Among eukaryotes, replication of DNA takes place in

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

• G₂ phase
• M phase
• S phase
• G₁ phase
Correct Option: C  [ S phase ]

Remark:

Which of the following stages of meiosis involves division of centromere?

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

• Telophase
• Metaphase I
• Metaphase II
• Anaphase II
Correct Option: D  [ Anaphase II ]

Remark:

The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

• Diakinesis
• Pachytene
• Zygotene
• Diplotenes
Correct Option: B  [ Pachytene ]

Remark:

Match List-I with List-II

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

• A-II, B-IV, C-I, D-III
• A-III, B-II, C-IV, D-I
• A-IV, B-II, C-I, D-III
• A-IV, B-I, C-II, D-III
Correct Option: D  [ A-IV, B-I, C-II, D-III ]

Remark:

Given below are two statements:
Statement I: During G_o phase of cell cycle the cell is metabolically inactive.
Statement II: The centrosome undergoes duplication during S phase of interphase.
In the light of the above statements, choose the most appropriate answer from the option below:

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

• Statement I is incorrect but Statement II is correct.
• Both Statement I and Statement II are correct
• Both Statement I and Statement II are incorrect.
• Statement I is correct but Statement II is incorrect.
Correct Option: A  [ Statement I is incorrect but Statement II is correct. ]

Remark:

Select the correct statements
A.Tetrad formation is seen during leptotene.
B.During Anaphase, the centromere split and chromatids separate.
C.Terminalization takes place during Pachytene.
D.Nucleolus, Golgi complex and ER are reformed during Telophase.
E.Crossing over takes place between sister chromatids of homologous.
Choose the correct answer from the option given below:

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

• B and E only
• A and C only
• B and D only
• A, C and E only
Correct Option: C  [ B and D only ]

Remark:

Which one of the following never occurs during mitotic cell division?

NEET-2022 [Cell-Cycle-and-Cell-Division] [class-xi ]

• Spindle fibres attach to kinetochores of chromosomes.
• Movement of centrioles towards opposite poles.
• Pairing of homologous chromosomes.
• Coiling and condensation of the chromatids.
Correct Option: C  [ Pairing of homologous chromosomes. ]

Remark:

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes :

NEET-2022 [Cell-Cycle-and-Cell-Division] [class-xi ]

• Synaptonemal complex
• Bivalent
• Sites at which crossing over occurs
• Terminalization
Correct Option: C  [ Sites at which crossing over occurs ]

Remark:

Match List-I with List-II.

NEET-2022 [Cell-Cycle-and-Cell-Division] [class-xi ]

• (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
• (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
• (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
• (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
Correct Option: A  [ (A)-(III), (B)-(I), (C)-(IV), (D)-(II) ]

Remark:

Select the incorrect statement with reference to mitosis:

NEET-2022 [Cell-Cycle-and-Cell-Division] [class-xi ]

• All the chromosomes lie at the equator at metaphase
• Spindle fibres attach to centromere of chromosomes
• Chromosomes decondense at telophase
• Splitting of centromere occurs at anaphase
Correct Option: B  [ Spindle fibres attach to centromere of chromosomes ]

Remark: