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

Which of the following statements is CORRECT regarding normal gestation in humans?

  1. Sex-determining region Y (SRY) protein, is a RNA-binding protein in males.

  2. SRY is located on the X chromosome.

  3. In the absence of SRY, a female phenotype will develop.

  4. Only one X chromosome is necessary for normal ovarian development.

  5. In the presence of SRY, a female phenotype will develop.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the absence of a Y chromosome, the fetus develops ovaries and female phenotypes. Hence, SRY switches on the male sex determination.

Multiple choice

Chromosomes are made up of

  1. Lipids and fats

  2. Nucleic acids and proteins

  3. Polymers of steroids

  4. Starch and cellulose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ans - 2

Multiple choice

Lampbrush chromosomes are a special type of chromosomes found in

  1. salivary gland cells of dipterans

  2. amphibian oocytes

  3. gonadal cells of reptiles

  4. brain stem cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lampbrush chromosomes are a special type of chromosomes found in amphibian oocytes. They are found during the prolonged diplotene stage of first meiotic division in primary oocytes of amphibians. 

Multiple choice

Turner's syndrome, a human adnormality in which the affected individuals are phenotypically females but have rudimentary sex organs and mammary glands is caused by the absence of

  1. One X-chromosome

  2. Y-chromosome

  3. Both X-chromosome

  4. XY-chromosome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Turner’s syndrome is a human adnormality in which the affected individuals are pheotypically females but have rudimentary sex organs and mammary glands is caused by the absence of one X-chromosome. Turner’s syndrome is characterised by monosomy of XO type. 

Multiple choice

The number of chromosomes in Klinefelter's syndrome is

  1. 47

  2. 46

  3. 45

  4. 44
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Klinefelter's syndrome individual has 47 chromosomes (44+ XXY). Such persons are sterile males with undeveloped testes, sparse body hair, mental retardation, long limbs and some female characters.

Multiple choice

The theory explaining that the ratio between the number of X-chromosomes and the number of complete sets of autosomes will determine the sex is known as

  1. chromosome theory of sex determination

  2. genic balance theory of sex determination

  3. hormone balance theory of sex determination

  4. environmental sex determination theory
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The theory where ratio between the number of X-chromosomes and number of complete sets of autosomes will determine the sex is known as genic balance theory of sex determination. The X-chromosome is believed to carry female tendency genes, while autosomes carry male tendency genes.