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#enzymes

76 public questions tagged with this topic.

Which enzyme is responsible for proofreading during DNA replication?

DNA polymerase has proofreading ability to correct errors during DNA replication. 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 enzyme is responsible for crossing over during meiosis?

Recombinase facilitates crossing over during the pachytene stage of prophase I in meiosis. 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 enzymes is responsible for synthesizing the lagging strand during DNA replication?

DNA polymerase III synthesizes the lagging strand in short Okazaki fragments during DNA replication. 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 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 statements about enzymes is incorrect?

Enzymes are not consumed in reactions; they remain unchanged and can be reused. 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 of the following statements about enzymes is incorrect?

Enzymes are not consumed in reactions; they remain unchanged and can be reused. 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 of the following statements about topoisomerase is correct?

Topoisomerase relieves supercoiling tension in DNA by cutting and rejoining DNA strands. 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 enzyme is absent in mesophyll lls of Câ‚„ plants?

In Câ‚„ plants, RuBisCO is absent in mesophyll lls and is present only in bundle sheath lls. 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 enzymes is incorrect?

Enzymes work within specific pH and temperature ranges. Extreme conditions can denature them. 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 of the following is a coenzyme?

NAD (Nicotinamide Adenine Dinucleotide) is a coenzyme that plays a key role in redox reactions. 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.