HESI A2 BIOLOGY CONCEPTS 2025
1. If a cell undergoes a mutation that affects the structure of its chromosomes,
what potential impact could this have on the cell's function?
The cell would likely produce more energy.
The cell may experience difficulties in cell division and genetic
information transmission.
The cell would become more efficient at photosynthesis.
The cell would increase its metabolic rate.
2. Which best describes a result of sexual reproduction?
The offspring obtain genes from only one parent
The only source of variation is mutation
Two sex cells combine to form a fertilized cell
One cell divides to produce two identical cells
Clones of the original cells are produced
3. What is the primary function of the nucleus in a cell?
Producing energy through cellular respiration
Synthesizing proteins
Housing DNA and chromosomes
Facilitating photosynthesis
4. What is the primary function of glycolysis in cellular respiration?
Conversion of glucose to pyruvate
Production of ATP through oxidative phosphorylation
Synthesis of fatty acids
, Formation of amino acids
5. If a cell's Golgi apparatus were to malfunction, what impact would this have
on the cell's ability to function properly?
The cell would produce more energy than needed.
The cell would be unable to properly process and distribute
proteins and lipids, leading to cellular dysfunction.
The cell would replicate its DNA more efficiently.
The cell would increase its rate of photosynthesis.
6. Explain how transfer RNA (tRNA) interacts with messenger RNA (mRNA)
during protein synthesis.
tRNA binds to DNA to initiate transcription
tRNA carries amino acids to the ribosome and pairs with codons
on mRNA
tRNA synthesizes mRNA from amino acids
tRNA degrades mRNA after protein synthesis
7. If a cell undergoes mitosis but fails to complete cytokinesis, what would be
the likely outcome for the resulting cells?
Two identical cells with separate nuclei
One large cell with two nuclei
Four cells with half the genetic material
Two cells with unequal distribution of organelles
8. Explain the difference between heterozygous and homozygous traits in
terms of allele composition.
Heterozygous traits have two identical alleles, while homozygous
traits have two different alleles.
, Heterozygous traits have two different alleles, while homozygous
traits have two identical alleles.
Both heterozygous and homozygous traits have identical alleles.
Heterozygous traits are always dominant, while homozygous traits
are always recessive.
9. If a mutation occurs in the gene coding for a specific enzyme, what
potential impact could this have on cellular metabolism?
It could enhance the enzyme's activity, speeding up metabolic
processes.
It could lead to a complete loss of enzyme function, disrupting
metabolic pathways.
It would have no effect on metabolism since enzymes are not
crucial.
It could change the enzyme's substrate specificity, allowing it to
catalyze different reactions.
10. What does Deoxyribonucleic Acid (DNA) contain that is essential for
replication?
Proteins necessary for cell division
The genetic code specific to an organism
Ribosomal RNA for protein synthesis
Enzymes for metabolic processes
11. If a scientist were to inhibit the synthesis of steroids in a cell, what potential
effects might this have on hormone levels and cellular functions?
Increased energy production and enhanced cellular respiration.
Decreased hormone production and potential disruption of cell
membrane integrity.
Enhanced photosynthesis and improved metabolic rates.
, No significant effect on cellular functions.
12. Explain the role of mitochondria in eukaryotic cells and how they
contribute to cellular metabolism.
Mitochondria produce glucose through photosynthesis.
Mitochondria are involved in the breakdown of fatty acids.
Mitochondria generate ATP through the process of cellular
respiration.
Mitochondria synthesize proteins for cellular functions.
13. Explain the significance of the five stages of meiosis in the context of
genetic diversity.
They ensure that cells divide equally.
They allow for the exchange of genetic material between
homologous chromosomes.
They are responsible for the replication of DNA.
They prepare the cell for photosynthesis.
14. The first step of Krebs cycle is the creation of Citrate from
Pyruvate + Oxaloacetate
NADH + Pyruvate
Pyruvate + Acetyl-CoA
Acetyl-CoA + Oxaloacetate
15. What is the primary function of the rough endoplasmic reticulum (Rough
ER)?
