucleic acids.
Correct answer: A
Rationale: Magnesium is the central atom in the chlorophyll molecule. Without
magnesium, chlorophyll synthesis is blocked, leading to chlorosis (yellowing). ATP
production uses magnesium as a cofactor, but it does not stop entirely; the most
direct effect is on chlorophyll.
2. Which cellular process is correctly matched with its location in a eukaryotic
cell?
A. Glycolysis – Mitochondrial matrix
B. Krebs cycle – Cytoplasm
C. Electron transport chain – Inner mitochondrial membrane
D. Fermentation – Nucleus
Correct answer: C
Rationale: The ETC is embedded in the inner mitochondrial membrane. Glycolysis
,occurs in the cytoplasm; the Krebs cycle is in the mitochondrial matrix;
fermentation happens in the cytoplasm.
3. A population of deer has a gene with two alleles: A1 (long legs) and A2 (short
legs). In a dense forest with thick undergrowth, short-legged deer survive better.
Over 20 generations, the frequency of A2 increases from 0.2 to 0.7. This is an
example of:
A. Genetic drift
B. Gene flow
C. Natural selection
D. Mutation pressure
Correct answer: C
Rationale: The change in allele frequency is due to differential survival and
reproduction based on leg length in a specific environment, which is natural
selection. Genetic drift is random; gene flow is migration; mutation pressure is
changes from new mutations.
4. Which statement best describes the role of ATP in cell metabolism?
A. It is a long-term energy storage molecule like starch.
B. It couples energy release from exergonic reactions to endergonic reactions.
C. It is a structural component of cell membranes.
D. It directly transcribes DNA into mRNA.
Correct answer: B
Rationale: ATP transfers energy by hydrolysis, coupling exergonic
(energy-releasing) processes (e.g., glucose breakdown) to endergonic
(energy-requiring) processes (e.g., protein synthesis). It is short-term energy
storage, not long-term.
,5. In a food web, which organisms return nutrients to the soil by breaking down
dead matter?
A. Primary producers
B. Primary consumers
C. Decomposers
D. Secondary consumers
Correct answer: C
Rationale: Decomposers (bacteria, fungi) break down dead organisms and waste,
recycling nutrients. Producers make food; consumers eat other organisms.
6. A scientist crosses two heterozygous pea plants (Tt × Tt) for tall stem (T = tall
dominant, t = short recessive). What percentage of offspring are expected to be
short?
A. 0%
B. 25%
C. 50%
D. 75%
Correct answer: B
Rationale: Heterozygous cross (Tt × Tt) gives genotypic ratio 1 TT : 2 Tt : 1 tt. The tt
genotype (short) occurs in 1/4 or 25% of offspring.
7. A mutation in a skin cell that occurs after birth:
A. Is heritable to offspring.
B. Only affects the individual if it leads to cancer.
C. Can be passed to daughter cells via mitosis.
D. Changes the DNA sequence in gametes.
Correct answer: C
Rationale: Somatic mutations occur in body cells and are not passed to offspring,
but they are passed to daughter cells during mitosis. Only germline mutations are
heritable.
, 8. Which of the following correctly sequences the levels of ecological organization
from smallest to largest?
A. Ecosystem → Community → Population → Organism
B. Organism → Population → Community → Ecosystem
C. Community → Ecosystem → Organism → Population
D. Population → Organism → Community → Ecosystem
Correct answer: B
Rationale: An individual organism is smallest, followed by a population (same
species in an area), then community (all populations), then ecosystem
(community + abiotic factors).
9. The process by which mRNA is synthesized from a DNA template is called:
A. Translation
B. Replication
C. Transcription
D. Transformation
Correct answer: C
Rationale: Transcription = DNA → RNA. Translation = RNA → protein. Replication =
DNA → DNA. Transformation = uptake of foreign DNA by bacteria.
10. In the carbon cycle, which process moves carbon from the atmosphere into
living organisms?
A. Cellular respiration
B. Combustion of fossil fuels
C. Photosynthesis
D. Decomposition
Correct answer: C
Rationale: Photosynthesis fixes atmospheric CO₂ into organic molecules (glucose).
