Explain the convention for naming EcoRI.
Solution and Explanation
EcoRI: 1. ”E” = Genus (Escherichia). 2. ”co” = Species (coli). 3. ”R” = Strain (RY13). 4. ”I” = First identified enzyme from this strain.
Top Questions on Ecology
- Which of the following is the major characteristic of a temperate forest?
- The term "Biosphere" refers to:
- (a) Indiscriminate human activities such as alien species invasion, fragmentation and habitat loss have accelerated the loss of biodiversity. Justify by taking one example for each. (b) State the importance of the following:
(i) IUCN Red data list
(ii) Hot spots in conservation of biodiversity - Assertion (A): A bioreactor provides the optimal conditions for achieving the desired product by providing optimum growth conditions.
Reason (R): The most commonly used bioreactors are of stirring type. - Identify the ecological pyramid which is generally inverted in a marine ecosystem is
Questions Asked in CBSE CLASS XII exam
Select the correct option for the given isometric projection of combination of solids.
(i) The axis of pyramid is parallel to H.P. and one of its base edges is perpendicular to H.P.
(ii) A sphere of diameter 70 mm is placed on the top face of a prism.
(iii) The axis of pyramid is parallel to V.P. and one of its base edges is perpendicular to V.P.
(iv) The axis of prism is perpendicular to V.P. and one of its base edges is parallel to H.P.
- CBSE CLASS XII - 2025
- Isometric Projection
Identify the correct figure which represents the isometric projection of a vertical square prism placed on a horizontal square slab.
- CBSE CLASS XII - 2025
- Isometric Projection
The above given top view corresponds to
- CBSE CLASS XII - 2025
- Engineering Drawing Skills
Select the correct statements for the given figure.
(i) A horizontal pyramid is placed with its axis parallel to both H.P. and V.P.
(ii) The solid has three triangular faces in total.
(iii) A horizontal pyramid is placed with its axis perpendicular to V.P.
(iv) It is an example of polyhedron.
- CBSE CLASS XII - 2025
- Engineering Drawing Skills
Orthographic projection of a cube is shown as :
- CBSE CLASS XII - 2025
- Engineering Drawing Skills