Lipid synthesis
Protein synthesis and membrane production
DNA replication
1. If a cell undergoes a mutation that affects the structure of its chromosomes,
what potential impact could this have on the cell's function?
The cell would likely produce more energy.
The cell may experience difficulties in cell division and genetic
information transmission.
The cell would become more efficient at photosynthesis.
The cell would increase its metabolic rate.
2. Which best describes a result of sexual reproduction?
The offspring obtain genes from only one parent
The only source of variation is mutation
Two sex cells combine to form a fertilized cell
One cell divides to produce two identical cells
Clones of the original cells are produced
3. What is the primary function of the nucleus in a cell?
Producing energy through cellular respiration
Synthesizing proteins
Housing DNA and chromosomes
Facilitating photosynthesis
4. What is the primary function of glycolysis in cellular respiration?
Conversion of glucose to pyruvate
Production of ATP through oxidative phosphorylation
Synthesis of fatty acids
, Formation of amino acids
5. If a cell's Golgi apparatus were to malfunction, what impact would this have
on the cell's ability to function properly?
The cell would produce more energy than needed.
The cell would be unable to properly process and distribute
proteins and lipids, leading to cellular dysfunction.
The cell would replicate its DNA more efficiently.
The cell would increase its rate of photosynthesis.
6. Explain how transfer RNA (tRNA) interacts with messenger RNA (mRNA)
during protein synthesis.
tRNA binds to DNA to initiate transcription
tRNA carries amino acids to the ribosome and pairs with codons
on mRNA
tRNA synthesizes mRNA from amino acids
tRNA degrades mRNA after protein synthesis
7. If a cell undergoes mitosis but fails to complete cytokinesis, what would be
the likely outcome for the resulting cells?
Two identical cells with separate nuclei
One large cell with two nuclei
Four cells with half the genetic material
Two cells with unequal distribution of organelles
8. Explain the difference between heterozygous and homozygous traits in
terms of allele composition.
Heterozygous traits have two identical alleles, while homozygous
traits have two different alleles.
, Heterozygous traits have two different alleles, while homozygous
traits have two identical alleles.
Both heterozygous and homozygous traits have identical alleles.
Heterozygous traits are always dominant, while homozygous traits
are always recessive.
9. If a mutation occurs in the gene coding for a specific enzyme, what
potential impact could this have on cellular metabolism?
It could enhance the enzyme's activity, speeding up metabolic
processes.
It could lead to a complete loss of enzyme function, disrupting
metabolic pathways.
It would have no effect on metabolism since enzymes are not
crucial.
It could change the enzyme's substrate specificity, allowing it to
catalyze different reactions.
10. What does Deoxyribonucleic Acid (DNA) contain that is essential for
replication?
Proteins necessary for cell division
The genetic code specific to an organism
Ribosomal RNA for protein synthesis
Enzymes for metabolic processes
11. If a scientist were to inhibit the synthesis of steroids in a cell, what potential
effects might this have on hormone levels and cellular functions?
Increased energy production and enhanced cellular respiration.
Decreased hormone production and potential disruption of cell
membrane integrity.
Enhanced photosynthesis and improved metabolic rates.
, No significant effect on cellular functions.
12. Explain the role of mitochondria in eukaryotic cells and how they
contribute to cellular metabolism.
Mitochondria produce glucose through photosynthesis.
Mitochondria are involved in the breakdown of fatty acids.
Mitochondria generate ATP through the process of cellular
respiration.
Mitochondria synthesize proteins for cellular functions.
13. Explain the significance of the five stages of meiosis in the context of
genetic diversity.
They ensure that cells divide equally.
They allow for the exchange of genetic material between
homologous chromosomes.
They are responsible for the replication of DNA.
They prepare the cell for photosynthesis.
14. The first step of Krebs cycle is the creation of Citrate from
Pyruvate + Oxaloacetate
NADH + Pyruvate
Pyruvate + Acetyl-CoA
Acetyl-CoA + Oxaloacetate
15. What is the primary function of the rough endoplasmic reticulum (Rough
ER)?
Lipid synthesis
Protein synthesis and membrane production
DNA replication
