CBSE Class 12 Biology Molecular Basis of Inheritance (2). 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 Write the two specific codons that a translational unit of mRNA is flanked by one on either sides.
2 Define nucleosome.
3 State the central dogma of molecular biology.
4 Name the enzyme responsible for synthesis of new DNA strand during DNA replication
5 Distinguish between euchromatin and heterochromatin.
6 State the functions of Ribozyme and release factor in protein synthesis respectively.
7 Differentiate between exons and introns.
8 How do histones acquire positive charge?
9 Both the strands of DNA are not copied during transcription. Give reason.
10 Transcription and translation are coupled in prokaryotes. Comment on the statement.
11 The base sequence in one of the strands of DNA is TAGCATGAT 3 (i) Give the base sequence of its complementary strand. (ii) How are these base pairs held together in a DNA molecule ? (iii) Explain the base complementarity rules. Name the scientist who framed this rule.
12 Draw a neat labeled sketch of replicating fork of DNA replication.
13 How would lac operon operate in E.coli growing in a culture medium where lactose is present as source of sugar?
14 a) What are the transcriptional products of RNA polymerase III ? (b)Differentiate between ‘Capping’ and ‘Tailing’. (c) Expand hnRNA.
15 a) Construct a complete transcription unit with promoter and terminator based on the hypothetical template strand given below.
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