CBSE Class 12 Biology Molecular Basis of Inheritance (1). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
1.Why is regulation of lac operon said to be negative control?
2.Given below is a part of the template strand of a structural gene TAC CAT TAG GAT
a) Write its transcribed mRNA strand with its polarity.
Explain the mechanism involved in initiation of transcription of this strand
3.a)Explain Griffith’s experiments where he witnessed transformation in bacteria he worked with. b) Name the scientists responsible for determining the biochemical nature of “transforming principle” in Griffith’s experiments. What did they prove?
1. Describe the experiment conducted by Alfred Hershey and Martha Chase for identification of genetic material.
2. Why is it considered path breaking in the field of molecular biology.
Where are anticodons seen? What is the codon of anticodon AUG?
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