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12th Biology chapter 6 Bihar board with NCERT-Details & Highlights
| name of content | 12th Biology chapter 6 full solution |
| content | Biology objective type MCQ question with answer |
| name of subjects | class 12 Biology |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th Biology chapter 6 all objective solutions – download PDF
1. Cytosine is 18% in DNA molecule. The percentage of adenine is
-
- ( A ) 64
- ( B ) 36
- ( C ) 82
- ( D ) 32
Answer: (D) 32
2. The sequence of three bases found in the transfer r n 0 a 0 which binds to the messenger r n 0 a 0 codon is called
-
- (A) Triad
- (B) non-sans codon
- (C) Anticodon
- (D) termination codon
Ans: (C) Anticodon
3. Pyrimidine of RNA is found in
-
- (A) Cytosine and Thiamine
- (B) Adenone and Guanine
- (C) cytosine and uracil
- (D) Thymine and Uracil
Answer: (C) Cytosine and Uracil
4. Pyrimidine of DNA is found in
-
- (A) Thiamine and Cytosine
- (B) Adenine and Guanine
- (C) cytosine and uracil
- (D) Thiamine and Uracil
Answer: (A) Thiamine and Cytosine
5. Anticodons are found in
-
- (A) M – RNA ( 9M – RNA )
- (B) in t-RNA ( !-RNA )
- (C) in r – RNA ( r – RNA )
- (D) none of these
Answer: (B) in T-RNA (!-RNA)
6. Nucleoside is
-
- (A) sugar + a nitrogenous base
- (B) Base containing sugar + phosphate
- (C) Nitrogen base + Phosphate rich base
- (D) Sugar + a nitrogenous base + phosphate rich base
Answer: (A) sugar + a nitrogenous base
7. Nucleic acid is a polymer
- (A) Nucleotide
- (B) of nucleoside
- (C) amino acid
- (D) nucleoprotein
Answer: (A) Nucleotide
8. Anticodons are found in
-
- (A) mRNA
- (B) in IRNA
- (C) in IRNA
- (D) all of these
Answer: (C) In IRNA
9. Operon model was proposed
-
- (A) Watson and Creek
- (B) By Nirenberg
- (C) Jacob and Monad
- (D) none of these
Answer: (C) Jacob and Monad
10. How many pairs of nitrogen base are there in one complete rotation of B- D 0 N 0 A ?
-
- ( A ) 5
- ( B ) 10
- ( C ) 15
- ( D ) 20
Answer : ( B ) 10
Bihar Board 12th biology chapter 6 mcq solution
11. Which bond is present between the nitrogenous vessels of nucleic acid?
-
- (A) Peptide binding
- (B) Easter Bandhan
- (C) Both ‘ A ‘ and ‘ B ‘
- (D) Hydrogen bond
Answer: (D) Hydrogen bond
12. How many codes are there in the genetic code?
-
- ( A ) 4
- ( B ) 16
- ( C ) 32
- ( D ) 64
Answer: (D) 64
13. What does the Operon model represent?
-
- (A) Synthesis of genes
- (B) gene expression
- (C) regulation of genes –
- (D) function of genes
Answer: (C) regulation of genes –
14. The process of deriving from D 0 A 0 to M – R 0 N A 0 is called
-
- (A) Transcription
- (B) Easter
- (C) translation
- (D) none of these
Ans: (A) Transcription
15. D 0 N A . Which of the following is finger printing?
-
- (A) DNA Typing
- (B) DNA profiling
- (C) Both ‘ A ‘ and ‘ B ‘
- (D) none of these
Answer: (C) Both ‘A’ and ‘B’
16. Which of the following is involved in the transcription of T – R 0 N A, 5 S – R 0 N A 0 and S 0 N 0 R N A 0 in eukaryotic cells?
-
- (A) R – N – A. polymerase
- (B) RN-A-polymerase
- (C) R – N – A. polymerase
- (D) all of these
Answer: (C) R – N – A. polymerase
17. The non-expression of any gene is accomplished by
-
- (A) Small persons R – N – A. ( RNA )
- (B) Antisemes R – N – A
- (C) Both ‘ A ‘ and ‘ B ‘
- (D) none of these
Answer: (C) Both ‘A’ and ‘B’
18. Which of the following statement is false?
-
- (A) RNA is present in plant viruses
- (B) DNA is present in animal viruses
- (C) double-stranded DNA is present in T.
- (D) double-stranded RNA of TMV is present
Answer: (D) TMV has double-stranded RNA
19. Which of the following is called soluble RNA?
-
- (A) r – RNA
- (B) T – RNA
- (C) m – RNA
- (D) hn – RNA
Answer: (B) T – RNA
20. Which of the following RNA constitutes about 10.20% of the total cellular RNA?
-
- (A) m – RNA
- (B) r – RNA
- (C) I – RNA
- (D) hn – RNA
Answer: (C) I – RNA
BSEB most mcq solution 12th biology chapter 6
21. The codeless DNA sequence is called
-
- (A) exon
- (B) intron
- (C) Cistron
- (D) none of these
Answer: (B) Intron
22. Removal of introns and joining of exons in a certain sequence in a transcription unit is called
-
- (A) Splicing
- (B) intron
- (C) Transformation
- (D) none of these
Answer: (A) Splicing
23. The starting codon is
-
- (A) AUG
- ( B ) UUU
- (C) UAG
- ( D ) AAG
Answer: (A) AUG
24. How many base pairs are there in a complete twist of B – DNA?
-
- ( A ) 10
- ( B ) 12
- ( C ) 20
- ( D ) 15
Answer: (A) 10
25. What connects small pieces of DNA?
-
- (A) DNA polymerase
- (B) RNA polymerase
- (C) Topoisomerase
- (D) DNA CUISITET
Answer: (D) DNA CUISITET
26. Which enzyme plays a major role in DNA duplication?
-
- (A) ligase
- (B) RNA polymerase
- (C) DNA polymerase
- (D) reverse transcriptase
Answer: (C) DNA polymerase
27. Which of the following is a chain termination codon?
-
- (A) AUG
- ( B ) GUG
- (C) UAA
- ( D ) ACC
Answer: (C) UAA
28. By which experiment did Griffith prove that DNA is the genetic material?
-
- (A) Conversion
- (B) Transduction
- (C) Inversion
- (D) translation
Ans: (A) Conversion
29. Which of the following pairs is found in RNA?
-
- (A) adenine and uracil
- (B) Transduction
- (C) Urasol and Cytoline
- (D) translation
Answer: (C) Urasol and Cytoline
30. Which of the following pairs is found in RNA?
-
- (A) Adenine and Thymine
- (B) Guanine and thymine
- (C) adenine and uracil
- (D) Thymine and Cytosine
Answer: (C) adenine and uracil
Important mcq solution 12th biology chapter 6
31. The process of making m-RNA (messenger RNA) from DNA is called
-
- (A) Conversion
- (B) Transduction
- (C) Transcription
- (D) translation
Answer: (C) Transcription
32. In the experiment of Messelson and Stahl, E. coli’s DNA label
-
- (A) heavy nitrogen
- (B) Oxygen
- (C) Radium
- (D) Sulfur
Answer: (A) heavy nitrogen
33. Which RNA has a clover leaf model?
-
- (A) -RNA
- (B) r – RNA
- (C) hn – RNA
- (D) m – RNA
Answer: (A) -RNA
34. Jumping gene was discovered in maize
-
- (A) Go de Breeze
- (B) T-H. by Morgan
- (C) Barbara McClintock
- (D) Mendel
Answer: (C) Barbara McClintock
35. The code sequence of DNA is called
-
- (A) exon
- (B) Inton
- (C) Rose
- (D) Cistron
Answer: (A) Exxon
36. The enzyme participating in transcription is
-
- (A) DNA polymerase.
- (B) DNA polymerase
- (C) RNA polymerase
- (D) DNA polymerase
Answer: (C) RNA polymerase
37. Ratio rule for a caste is
-
- ( A ) T + C / G + A
- ( B ) A + CIT + G
- ( C ) G + G / A + T
- ( D ) A + C / C + T
Answer : ( B ) A + CIT + G
38. DNA repairing takes place
-
- (A) by DNA polymerase 1
- (B) DNA polymerase. By
- (C) Both A and B
- (D) By luggage
Answer: (B) DNA polymerase. By
39. Due to which of the following the diameter of DNA is fixed?
-
- (A) hydrogen bonding between bases
- (B) Phosphodiestera bonds
- (C) disulfide bond
- (D) covalent bond
Answer: (A) Hydrogen bond between bases
40. Which of the following is not a major feature of the organismal code or the genetic code?
-
- (A) defilement
- (B) Ambiguity
- (C) Sovereignty
- (D) Specification
Answer: (D) Specification
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Bihar board 12th science stream subjects wise solution
click here to check out Bihar board science stream all subjects solutions
| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |