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NEET UG
NEET Zoology

NEET UG MCQ questions — Physics, Chemistry, Botany & Zoology for medical entrance.

540 Q 4 Subjects 12th (PCB)
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Difficulty: All Easy Medium Hard 1–10 of 540
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Q.1 Hard NEET Zoology Biotechnology & Applications
What is the mechanism by which TALEN (Transcription Activator-Like Effector Nuclease) technology achieves site-specific gene editing?
A Using zinc fingers to recognize DNA sequences directly
B Proteins derived from plant pathogens that recognize specific DNA sequences and direct FokI nuclease to cut
C Using guide RNA complementarity only
D Random cutting followed by selection
Correct Answer:  B. Proteins derived from plant pathogens that recognize specific DNA sequences and direct FokI nuclease to cut
EXPLANATION

TALENs are proteins from Xanthomonas bacteria that recognize specific DNA sequences with modular repeat domains and direct FokI endonuclease for precise DNA cleavage.

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Q.2 Easy NEET Zoology Biotechnology & Applications
In the development of Golden Rice, which essential nutrient was biofortified into the rice grain through genetic engineering?
A Iron and calcium
B Beta-carotene (precursor to Vitamin A) and iron
C Vitamin B12 and zinc
D Protein and carbohydrates
Correct Answer:  B. Beta-carotene (precursor to Vitamin A) and iron
EXPLANATION

Golden Rice was developed to address micronutrient deficiency by introducing genes for beta-carotene synthesis and iron accumulation, addressing vitamin A and iron deficiency.

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Q.3 Medium NEET Zoology Biotechnology & Applications
What is the primary application of AFLP (Amplified Fragment Length Polymorphism) in forensic biotechnology?
A To amplify only coding regions of DNA
B To generate DNA fingerprints for individual identification in criminal investigations
C To sequence entire genomes
D To diagnose genetic diseases only
Correct Answer:  B. To generate DNA fingerprints for individual identification in criminal investigations
EXPLANATION

AFLP generates unique DNA fingerprints by analyzing polymorphic bands through selective amplification and is widely used in forensic identification and paternity testing.

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Q.4 Hard NEET Zoology Biotechnology & Applications
In the context of organ transplantation, what is the potential application of xenotransplantation biotechnology?
A To reduce the need for immunosuppressive drugs by genetically modifying animal organs
B To eliminate the need for organ donation entirely
C To replace only viral infections
D To cure all genetic disorders
Correct Answer:  A. To reduce the need for immunosuppressive drugs by genetically modifying animal organs
EXPLANATION

Xenotransplantation involves genetically modifying animal organs (usually pig organs) to reduce immune rejection, potentially addressing the chronic shortage of human donor organs.

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Q.5 Easy NEET Zoology Biotechnology & Applications
Which of the following represents the correct order of steps in a standard PCR cycle?
A Denaturation → Annealing → Extension
B Extension → Denaturation → Annealing
C Annealing → Extension → Denaturation
D Extension → Annealing → Denaturation
Correct Answer:  A. Denaturation → Annealing → Extension
EXPLANATION

The standard PCR cycle follows the order: denaturation (95°C to separate DNA strands), annealing (50-65°C for primer binding), and extension (72°C for synthesis by Taq polymerase).

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Q.6 Medium NEET Zoology Biotechnology & Applications
In vaccine development using biotechnology, what is the advantage of mRNA vaccines (like those for COVID-19) over traditional inactivated vaccines?
A They produce stronger side effects
B Faster development, production at scale, and strong immune response without infectious agent
C They can only be administered orally
D They require lifelong booster shots
Correct Answer:  B. Faster development, production at scale, and strong immune response without infectious agent
EXPLANATION

mRNA vaccines can be designed and produced rapidly, manufactured at scale, and trigger robust immune responses without requiring actual pathogenic agents.

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Q.7 Medium NEET Zoology Biotechnology & Applications
What is the significance of the Human Genome Project in biotechnology and personalized medicine?
A It mapped all human genes, enabling identification of disease-causing mutations and development of targeted therapies
B It only sequenced mitochondrial DNA
C It proved that all humans have identical genomes
D It was primarily used for agricultural improvement
Correct Answer:  A. It mapped all human genes, enabling identification of disease-causing mutations and development of targeted therapies
EXPLANATION

The Human Genome Project provided the complete human genetic blueprint, revolutionizing our understanding of genetic diseases and enabling personalized medicine approaches.

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Q.8 Hard NEET Zoology Biotechnology & Applications
In gene editing using base editors, what advantage do they offer over traditional CRISPR-Cas9?
A They can edit genes without creating double-strand breaks
B They only work in prokaryotes
C They require less complex equipment
D They are less specific than Cas9
Correct Answer:  A. They can edit genes without creating double-strand breaks
EXPLANATION

Base editors (BEs) convert one DNA base to another without creating double-strand breaks, reducing off-target effects and cellular damage compared to standard CRISPR-Cas9.

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Q.9 Medium NEET Zoology Biotechnology & Applications
Which modern sequencing technology allows for real-time monitoring of DNA synthesis, reducing sequencing time and cost?
A Sanger sequencing
B Next-Generation Sequencing (NGS)
C Nanopore sequencing
D Restriction Fragment Length Polymorphism (RFLP)
Correct Answer:  C. Nanopore sequencing
EXPLANATION

Nanopore sequencing allows real-time DNA reading as strands pass through nanopores, enabling rapid and cost-effective long-read sequencing without amplification.

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Q.10 Medium NEET Zoology Biotechnology & Applications
What is the primary concern with the application of synthetic biology in creating new organisms?
A It is too expensive to implement
B Biosafety and biosecurity risks, including potential creation of harmful organisms
C It requires too much laboratory space
D The public universally supports all synthetic organisms
Correct Answer:  B. Biosafety and biosecurity risks, including potential creation of harmful organisms
EXPLANATION

Synthetic biology raises significant biosafety and biosecurity concerns regarding uncontrolled release of synthetic organisms, potential ecological disruption, and dual-use implications.

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