Isolation of DNA from a plant cell can be achieved by using:
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- Chitinase
- Lysozyme
- Cellulase
- Pectinase
The Correct Option is C
Solution and Explanation
Top Questions on 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
- 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
Questions Asked in CBSE CLASS XII exam
- A coil of 60 turns and area \( 1.5 \times 10^{-3} \, \text{m}^2 \) carrying a current of 2 A lies in a vertical plane. It experiences a torque of 0.12 Nm when placed in a uniform horizontal magnetic field. The torque acting on the coil changes to 0.05 Nm after the coil is rotated about its diameter by 90°. Find the magnitude of the magnetic field.
- CBSE CLASS XII - 2025
- Magnetism and matter
- If \( x = e^{\frac{x}{y}} \), then prove that \( \frac{dy}{dx} = \frac{x - y}{x \log x} \).
- CBSE CLASS XII - 2025
- Differentiation
- Nandita and Prabha were partners in a firm. Nandita withdrew Rs 3,00,000 during the year for personal use. The partnership deed provides for charging interest on drawings @ 10\% p.a. Interest on Nandita's drawings for the year ended 31st March, 2024 will be :
- CBSE CLASS XII - 2025
- Partnership Accounts
Answer the following questions:
- [(i)] Describe the population growth curve applicable in a population of any species in nature that has unlimited resources at its disposal.
- [(ii)] Explain the equation of this growth curve.
- [(iii)] Name the growth curve and depict a graphical plot for this type of population growth.
- [(i)] Explain the conclusion drawn by Alexander von Humboldt during his extensive explorations in the wilderness of South American jungles.
- [(ii)] Give the equation of the Species-Area relationship.
- [(iii)] Draw a graphical representation of the relation between species richness and area for a wide variety of taxa such as birds, bats, etc.
- CBSE CLASS XII - 2025
- Organisms and Populations
Student to attempt either option (A) or (B):
(A) Give an account of the generalised structure of an antibody molecule produced by B-lymphocytes in response to the pathogen.
OR
(B) Other than public awareness and counselling, enlist four measures taken up by NACO, WHO and other NGOs to prevent the spread of HIV infection in the society.- CBSE CLASS XII - 2025
- human health and disease