The most widely used transgenic animal for testing the safety of vaccine before they are used in humans is:
Show Hint
- Rabbits
- Pigs
- Sheep
- Mice
The Correct Option is D
Solution and Explanation
Top Questions on Biotechnology
- An application of biotechnology in agriculture involves the production of pest-resistant plants, using "cry" gene from a bacterium, \textit{Bacillus thuringiensis.} (a) Proteins coded by which specific Bt. toxin gene control corn borer? (b) How does Bt. toxin produced by the bacterium kill the insect? Explain.
- CBSE CLASS XII - 2025
- Biology
- Biotechnology
Answer the following questions:
[(i)] Explain why the insecticidal protein produced by Bacillus thuringiensis does not kill the bacteria itself.
[(ii)] How has man exploited this protein to produce cotton bollworm-resistant Bt cotton plant?
[(i)] Identify the selectable markers labelled as ‘a’ and ‘b’ in the given diagram of E. coli vector.
[(ii)] How is the coding sequence of enzyme \(\beta\)-galactosidase considered a better marker than the ones identified by you in the diagram? Explain.
[(iii)] List any two uses of cloning vectors in biotechnology.- CBSE CLASS XII - 2025
- Biology
- Biotechnology
- Assertion (A): To generate only a part of the plant from a cell is totipotency.
Reason (R): Suitable special nutrient media and sterile conditions are required in ‘in vitro’ conditions for the division of cells in explants.- CBSE CLASS XII - 2025
- Biology
- Biotechnology
- (a) (i) Give the full form of ‘ELISA’. Write the principle on which ELISA test is based.
(ii) Describe all the methods used to treat or cure Adenosine deaminase deficiency in humans.- CBSE CLASS XII - 2025
- Biology
- Biotechnology
- Explain the process of separation and isolation of DNA fragments by a typical gel electrophoresis.
- CBSE CLASS XII - 2025
- Biology
- Biotechnology
Questions Asked in CBSE CLASS XII exam
(a) Calculate the standard Gibbs energy (\(\Delta G^\circ\)) of the following reaction at 25°C:
\(\text{Au(s) + Ca\(^{2+}\)(1M) $\rightarrow$ Au\(^{3+}\)(1M) + Ca(s)} \)
\(\text{E\(^\circ_{\text{Au}^{3+}/\text{Au}} = +1.5 V, E\)\(^\circ_{\text{Ca}^{2+}/\text{Ca}} = -2.87 V\)}\)
\(\text{1 F} = 96500 C mol^{-1}\)- CBSE CLASS XII - 2025
- Electrochemistry
Define the following:
(i) Cell potential
(ii) Fuel Cell- CBSE CLASS XII - 2025
- Electrochemistry
Calculate the emf of the following cell at 25°C:
\[ \text{Zn(s)} | \text{Zn}^{2+}(0.1M) || \text{Cd}^{2+}(0.01M) | \text{Cd(s)} \] Given: \[ E^\circ_{\text{Cd}^{2+}/\text{Cd}} = -0.40 \, V, \, E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \, V \] \[ [\log 10 = 1] \]- CBSE CLASS XII - 2025
- Electrochemistry
Write chemical equations of the following reactions:
(i) Phenol is treated with conc. HNO\(_3\)
(ii) Propene is treated with B\(_2\)H\(_6\) followed by oxidation by H\(_2\)O\(_2\)/OH\(^-\)
(iii) Sodium t-butoxide is treated with CH\(_3\)Cl- CBSE CLASS XII - 2025
- Alcohols, Phenols And Ethers
Give a simple chemical test to distinguish between butan-1-ol and butan-2-ol.
- CBSE CLASS XII - 2025
- Alcohols, Phenols And Ethers