This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 30 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 30 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Watson and Crick double helical DNA is a A) A DNA. B) B DNA. C) Z DNA. D) None of the above. Show Answer Correct Answer: B) B DNA. 2. HGP also focussed on identifying A) SNPS. B) VNTRS. C) Minisatellite. D) Junk DNA. Show Answer Correct Answer: A) SNPS. 3. Which is the soluble RNA? A) T rna. B) Hn rna. C) S rna. D) M rna. Show Answer Correct Answer: A) T rna. 4. The lac operon is an example of inducible operon. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. Arrange them on the basis of increasing size: A) Nucleotide, chromosome, gene, genome. B) Genome, chromosome, Nucleotide gene. C) Nucleotide, genome, gene, chromosome. D) Nucleotide, gene, chromosome, genome. Show Answer Correct Answer: D) Nucleotide, gene, chromosome, genome. 6. In eukaryotes, three different RNA polymerases are involved in the synthesis of a different class of RNAs namely:rRNA, tRNA, and mRNA. The RNA polymerase that is required for the synthesis of mRNA is A) RNA polymerase I. B) RNA polymerase II. C) RNA polymerase III. D) None of the above. Show Answer Correct Answer: B) RNA polymerase II. 7. MRNA bearing multiple ribosomes is known as ..... A) Polysome. B) Polyamine-ribosome complex. C) MRNA ribosome complex. D) Small subunit-mRNA-initiator tRNA complex. Show Answer Correct Answer: A) Polysome. 8. Select the correct number to complete:A codon consists of ..... nucleotides. A) Two. B) Three. C) Four. D) Five. Show Answer Correct Answer: B) Three. 9. The Hershey-Chase experiment determined that A) Protein and DNA are the hereditory materials of viruses. B) Protein, not DNA, is the hereditary material of viruses. C) Viruses do not contain hereditary material. D) DNA, not protein, is the hereditary material of viruses. Show Answer Correct Answer: D) DNA, not protein, is the hereditary material of viruses. 10. During transcription the DNA site at which the RNA polymerase binds is called as- A) Ori. B) Promoter. C) Shine Dalgarno Sequence. D) Enhancer. Show Answer Correct Answer: B) Promoter. 11. The process of splicing in eukaryotes involves: A) Removal of exons and joining of introns. B) Removal of introns and joining of exons. C) Addition of methyl cap to 5' end. D) Addition of poly-A tail to 3' end. Show Answer Correct Answer: B) Removal of introns and joining of exons. 12. Double-Helix A) A pair of parallel helices with opposite twists. B) A single helix with no twists. C) A pair of parallel helices intertwined about a common axis. D) A pair of parallel helices with no twists. Show Answer Correct Answer: C) A pair of parallel helices intertwined about a common axis. 13. Some amino acids are coded by more than one codon, hence the genetic code is: A) Unambiguous. B) Wobbled. C) Degenerate. D) Overlapping. Show Answer Correct Answer: C) Degenerate. 14. The enzyme DNA dependent RNA polymerase catalyzes the polymerization reaction in ..... direction. A) Both (a) and (b). B) Only 3' $\rightarrow$ 5'. C) None of these. D) Only 5' $\rightarrow$ 3'. Show Answer Correct Answer: D) Only 5' $\rightarrow$ 3'. 15. A + G = C + T is applicable to A) DsDNA. B) Rna. C) TRNA. D) All. Show Answer Correct Answer: A) DsDNA. 16. Unwinding of DNA is done by- A) Topoisomerase. B) Gyrase. C) Helicase. D) Ligase. Show Answer Correct Answer: C) Helicase. 17. Chargaff found that for DNA ..... A) The ratio of A to G is close to 1:1 and the ratio of T to C is close to 1:1. B) A + T = 50% of the total bases. C) A + T = G + C. D) The ratio of A to T is close to 1:1 and the ratio of G to C is close to 1:1. Show Answer Correct Answer: D) The ratio of A to T is close to 1:1 and the ratio of G to C is close to 1:1. 18. What is the main difference between monocistronic and polycistronic structural genes? A) Number of terminators. B) Number of promoters. C) Number of polypeptides encoded. D) Number of coding strands. Show Answer Correct Answer: C) Number of polypeptides encoded. 19. Select the correct term to complete:A sequence of three bases on tRNA is called ..... A) Anticodon. B) Codon. C) Promoter. D) Operator. Show Answer Correct Answer: A) Anticodon. 20. Which of the following provides some evidence that RNA probably evolved before DNA? A) RNA polymerase uses DNA as a template. B) DNA polymerase III does not require localized unwinding of the DNA. C) DNA polymerase III uses primer, usually made of RNA. D) RNA polymerase makes a single-stranded molecule. Show Answer Correct Answer: C) DNA polymerase III uses primer, usually made of RNA. 21. What is the backbone of DNA made of? A) Nitrogen bases. B) Amino acids. C) Double H. D) Sugar & PhosphateTagsDNA Structure. Show Answer Correct Answer: D) Sugar & PhosphateTagsDNA Structure. 22. The RNA copy that carries information from DNA in the nucleus into cytoplasm is ..... RNA. A) MRNA. B) Template. C) Anticodon. D) TRNA. Show Answer Correct Answer: A) MRNA. 23. State chargaff's rule A) Adenine=cytosine and guanine=thyamine. B) Adenine=thyamine and cytosine=guanine. C) Adenine=guanine and thyamine=cytosine. D) None of the above. Show Answer Correct Answer: B) Adenine=thyamine and cytosine=guanine. 24. One of the following is true with respect to AUG (a) b)(c)(d) A) It codes for methionine only (. B) It is also an initiation codon. C) It codes for methionine in both prokaryotes and eukaryotes. D) All of the above. Show Answer Correct Answer: D) All of the above. 25. Which of the following molecular characteristics cause histones to bind tightly to DNA? A) Histones are negatively charged, and DNA is positively charged. B) Histones are positively charged, and DNA is negatively charged. C) Both histones and DNA are strongly hydrophobic. D) Histones are covalently linked to the DNA. Show Answer Correct Answer: B) Histones are positively charged, and DNA is negatively charged. ← 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 4Class 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books