Tag: the mitotic cell cycle

Questions Related to the mitotic cell cycle

Which one is present on chromosome?

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

  1. Centromere

  2. Centrosome

  3. Nucleus

  4. Golgi body

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Correct Option: A
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'.

Sister chromatids are joined at

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

  1. Chromocentre

  2. Metacentre

  3. Centromere

  4. Telomere

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Correct Option: C
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'.

A duplicated chromosome has how many chromatids

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

  1. One

  2. Two

  3. Three

  4. Four

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Correct Option: B

Kinetochore is

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

  1. Granule within centromere

  2. Surface of centromere

  3. Constriction near chromosome end

  4. End of chromosome

Show answer
Correct Option: B
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'.

Which statement is not correct

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

  1. Histones rich in arginine are $H _3$ and $H _4$

  2. Nucleolar organiser is found in the secondary constriction of a chromosome

  3. Polytene chromosomes are found in Chironomus

  4. B-chromosomes are genetically active.

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Correct Option: B

The term chromosome was coined by

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

  1. Hofmeister

  2. Strasburger

  3. Waldeyer

  4. Laemli

Show answer
Correct Option: C
Explanation:
  • Chromosomes can be defined as thread-like structure which contains DNA and proteins which are found in the nucleus of most living cells.
  • They carry the genetic information in the form of genes.
  • The word chromosome is derived from the Greek word chroma meaning "colour" and soma meaning "body".
  • The term was coined by von Waldeyer-Hartz in relation to the term chromatin which was introduced by Walther Flemming.
  • So, the correct answer is 'Waldeyer'.

Term chromosome was coined by

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

  1. Hofmeister

  2. Sutton

  3. Boveri

  4. Waldeyer

Show answer
Correct Option: D
Explanation:

The term "chromosome" (comes from the Greek word "chroma" meaning colour and "soma" meaning "body", describing their strong staining by particular dyes) was first suggested in 1888 by the German anatomist Heinrich Wilhelm Gottfried von Waldeyer-Hartz.


So, the correct answer is 'Waldeyer'

Chromosome theory of inheritance was proposed by

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

  1. Sutton $(1902)$

  2. Boveri $(1902)$

  3. Both Sutton $(1902)$ and Boveri $(1902)$

  4. Correns $(1909)$

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Correct Option: C
Explanation:

Chromosome theory of inheritance or Boveri–Sutton chromosome theory is a fundamental unifying theory of genetics which identifies chromosomes as the carriers of genetic material

So, the correct answer is 'Both Sutton (1902) and Boveri (1902)'.

More than $200$ chromosomes occur in

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

  1. Chicken

  2. Dog

  3. Amoeba

  4. Gorilla

Show answer
Correct Option: C
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'.

Chromosomes were first seen by

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

  1. Hofmeister

  2. Waldeyer

  3. Strasburger

  4. Flemming

Show answer
Correct Option: A
Explanation:

Wilhelm Friedrich Benedikt Hofmeister observed chromosomes in a dividing cell nucleus in 1848.


So, the correct answer is 'Hofmeister'