Skip to content

#molecular biology

918 public questions tagged with this topic.

Which of the following is incorrect about mRNA processing in eukaryotes?

**mRNA is not translated in the nucleus**; it must first be processed and transported to the cytoplasm. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.

Which of the following is a function of rRNA?

rRNA forms the structural and catalytic part of ribosomes, playing a key role in translation. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.

Which of the following statements about cloning vectors is incorrect?

Cloning vectors contain an origin of replication, allowing them to replicate independently inside a host ll. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

Which of the following statements about cloning vectors is correct?

Cloning vectors must contain an origin of replication to allow independent replication inside a host ll. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

What is the primary role of the XIST gene in female mammals?

The XIST gene is responsible for X chromosome inactivation in female mammals. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

Which type of enzyme seals the DNA fragments after cutting?

DNA ligase joins the cut DNA fragments by forming phosphodiester bonds between them. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

Which of the following enzymes is used in recombinant DNA technology to synthesize complementary DNA (cDNA) from mRNA?

Reverse transcriptase synthesizes complementary DNA (cDNA) from an mRNA template, a key step in cloning eukaryotic genes. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

Which component is essential for initiating the Polymerase Chain Reaction (PCR)?

Primers are short sequences of nucleotides essential for initiating DNA synthesis in PCR. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Principles of Inheritance, Molecular Basis of Inheritance and Biotechnology, Topic: Genetics, DNA techniques and applications.

Which of the following statements about DNA ligase is correct?

DNA ligase seals nicks in the sugar-phosphate backbone by forming phosphodiester bonds between DNA fragments. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

Which enzyme is responsible for forming phosphodiester bonds between DNA fragments?

Ligase is responsible for forming phosphodiester bonds between DNA fragments during recombinant DNA formation. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Principles of Inheritance, Molecular Basis of Inheritance and Biotechnology, Topic: Genetics, DNA techniques and applications.

Which of the following statements about DNA polymerase is incorrect?

DNA polymerase synthesizes new DNA in the 5' to 3' direction, not 3' to 5'. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Principles of Inheritance, Molecular Basis of Inheritance and Biotechnology, Topic: Genetics, DNA techniques and applications.

Which of the following is used to extract and purify DNA fragments from an agarose gel?

Elution is the process of extracting DNA fragments from an agarose gel for further use in recombinant DNA experiments. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.