Biology

Cell Cycle and Chromosomes

1,348 Questions

Explore a curated list of questions covering the cell cycle, mitosis, and meiosis. Topics include DNA replication, chromosomal structures, and genetic disorders. This material is essential for students preparing for biology and general science competitive exams.

Cell cycle eventsDNA replicationMeiosis processChromosomal structuresGenetic disorders

Cell Cycle and Chromosomes Questions

Multiple choice

What precedes reformation of nuclear envelope in M phase?

  1. Decondensation of chromosomes and appearance of nuclear lamina

  2. Transcription of chromosomes and reassembly of nuclear lamina

  3. Formation of phragmoplast and contraction ring

  4. Formation of contraction ring and transcription from chromosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

   

Multiple choice

Mitotic anaphase differs from metaphase in possessing

  1. same number of chromosomes and same number of chromatids

  2. half the number of chromosomes and half the number of chromatids

  3. half the number of chromosomes and same number of chromatids

  4. same number of chromosomes and half the number of chromatids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In anaphase, there are same number of chromosomes and half the number of chromatids.

Multiple choice

Mitogens are the agents that induce

  1. amitosis

  2. mitosis

  3. meiosis

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A mitogen is a chemical substance that encourages a cell to commence cell division, triggering mitosis. A mitogen is usually some form of a protein. Mitogenesis is the induction (triggering) of mitosis, typically via a mitogen. 

Multiple choice

During the meiotic division, the

  1. homologous chromosomes are separated

  2. linkage is disturbed

  3. homologous chromosomes do not segregate

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During the meiotic division, the homologous chromosomes are separated.

Multiple choice

Dinomitosis is known for the failure of the occurrence of

  1. mitosis

  2. meiosis I

  3. meiosis II

  4. amitosis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dinomitosis is known for the failure of the occurrence of meiosis II. Dinomitosis is a type of cellular division that solely occurs in the class Dinophyceae, a class of Alga with chlorophyll c. 

Multiple choice

Which of the following is a web-based resource and database of genomic variation data from analysis of patient DNA?

  1. OMIM

  2. DECIPHER

  3. ModBase

  4. Virtual karyotype

  5. UCSC
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DECIPHER is a web-based resource and database of genomic variation data from analysis of patient DNA. It documents submicroscopic chromosome abnormalities (microdeletions and duplications) and pathogenic sequence variants (single nucleotide variants - SNVs, Insertions, Deletions, InDels), from over 25000 patients and maps them to the human genome using Ensembl or UCSC Genome Browser.