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 botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Swellings present over the chromosomes are

  1. Centromeres

  2. Centrosome

  3. Puffs

  4. Chromomeres
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The centromere is the specialized DNA sequence of a chromosome that links a pair of sister chromatids
During mitosis, spindle fibers attach to the centromere via the kinetochore.
Centromeres were first thought to be genetic loci that directs the behavior of chromosomes
So, the correct answer is 'Centromeres'
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Kinetochore is 

  1. Granule within centromere

  2. Surface of centromere

  3. Constriction near chromosome end

  4. End of chromosome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The centromere is the lighter staining region on the chromosome of a cell which appears as a constriction.
They are also known as a primary constriction or kinetochore.
The kinetochore is a proteinaceous structure that assembles at the surface of the centromere which forms the site for binding of spindle fibres during cell division.
So, the correct answer is 'Surface of centromere'.
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

A constriction on the chromosome is

  1. Centromere

  2. Centrosome

  3. Centriole

  4. Chromomere.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The centromere is the lighter staining region on the chromosome of a cell which appears as a constriction.
  • They are also known as a primary constriction or kinetochore.
  • It is a specialized DNA sequence that links a pair of sister chromatids where the spindle fibres are attached during cell division.
  • It is responsible for the transfer of replicated chromosomes into the two daughter cells during the cell division.
  • So, the correct answer is 'Centromere'
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Satellite means

  1. Terminal part of the chromosome beyond secondary constriction

  2. Terminal part of the chromosome beyond primary constriction

  3. Terminal part of chromosome beyond tertiary constriction

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Satellite chromosomes or SAT chromosomes are those chromosomes which have secondary constrictions other than a centromere.
  • The terminal end of the chromosome present beyond the secondary constriction is called satellite which is attached to the chromosome by a thin thread called chromatin.
  • So, the correct answer is 'Terminal part of the chromosome beyond the secondary constriction'.
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Which one is present on chromosome?

  1. Centromere

  2. Centrosome

  3. Nucleus

  4. Golgi body
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The centromere is the lighter staining region present on the chromosome of a cell which appears as a constriction.
  • They are also known as a primary constriction or kinetochore.
  • It is a specialized DNA sequence that links a pair of sister chromatids where the spindle fibres are attached during cell division.
  • So, the correct answer is 'Centromere'.
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Sister chromatids are joined at

  1. Chromocentre

  2. Metacentre

  3. Centromere

  4. Telomere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The specialized DNA sequence that links a pair of sister chromatids where the spindle fibres are attached during cell division is known as a centromere.
  • It is the lighter staining region on the chromosome of a cell which appears as a constriction.
  • They are also known as a primary constriction or kinetochore.
  • So, the correct answer is 'Centromere'.
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Kinetochore is

  1. Granule within centromere

  2. Surface of centromere

  3. Constriction near chromosome end

  4. End of chromosome
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The centromere is the lighter staining region on the chromosome of a cell which appears as a constriction.
  • They are also known as a primary constriction or kinetochore.
  • The kinetochore is a proteinaceous structure that assembles at the surface of the centromere which forms the site for binding of spindle fibres during cell division.
  • So, the correct answer is 'Surface of centromere'.
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

More than $200$ chromosomes occur in

  1. Chicken

  2. Dog

  3. Amoeba

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

1) Chicken has a diploid number of 78 (2n = 78).

2) Dog has a diploid number of 78 (2n=78).
3) The genome for Amoeba proteus is very large containing over 290 billion base pairs in its genome. The Amoeba proteus has more than 500 chromosomes in a single nucleus.
4) Gorilla has a diploid number of 48 (2n=48).
So, the correct answer is 'Amoeba'.

Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Kinetochore is?

  1. Surface of centromere

  2. Trilaminar plate over centromere

  3. End of chromosome

  4. Constriction near chromosome end
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The centromere is the lighter staining region on the chromosome of a cell which appears as a constriction.
They are also known as a primary constriction or kinetochore.
The kinetochore is a proteinaceous structure that assembles at the surface of the centromere which forms the site for binding of spindle fibres during cell division.
So, the correct answer is 'Surface of centromere'.
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Somatic chromosome number is 40.What shall be chromosome number in the cells seminiferous tubule ?

  1. 40

  2. 20

  3. 10

  4. 40 and 20
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Somatic cell is diploid (2n) in nature. It is given that the number of somatic chromosomes is 40. Seminiferous tubules contain haploid (n) spermatozoa. These spermatozoa are haploid in nature.
Hence, the number of chromosomes in the cells of seminiferous tubules will be 20.
Thus, the correct answer is '20.'