#cell biology

BOTANY

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

The **poly-A tail is added to the 3' end** of mRNA, not the 5' end. 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 -

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ZOOLOGY

Which part of the neuron contains the nucleus and most of the organelles?

The ll body (or soma) contains the nucleus and most of the neuron's organelles. 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.

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BOTANY

Which compound is formed when oxygen acts as the final electron acceptor in respiration?

Oxygen combines with hydrogen ions and electrons at the end of the Electron Transport Chain to form water. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.

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BOTANY

Which of the followings is incorrect about ntrioles?

Centrioles are generally absent in higher plant lls but play a crucial role in ll division in animal lls. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.

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BOTANY

Which of the following is incorrect about ntrioles?

Centrioles are found in animal lls but are usually absent in higher plant lls. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.

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BOTANY

Which of the following is correct about ntrioles?

Centrioles play a key role in organizing microtubules to form the spindle apparatus during ll division, especially in animal 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: Cell Structure and Function, Cell Cycle and Biomolecules, Topic: Cell organelles and biomolecular structure.

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BOTANY

Which organelle in animal lls helps form spindle fibers during ll division?

The ntrosome, containing ntrioles, is responsible for organizing microtubules and forming spindle fibers during mitosis. 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: Cell Structure and Function, Cell Cycle and Biomolecules, Topic: Cell organelles and biomolecular structure.

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BOTANY

Which organelle is involved in the formation of spindle fibers during ll division in animal lls?

The ntrosome, containing ntrioles, is involved in organizing spindle fibers during ll division in animal 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.

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BOTANY

Which of the following is incorrect about cilia and flagella?

Cilia are usually shorter and more numerous than flagella, which are longer and fewer in number. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.

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ZOOLOGY

Which of the following methods can be used to introduce DNA into animal lls?

Electroporation uses an electric field to create pores in the ll membrane, allowing DNA to enter animal lls. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biotechnology Principles and Processes, Topic: Gene transfer into animal cells, electroporation method.

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ZOOLOGY

Which technique is used to deliver foreign genes into animal lls using fine glass needles?

Microinjection involves delivering foreign genes into animal lls using fine glass needles under a microscope. 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: Biology - Zoology portion covering relevant system and function.

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BOTANY

Which checkpoint ensures that the DNA has been correctly replicated before mitosis begins?

The G2 checkpoint ensures that DNA replication is complete and accurate before the ll enters mitosis. 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.

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