MCQ
Chromosomes were first seen by:
- AHofmeister
- BWaldeyer
- CWalter S. Sutton
- DCrick and Watson
Explanation:
A. Wilhelm Friedrich Benedikt Hofmeister was a German biologist and botanist who observed structures (which later came to be known as chromosomes) in a dividing cell nucleus in 1848.
B. W. Waldeyer coined the term chromosomes for these darkly stained rod-like structures in the year 1888.
C. Water S Sutton and Boveri described chromosomes as physical structures which are messengers of heredity.
D,. Watson and Crick studied the structure of the DNA molecule.
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| $(a)$ Bacillus thuringiensis | $(i)$ Cloning vector |
| $(b)$ Thermus aquaticus | $(ii)$ Construction of first $rDNA$ molecule |
| $(c)$ Agrobacterium tumefaciens | $(iii)$ $DNA$polymerase |
| $(d)$ Salmonella typhimurium | $(iv)$ Cry proteins |
Select the correct option from the following:
$(a)\quad(b)\quad(c)\quad(d)$