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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| Column $– I$ | Column $– II$ |
| $(A)\; AUG$ | $(1)$ Phenyl alanine |
| $(B) \;UAA$ | $(2)$ Methionine |
| $(C)\;UUU$ | $(3)$ Tryptophan |
| $(D) \;UGG$ | $(4)$ Stop |
$R$ - The lower the $BOD$ of water, lower is its polluting potentials.