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Cell Cycle and Cell Division · Question 69

AIPMT 2005MCQEasy📈 Topic in 50% papers+4−1
1

Centromere is required for -

  1. Crossing over
  2. Movement of chromosomes towards poles
  3. Transcription
  4. Cytoplasmic cleavage

Answer

(2) Movement of chromosomes towards poles

Solution

As per NCERT, the centromere holds the two sister chromatids together; disc-shaped structures on its sides, the kinetochores, serve as sites of attachment of spindle fibres.

⇒ At anaphase the centromeres split and the spindle fibres attached at the kinetochores pull the chromatids to the opposite poles.

∴ The centromere is required for the movement of chromosomes towards the poles.

Answer: (2)

AIPMT 2005

Keep practising — Cell Cycle and Cell Division

2

In the somatic cell cycle

  1. in G1 phase DNA content is double the amount of DNA present in the original cell
  2. DNA replication takes place in S phase
  3. a short interphase is followed by a long mitotic phase
  4. G2 phase follows mitotic phase
AIPMT 2004
3

If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?

  1. Metaphase
  2. Telophase
  3. Anaphase
  4. Prophase
AIPMT 2004
4

Which one of the following precedes reformation of the nuclear envelope during M phase of the cell cycle?

  1. Decondensation from chromosomes, and reassembly of the nuclear lamina
  2. Transcription from chromosomes, and reassembly of the nuclear lamina
  3. Formation of the contractile ring, and formation of the phragmoplast
  4. Formation of the contractile ring, and transcription from chromosomes
AIPMT 2004
5

Mitotic spindle is mainly composed of which protein?

  1. Actin
  2. Myosin
  3. Tubulin
  4. Myoglobin
AIPMT 2002
6

In which stage of cell cycle, DNA replication occurs?

  1. G1-phase
  2. S-phase
  3. G2-phase
  4. M-phase
AIPMT 2000

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