The first antibiotic was discovered accidentally by A while working on B. ‘A’ and ‘B’ are:
Show Hint
A – Waksman; B – Streptococcus
A – Fleming; B – Penicillium notatum
A – Waksman; B – Bacillus brevis
A – Fleming; B – Staphylococci
The Correct Option is D
Solution and Explanation
Step 1: Discovery of the first antibiotic.
Alexander Fleming discovered the first antibiotic, penicillin, in 1928.
Step 2: Observation during research.
He observed that a mold,Penicillium notatum, inhibited the growth of Staphylococci bacteria.
Top Questions on Antibiotics
- Which of the following precursors is added to the medium to get penicillin G?
- AP PGECET - 2025
- Biotechnology
- Antibiotics
- Which of the following antibiotics is produced by chemical synthesis?
- AP PGECET - 2025
- Biotechnology
- Antibiotics
- (a) “Farmers prefer apomictic seeds to hybrid seeds.” Justify giving two reasons.
- CBSE CLASS XII - 2024
- Biology
- Antibiotics
- Whose skulls ‘A’, ‘B’, and ‘C’ are shown below? Which of the two are more similar to each other?
\begin{figure}[h!] \centering \includegraphics[width=0.8\textwidth]{Screenshot 2025-01-16 122426.png} \caption{Skull} \end{figure}- CBSE CLASS XII - 2024
- Biology
- Antibiotics
Differentiate between spermatogenesis and oogenesis in humans on the basis of the following:
(a) When the process is initiated.
- CBSE CLASS XII - 2024
- Biology
- Antibiotics
Questions Asked in CBSE CLASS XII exam
- Find the value of $x$, if \[ \begin{bmatrix} 1 & 3 & 2 \\ 2 & 5 & 1 \\ 15 & 3 & 2 \end{bmatrix} \begin{bmatrix} 1 \\ x \\ 2 \end{bmatrix} = \begin{bmatrix} 0 \\ 0 \\ 0 \end{bmatrix} \]
- Two point charges of \( -5\,\mu C \) and \( 2\,\mu C \) are located in free space at \( (-4\,\text{cm}, 0) \) and \( (6\,\text{cm}, 0) \) respectively.
(a) Calculate the amount of work done to separate the two charges at infinite distance.
(b) If this system of charges was initially kept in an electric field \[ \vec{E} = \frac{A}{r^2}, \text{ where } A = 8 \times 10^4\, \text{N}\,\text{C}^{-1}\,\text{m}^2, \] calculate the electrostatic potential energy of the system.- CBSE CLASS XII - 2025
- Electrostatics
- 4,000 shares of ₹ 10 each were forfeited for non-payment of second and final call money of ₹ 2 per share. The minimum amount that the company must collect at the time of reissue of these shares will be :
- CBSE CLASS XII - 2025
- Accounting for Share Capital
- If $y = a \cos(\log x) + b \sin(\log x)$, then $x^2y'' + xy'1$ is:
- CBSE CLASS XII - 2025
- Continuity and differentiability
A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?
- CBSE CLASS XII - 2025
- Application of derivatives