Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

The term chromosome was coined by

  1. Hofmeister

  2. Strasburger

  3. Waldeyer

  4. Laemli
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

Term chromosome was coined by

  1. Hofmeister

  2. Sutton

  3. Boveri

  4. Waldeyer
Reveal answer Fill a bubble to check yourself
D Correct answer
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'

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

Chromosome theory of inheritance was proposed by

  1. Sutton $(1902)$
  2. Boveri $(1902)$
  3. Both Sutton $(1902)$ and Boveri $(1902)$
  4. Correns $(1909)$
Reveal answer Fill a bubble to check yourself
C Correct answer
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)'.

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.'