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Cell Cycle and Cell Division · Question 66

AIPMT 2009MCQEasy📈 Topic in 75% papers+4−1
1

Synapsis occurs between

  1. mRNA and ribosomes
  2. spindle fibres and centromere
  3. two homologous chromosomes
  4. a male and a female gamete

Answer

(3) two homologous chromosomes

Solution

As per NCERT, during zygotene of prophase I, chromosomes start pairing together, and this process of association is called synapsis; such paired chromosomes are called homologous chromosomes.

⇒ Synapsis is accompanied by the formation of the synaptonemal complex, and the complex of a pair of synapsed homologous chromosomes is called a bivalent or tetrad.

∴ Synapsis occurs between two homologous chromosomes.

Answer: (3)

AIPMT 2009

Keep practising — Cell Cycle and Cell Division

2

Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle? [figure]

  1. C - karyokinesis
  2. D - synthetic phase
  3. A - cytokinesis
  4. B - metaphase
AIPMT 2009
3

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
AIPMT 2005
4

Centromere is required for -

  1. Crossing over
  2. Movement of chromosomes towards poles
  3. Transcription
  4. Cytoplasmic cleavage
AIPMT 2005
5

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
6

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
7

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
8

Mitotic spindle is mainly composed of which protein?

  1. Actin
  2. Myosin
  3. Tubulin
  4. Myoglobin
AIPMT 2002
9

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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