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Cell Cycle and Cell Division · Question 68

AIPMT 2005MCQEasy📈 Topic in 62% papers+4−1
1

At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

  1. During G2 stage of prophase
  2. During S-phase
  3. During entire prophase
  4. During telophase

Answer

(2) During S-phase

Solution

As per NCERT, DNA replication takes place during the S or synthesis phase of interphase, and the amount of DNA per cell doubles.

⇒ The new DNA must be packed into nucleosomes at once, so the histone proteins needed for this are synthesised in the same phase.

∴ Histone proteins are synthesised during the S-phase.

Answer: (2)

AIPMT 2005

Keep practising — Cell Cycle and Cell Division

2

Centromere is required for -

  1. Crossing over
  2. Movement of chromosomes towards poles
  3. Transcription
  4. Cytoplasmic cleavage
AIPMT 2005
3

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
4

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
5

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
6

Mitotic spindle is mainly composed of which protein?

  1. Actin
  2. Myosin
  3. Tubulin
  4. Myoglobin
AIPMT 2002
7

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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