Dental Admission Test (DAT) Practice Exam –
Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
Biology (1–15)
1. Which organelle is responsible for producing ATP in eukaryotic cells?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Rationale: The mitochondrion is the site of cellular respiration,
converting glucose into ATP.
2. In Mendelian genetics, the probability of obtaining a homozygous
recessive offspring from two heterozygous parents is:
A) 25%
B) 50%
C) 75%
D) 25%
Rationale: Crossing Aa × Aa gives a genotype ratio of 1 AA : 2 Aa : 1 aa.
Probability of aa is 1/4 or 25%.
3. Which of the following processes occurs during prophase of mitosis?
A) Cytokinesis begins
B) Chromatids separate
C) Chromosomes condense
D) Nuclear membrane reforms
Rationale: During prophase, chromatin condenses into visible
chromosomes and the nuclear membrane begins breaking down.
4. The main function of ribosomes is:
A) Lipid synthesis
B) Protein synthesis
, C) DNA replication
D) ATP production
Rationale: Ribosomes are the sites of translation, where amino acids are
assembled into proteins.
5. Which of the following is a characteristic of prokaryotic cells?
A) Nucleus present
B) Lack of membrane-bound organelles
C) Mitochondria present
D) Linear DNA
Rationale: Prokaryotes, like bacteria, do not have membrane-bound
organelles, and their DNA is circular.
6. The enzyme that unwinds DNA during replication is:
A) DNA polymerase
B) Ligase
C) Helicase
D) Primase
Rationale: Helicase unwinds the double helix, creating replication forks.
7. Which type of RNA carries amino acids to the ribosome during
translation?
A) mRNA
B) tRNA
C) rRNA
D) snRNA
Rationale: Transfer RNA (tRNA) matches amino acids to the codons on
mRNA during protein synthesis.
8. The Calvin cycle occurs in the:
A) Mitochondrial matrix
B) Cytoplasm
C) Stroma of the chloroplast
D) Thylakoid membrane
Rationale: The Calvin cycle (dark reactions) fixes CO₂ into sugars in the
stroma.
9. A population with equal numbers of individuals in all age groups is said
to be:
A) Expanding
, B) Declining
C) Stable
D) Random
Rationale: A stable population has a roughly equal distribution of ages
and consistent growth.
10.Which of the following is NOT a characteristic of enzymes?
A) Speed up chemical reactions
B) Highly specific
C) Permanently altered during reaction
D) Lower activation energy
Rationale: Enzymes are catalysts and are not permanently altered during
reactions.
11.Which structure is common to all viruses?
A) Ribosome
B) Nucleus
C) Capsid
D) Mitochondria
Rationale: All viruses have a protein coat called a capsid, enclosing their
genetic material.
12.In ecology, a keystone species is:
A) The most abundant species
B) A species with the largest biomass
C) A species that has a disproportionate effect on its ecosystem
D) A top predator only
Rationale: Keystone species maintain ecological balance; their removal
dramatically alters the ecosystem.
13.During cellular respiration, the final electron acceptor in the electron
transport chain is:
A) NAD⁺
B) FAD
C) Oxygen
D) CO₂
Rationale: Oxygen accepts electrons at the end of the electron transport
chain, forming water.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
Biology (1–15)
1. Which organelle is responsible for producing ATP in eukaryotic cells?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Rationale: The mitochondrion is the site of cellular respiration,
converting glucose into ATP.
2. In Mendelian genetics, the probability of obtaining a homozygous
recessive offspring from two heterozygous parents is:
A) 25%
B) 50%
C) 75%
D) 25%
Rationale: Crossing Aa × Aa gives a genotype ratio of 1 AA : 2 Aa : 1 aa.
Probability of aa is 1/4 or 25%.
3. Which of the following processes occurs during prophase of mitosis?
A) Cytokinesis begins
B) Chromatids separate
C) Chromosomes condense
D) Nuclear membrane reforms
Rationale: During prophase, chromatin condenses into visible
chromosomes and the nuclear membrane begins breaking down.
4. The main function of ribosomes is:
A) Lipid synthesis
B) Protein synthesis
, C) DNA replication
D) ATP production
Rationale: Ribosomes are the sites of translation, where amino acids are
assembled into proteins.
5. Which of the following is a characteristic of prokaryotic cells?
A) Nucleus present
B) Lack of membrane-bound organelles
C) Mitochondria present
D) Linear DNA
Rationale: Prokaryotes, like bacteria, do not have membrane-bound
organelles, and their DNA is circular.
6. The enzyme that unwinds DNA during replication is:
A) DNA polymerase
B) Ligase
C) Helicase
D) Primase
Rationale: Helicase unwinds the double helix, creating replication forks.
7. Which type of RNA carries amino acids to the ribosome during
translation?
A) mRNA
B) tRNA
C) rRNA
D) snRNA
Rationale: Transfer RNA (tRNA) matches amino acids to the codons on
mRNA during protein synthesis.
8. The Calvin cycle occurs in the:
A) Mitochondrial matrix
B) Cytoplasm
C) Stroma of the chloroplast
D) Thylakoid membrane
Rationale: The Calvin cycle (dark reactions) fixes CO₂ into sugars in the
stroma.
9. A population with equal numbers of individuals in all age groups is said
to be:
A) Expanding
, B) Declining
C) Stable
D) Random
Rationale: A stable population has a roughly equal distribution of ages
and consistent growth.
10.Which of the following is NOT a characteristic of enzymes?
A) Speed up chemical reactions
B) Highly specific
C) Permanently altered during reaction
D) Lower activation energy
Rationale: Enzymes are catalysts and are not permanently altered during
reactions.
11.Which structure is common to all viruses?
A) Ribosome
B) Nucleus
C) Capsid
D) Mitochondria
Rationale: All viruses have a protein coat called a capsid, enclosing their
genetic material.
12.In ecology, a keystone species is:
A) The most abundant species
B) A species with the largest biomass
C) A species that has a disproportionate effect on its ecosystem
D) A top predator only
Rationale: Keystone species maintain ecological balance; their removal
dramatically alters the ecosystem.
13.During cellular respiration, the final electron acceptor in the electron
transport chain is:
A) NAD⁺
B) FAD
C) Oxygen
D) CO₂
Rationale: Oxygen accepts electrons at the end of the electron transport
chain, forming water.
