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ISC Class XII Board Specimen 2022 : Biology [Semester 1]

14 pages, 70 questions, 8 questions with responses, 8 total responses,

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ISC SEMESTER 1 EXAMINATION SPECIMEN QUESTION PAPER BIOLOGY PAPER 1 (THEORY) -----------------------------------------------------------------------------------------------Maximum Marks: 70 Time allowed: One and a half hours (Candidates are allowed additional 15 minutes for only reading the paper.) ALL QUESTIONS ARE COMPULSORY Each Question / Subpart of a question carries one mark. ---------------------------------------------------------------------------------------------------------------Select the correct option for each of the following questions. ---------------------------------------------------------------------------------------------------------------Answer the questions given below by choosing the correct option Question 1 Which of the following steps in transcription is catalysed by RNA polymerase? (a) Initiation (b) Elongation (c) Termination (d) All of the above Question 2 In a DNA strand the nucleotides are linked together by (a) glycosidic bonds (b) phosphodiester bonds (c) peptide bonds (d) hydrogen bonds Question 3 If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is: 5 ATGAATG 3 , the sequence of bases in its RNA transcript would be: (a) 5 AUG A AUG 3 (b) 5 UACUU AC 3 (c) 5 CAUUCAU 3 (d) 5 GUAAGUA 3

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