This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 20 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A nucleoside is A) A nucleotide without sugar. B) A nucleotide without phosphate. C) A nucleotide without nitrogenous bases. D) A nucleotide without sugar only. Show Answer Correct Answer: B) A nucleotide without phosphate. 2. Who gave the experimental proof for semiconservative mode of replication A) Messolson & Stahl. B) Hershey & Chase. C) Watson & Crick. D) Griffith. Show Answer Correct Answer: A) Messolson & Stahl. 3. Why is DNA polar A) It has two charges. B) It has two open ends. C) It has 3rd carbon free at one end and 5th carbon free at other end in sugar. D) It has 3rd carbon free at one end and 5th carbon free at other end in nitrogen base pair. Show Answer Correct Answer: C) It has 3rd carbon free at one end and 5th carbon free at other end in sugar. 4. A segment of DNA has 120 adenine and 120 cytosine bases.The total number of nucleotides present in the segment is ..... A) 60. B) 120. C) 240. D) 480. Show Answer Correct Answer: D) 480. 5. The electric charge on DNA and histones is A) Both positive. B) Both negative. C) Zero. D) Negative and positive respectively. Show Answer Correct Answer: D) Negative and positive respectively. 6. During replication of a bacterial chromosome DNAsynthesis starts from a replication origin site and A) RNA primers are not involved. B) Is facilitated by telomerase. C) Moves in one direction of the site. D) Moves in bi-directional way. Show Answer Correct Answer: D) Moves in bi-directional way. 7. Identify the correct order of organisation of genetic material from largest to smallest A) Genome, chromosome, gene, nucleotide. B) Chromosome, genome, nucleotide, gene. C) Chromosome, gene, genome, nucleotide. D) Genome, chromosome, nucleotide, gene. Show Answer Correct Answer: A) Genome, chromosome, gene, nucleotide. 8. Why is only one DNA strand transcribed for a given gene? A) Transcribing both strands would produce identical RNAs and waste energy. B) RNA polymerase can bind only the lagging strand. C) Promoter orientation specifies a single template strand, preventing conflicting transcripts. D) Only one strand contains bases. Show Answer Correct Answer: C) Promoter orientation specifies a single template strand, preventing conflicting transcripts. 9. Shine Dalgarno sequence is located six to ten bases upstream of the initiation codon of mRNA. It consists of A) Purine-rich nucleotide sequence. B) Pyrimidine rich nucleotide sequence. C) Uracil-containing nucleotide sequence. D) None of the above. Show Answer Correct Answer: A) Purine-rich nucleotide sequence. 10. What will be the sequence of mRNA produced by the following stretch of DNA? 3' ATGCATGCATGCATG 5' TEMPLATE STRAND 5' TACGTACGTACGTAC 3' CODING STRAND A) 3' AUGCAUGCAUGCAUG 3'. B) 3' AUGCAUGCAUGCAUG 5'. C) 5' UACGUACGUACGUAC 3'. D) 3' UACGUACGUACGUAC 5'. Show Answer Correct Answer: C) 5' UACGUACGUACGUAC 3'. 11. In DNA strand, the nucleotides are linked together by A) Glycosidic bonds. B) Phosphodiester bonds. C) Peptide bonds. D) Hydrogen bonds. Show Answer Correct Answer: B) Phosphodiester bonds. 12. The structures in chromatin seen as 'beads-on string' when viewed under electron microscope are called: A) Nucleotides. B) Nucleosides. C) Histone octamers. D) Nucleosomes. Show Answer Correct Answer: D) Nucleosomes. 13. Which RNA carries the amino acids from the amino acid pool to mRnA during protein synthesis? A) RRNA. B) MRNA. C) /RNA. D) HnRNA. Show Answer Correct Answer: C) /RNA. 14. This enzyme synthesizes short RNA sequences to guide DNA Polymerase A) Primers. B) DNA Primase. C) DNA Polymerase. D) TopoisomeraseTagsDNA replication enzymes. Show Answer Correct Answer: B) DNA Primase. 15. F. Griffith conducted the experiment with bacteriophages A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 16. DNA synthesis takes place during A) S phase. B) G1 phase. C) G2 phase. D) M phase. Show Answer Correct Answer: A) S phase. 17. When scientists say that DNA transmits information, they mean that it passes information from one generation to the next. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 18. Molecules which play the key role in the transfer of genetic information during protein synthesis are ..... A) DNA. B) Nucleic acid. C) Lipids. D) RNA. Show Answer Correct Answer: D) RNA. 19. Histone H1 is associated with A) Core particle. B) Linker DNA. C) Ribosome. D) MRNA. Show Answer Correct Answer: B) Linker DNA. 20. Name the stage in the cell cycle where DNA replication occurs . A) G1-phase. B) M-phase. C) S-phase. D) G2-phase. Show Answer Correct Answer: C) S-phase. 21. What are the subunits of DNA and what is their function? A) Nucleotides that store information. B) Monosaccharides that provide quick energy for the cell. C) Lipids that store energy and provide insulation. D) Proteins that provide the building blocks for the structural components of organisms. Show Answer Correct Answer: A) Nucleotides that store information. 22. The two strands of a DNA double helix are antiparallel. This means that ..... A) They both run in the 3' to 5' direction. B) The two strands are mirror images. C) One strand runs in the 5' to 3' direction, and the other runs in the 3' to 5' direction. D) One strand is actually composed of RNA. Show Answer Correct Answer: C) One strand runs in the 5' to 3' direction, and the other runs in the 3' to 5' direction. 23. Which of the following are the functions of RNA? A) It is a carrier of genetic information from DNA to ribosomes synthesizing polypeptides. B) It carries amino acids to ribosomes. C) It is a constituent component of ribosomes. D) All of the above. Show Answer Correct Answer: D) All of the above. 24. How introns are removed in eukaryotic cells A) Silencing. B) Capping. C) Tailing. D) Splicing. Show Answer Correct Answer: D) Splicing. 25. Select the correct component to complete:Spliceosome contains proteins and ..... A) SnRNA. B) MRNA. C) TRNA. D) RRNA. Show Answer Correct Answer: A) SnRNA. ← 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