This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If the sequence of bases in the coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be: A) AUUCGAUG. B) TAAGCTAC. C) UAAGCUAC. D) ATTCGATG. Show Answer Correct Answer: A) AUUCGAUG. 2. DNA is a polymer of nucleotides which are linked to each other by 3'-5' phosphodiester bond. To prevent polymerisation of nucleotides, which of the following modifications would you choose? A) Replace purine with pyrimindines. B) Remove/Replace 3' OH group in deoxy ribose. C) Remove/Replace 2' OH group with some other group in deoxy ribose. D) Both (b) and (c). Show Answer Correct Answer: B) Remove/Replace 3' OH group in deoxy ribose. 3. The deflection of pitch angle between two successive steps (rungs) of DNA is A) 72$^{o}$. B) 54$^{o}$. C) 36$^{o}$. D) 18$^{o}$. Show Answer Correct Answer: C) 36$^{o}$. 4. RNA is the genetic material in A) Prokaryotes. B) Eukaryotes. C) Tabacco Mosaic Virus (TMV). D) E.coli. Show Answer Correct Answer: C) Tabacco Mosaic Virus (TMV). 5. Which of the following are Chargaff rules A) Purine = pyrimidine. B) Sugar = phosphate. C) A+T/G+C=Constant. D) All of these. Show Answer Correct Answer: D) All of these. 6. The length of DNA has 45000 base pairs. How many complete turns will the DNA molecule take? A) 45000. B) 450. C) 4500. D) 45. Show Answer Correct Answer: C) 4500. 7. In the base sequence of one strand of DNA isGAT, TAG, CAT, GAC what shall be thesequence of its complementary strand- A) CAT, CTG, ATC, GTA. B) GTA, ATC, CTG, GTA. C) ATC, GTA, CTG, GTA. D) CTA, ATC, GTA, CTG. Show Answer Correct Answer: D) CTA, ATC, GTA, CTG. 8. Why is only one strand of DNA copied during transcription? A) To form double-stranded RNA. B) To prevent mutations. C) To increase protein diversity. D) To simplify genetic information transfer. Show Answer Correct Answer: D) To simplify genetic information transfer. 9. Which of the following effects might be caused by reduced or very little active telomerase activity? A) Cells age and begin to lose function. B) Cells maintain normal functioning. C) Telomere lengthens in germ cells. D) Cells may become cancerous. Show Answer Correct Answer: A) Cells age and begin to lose function. 10. One complete turn of DNA contains A) 5 bp. B) 10 bp. C) 20 bp. D) 30 bp. Show Answer Correct Answer: B) 10 bp. 11. In E. coli, there is a mutation in a gene called dnaB that alters the DNA helicase that normally acts at the origin. Which of the following would you expect as a result of this mutation? A) Replication will occur via RNA polymerase alone. B) The DNA will supercoil. C) No replication fork will be formed. D) No proofreading will occur. Show Answer Correct Answer: C) No replication fork will be formed. 12. Which of the following is a stop codon? A) AAA. B) UGA. C) AUG. D) UGC. Show Answer Correct Answer: B) UGA. 13. Statement I:The two strands of DNA are parallel to each other with both the strands running in 3' $\rightarrow$ 5' direction.Statement II:Complementary base pairing between Adenine with guanine and cytosine with thymine is present in DNA. A) Both the statements are correct. B) Statement I is correct, while statement II is incorrect. C) Statement I is incorrect, while statement II is correct. D) Both the statements are incorrect. Show Answer Correct Answer: D) Both the statements are incorrect. 14. The histone proteins present in a histone octamer are A) H2A, H2B, H2C, H3. B) H2A, H2B, H1, H3. C) H2A, H2B, H3, H4. D) None of the above. Show Answer Correct Answer: C) H2A, H2B, H3, H4. 15. DNA and RNA are macromolecules in the category of A) Proteins. B) Lipids. C) Nucleic Acids. D) Carbohydrates. Show Answer Correct Answer: C) Nucleic Acids. 16. In lac operon, RNA polymerase binds to A) Operator gene. B) Promoter gene. C) Regulator gene. D) Lac Z gene. Show Answer Correct Answer: B) Promoter gene. 17. Which of these is true about HGP? A) Its goal was to identify the non-coding parts. B) Its goal was to store information in libraries for easy access. C) Target to improve tools for analysis. D) BYpass ELSI and successfully apply the data. Show Answer Correct Answer: C) Target to improve tools for analysis. 18. Name the scientists who proved that DNA replication was semi conservative A) Kornberg. B) Chargaff. C) Meselson and Stahl. D) Watson and Crick. Show Answer Correct Answer: C) Meselson and Stahl. 19. DNA polymerase A) DNA polymerase is a type of lipid molecule. B) DNA polymerase is involved in photosynthesis. C) DNA polymerase is an enzyme responsible for synthesizing new DNA strands by adding nucleotides to the existing DNA template during DNA replication. D) DNA polymerase is found in the cell membrane. Show Answer Correct Answer: C) DNA polymerase is an enzyme responsible for synthesizing new DNA strands by adding nucleotides to the existing DNA template during DNA replication. 20. Translation occurs in A) Nucleus. B) Cytoplasm. C) Nucleolus. D) Lysosome. Show Answer Correct Answer: B) Cytoplasm. 21. The mutations that involve addition, deletion or substitution of a single pair in a gene are referred to as A) Point mutations. B) Lethal mutations. C) Silent mutations. D) Retrogressive mutations. Show Answer Correct Answer: A) Point mutations. 22. Which process is unique to eukaryotic transcription but absent in bacterial transcription? A) Use of DNA as a template. B) Coupling of transcription and translation. C) MRNA capping and polyadenylation. D) Synthesis of RNA in the 5'$\rightarrow$3' direction. Show Answer Correct Answer: C) MRNA capping and polyadenylation. 23. Consider Griffith's experiments on transformation in Streptococcus pneumoniae. Now imagine that you are extending these experiments by injecting a mixture of heat killed strain R bacteria and live strain S bacteria into a mouse. The result will be that the mouse will ..... , and you will find live strain ..... bacteria in its blood. A) Die, R. B) Live, R. C) Die, S. D) Live, S. Show Answer Correct Answer: C) Die, S. 24. Out of 64 codons how many of them code for amino acids? A) 64. B) 20. C) 61. D) 32. Show Answer Correct Answer: C) 61. 25. The final proof for DNA as the genetic material come from experiments of A) Griffith. B) Hershey and Chase. C) Avery, Macleod and McCarty. D) Hargobind Khorana. Show Answer Correct Answer: B) Hershey and Chase. ← PreviousNext →Related QuizzesClass 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 1Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 2Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 3Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 5Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 6Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 7Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 8Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 9Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 10Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books