Class 12th Biology 2017 Set2 Outside Delhi Board Paper Solution

Question 25

What is an operon ?

Answer

An operon is a polycistronic structural gene which is regulated by a common promoter and regulator gene.

Previous Question Next Question

Popular Questions of Class 12th biology

Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
Q:- Why is reproduction essential for organisms? Answer
Q:- Write a short note on
(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals.
Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
Q:- What is DNA fingerprinting? Mention its application.
Q:- What is oogenesis? Give a brief account of oogenesis.
Q:- Describe the structure of a seminiferous tubule.
Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
Q:- Explain the Law of Dominance using a monohybrid cross.

Recently Viewed Questions of Class 12th biology