MCQ
Penicillin is the first antibiotic. It was discovered by
- ✓Alexander Flemming $:\, 1928$
- BAlexander Flemming $:\, 1930$
- CS Waksman $:\, 1928$
- DS Waksman $: \,1930$
✓
Answer
Correct option: A.
Alexander Flemming $:\, 1928$
a
Penicillin was the first antibiotic to be discovered by Alexander Flemming $(1928)$
Penicillin was the first antibiotic to be discovered by Alexander Flemming $(1928)$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The nuclei of the sperm and egg fuse as a result of
In the pedigree analysis, the symbol shown below represent
Gametes of threatened species can be preserved in viable and fertile condition for long periods using
If two persons with $‘AB’$ blood group marry and have sufficiently large number of children, these children could be classified as $‘A’$ blood group: $‘AB’$ blood group : $‘B’$ blood group in $1 : 2 : 1$ ratio. Modern technique of protein electrophoresis reveals presence of both $‘A’$ and $‘B’$ type proteins in $‘AB’$ blood group individuals.This in an example of
→Read the following statements:
→$A.$ Variation at genetic level arises due to mutations.
$B.$ Technique of $DNA$ fingerprinting was initially developed by Alec Jeffreys
Match the trophic levels with their correct species examples in grassland ecosystem.
→| $(a)$ Fourth trophic level | $(i)$ Crow |
| $(b)$ Second trophic level | $(ii)$ Vulture |
| $(c)$ First trophic level | $(iii)$ Rabbit |
| $(d)$ Third trophic level | $(iv)$ Grass |
Select the correct option :
$(a)\quad(b) \quad(c) \quad(d)$
Frequency of crossing over in a chromosome is an index of
Both husband and wife have normal vision though their fathers were colourblind and mothers did not have any gene for colour blindness. The probability of their daughter becoming colourblind is
Which of the following most often limits the primary productivity of the ecosystem?
Surrogate mother is: