Biology

Cell Cycle and Chromosomes

1,219 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

Why can chromosomes be best identified and counted at metaphase?

  1. Because chromosomes are arranged at the equator

  2. Because each chromosome becomes more compact and short

  3. Spindle fibres are attached at each centromere

  4. Chromosomes become thick and long
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chromosomes can be identified and counted because each chromosome becomes more compact and short.

Multiple choice

What happens during telophase?

  1. Nuclear membrane reappears.

  2. Chromosomes form chromatin network.

  3. Spindle fibres disappear.

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

During telophase, nuclear membrane reappears, chromatin network is formed and spindle fibres disappear.

Multiple choice

The human cell contains

  1. 23 chromosomes

  2. 46 chromosomes

  3. 44 chromosomes

  4. 48 chromosomes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cells are the fundamental units of life. The nucleus stores its genetic material in packages called chromosomes. Most people have 46 chromosomes in each cell—23 from their mother and 23 from their father.

Multiple choice

Chromosomes are

  1. constituent of blood which produces heat in the body.

  2. thread-like bodies that occur in the nuclei which carry the genetic code.

  3. parts of the human brain.

  4. none of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A chromosome is an organized structure of DNA and protein found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions. They are thread-like bodies that occur in the nuclei which carry the genetic code.

Multiple choice

Datura is an example of

  1. Monosomy

  2. Eupolidy

  3. Trisomy

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

It is a genetic abnormality in which there are three copies instead of two of a particular chromosome.