This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 31 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which one of the following makes use of RNA asa template to synthesize DNA- A) DNA dependant RNA polymerase. B) DNA polymerase. C) Reverse transcriptase. D) RNA polymerase. Show Answer Correct Answer: C) Reverse transcriptase. 2. In microbial genetics which one is referred to as 'Griffith effect'? A) Conjugation. B) Transduction. C) Transformation. D) Transcription. Show Answer Correct Answer: C) Transformation. 3. On the lagging strand in replication, the Okazaki fragments must be joined by which enzyme? A) DNA polymerase. B) Primase. C) Ligase. D) Helicase. Show Answer Correct Answer: C) Ligase. 4. Select the incorrect statement among the following. A) The plane of one base pair stacks over the other in a double helix of DNA. B) The pitch of the DNA double helix is 3.4 nm. C) H-bonds confer additional stability to the double stranded DNA structure. D) Two nucleotides are linked through H-bonds to form a dinucleotide. Show Answer Correct Answer: D) Two nucleotides are linked through H-bonds to form a dinucleotide. 5. Although there are a limited number of amino acids, many different types of proteins exist because the ..... A) Size of a given amino acid can vary. B) Chemical composition of a given amino acid can vary. C) Sequence and number of amino acids is different. D) Same amino acid can have many different properties. Show Answer Correct Answer: C) Sequence and number of amino acids is different. 6. The genetic material of $\Phi$ A) SsDNA. B) SsRNA. C) DsDNA. D) DsRNA. Show Answer Correct Answer: A) SsDNA. 7. The RNA polymerase holocnzyme transcribes A) The promoter, structural gene and the terminator region. B) The promoter and the terminator region. C) The structural gene and the terminator region. D) The structural gene only. Show Answer Correct Answer: B) The promoter and the terminator region. 8. Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A? A) Rosalind Franklin. B) Maurice Wilkins. C) Erwin Chargaff. D) Meselson and Stahl. Show Answer Correct Answer: B) Maurice Wilkins. 9. Select the correct role to complete:AUG codes for methionine and serves as ..... codon. A) Start. B) Stop. C) Nonsense. D) Overlapping. Show Answer Correct Answer: A) Start. 10. In what phase of the cell cycle does DNA replication take place? A) G1. B) S. C) G2. D) M. Show Answer Correct Answer: B) S. 11. Meselson and Stahl experiment proved A) DNA is genetic material. B) Central Dogma. C) Transformation. D) Semi Conservative DNA replication. Show Answer Correct Answer: D) Semi Conservative DNA replication. 12. Okazaki fragments are seen during A) Transcription. B) Translation. C) Replication. D) Transduction. Show Answer Correct Answer: C) Replication. 13. In a DNA stand the nucleotide are linked together by A) Glycosidic bonds. B) Phophodiester bonds. C) Peptide bonds. D) Hydrogen bonds. Show Answer Correct Answer: B) Phophodiester bonds. 14. Which enzyme is responsible for adding nucleotides to the free three prime end A) Helicase. B) Topoisomerase. C) DNA Polymersase 3. D) DNA Polymersase 1TagsDNA replication enzymes. Show Answer Correct Answer: C) DNA Polymersase 3. 15. Adenine forms ..... hydrogen bonds with Thymine from opposite strand and vice-versa. Similarly, Guanine is bonded with Cytosine with ..... H-bonds. A) Two, two. B) Three, three. C) Two, three. D) Three, two. Show Answer Correct Answer: C) Two, three. 16. Nucleotide arrangement in DNA can be seen by A) X-ray crystallography. B) Electron microscope. C) Ultra centrifuge. D) Transcriptase. Show Answer Correct Answer: A) X-ray crystallography. 17. Who discovered the process of transformation and on which species was it done? A) Frederich Miescher, Streptococcus pneumoniae. B) Frederick Griffith, Streptococcus pneumoniae. C) Alfred Hershey, T2 Bacteriophage. D) Martha Chase, T2 bacteriophage. Show Answer Correct Answer: B) Frederick Griffith, Streptococcus pneumoniae. 18. ERF1 is the release factor in eukaryotes that requires A) ATP for its binding to ribosome. B) GTP for its binding to ribosomes. C) ATP and GTP for its binding to ribosome. D) Mn for its binding to ribosomes. Show Answer Correct Answer: B) GTP for its binding to ribosomes. 19. What is the role of DNA ligase in the elongation of the lagging strand during DNA replication? A) It unwinds the parental double helix. B) It synthesizes RNA nucleotides to make a primer. C) It joins Okazaki fragments together. D) It stabilizes the unwound parental DNA. Show Answer Correct Answer: C) It joins Okazaki fragments together. 20. What is the role of histones in DNA packaging in eukaryotes? A) Provide energy for replication. B) Repair damaged DNA. C) Act as DNA polymerases. D) Wrap DNA around to form nucleosomes. Show Answer Correct Answer: B) Repair damaged DNA. 21. RNA and DNA are similar in terms that both A) Are double stranded. B) Have similar sugars. C) Have similar pyrimidines. D) Are polymers of nucleotides. Show Answer Correct Answer: D) Are polymers of nucleotides. 22. Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight, and mutations to the DNA in their skin cells are left uncorrected. Why are the mutations not corrected in individuals with this disorder? A) The disorder causes cells to be unable to repair thymine dimers. B) The disorder makes cells unable to replicate DNA. C) The disorder makes cells unable to form chromosomes. D) The disorder causes mitosis to stop during metaphase. Show Answer Correct Answer: A) The disorder causes cells to be unable to repair thymine dimers. 23. Select the correct expansion to complete:UTR stands for ..... A) Untranslated Region. B) Universal Transfer RNA. C) Upstream Regulatory element. D) Unique Tandem Repeat. Show Answer Correct Answer: A) Untranslated Region. 24. Why is it that DNA replication is so much more difficult in the lagging strand compared to the leading strand? A) The leading strand replicates in the 5' to 3' direction away the replication fork. B) The lagging strand replicates in the 5' to 3' away from the replication fork. C) The leading strand has special enzymes that make the process more efficient. D) The lagging strand is parallel to the leading strand. Show Answer Correct Answer: B) The lagging strand replicates in the 5' to 3' away from the replication fork. 25. Which one of the following is the start codon? A) AUG. B) UAA. C) UAG. D) UGA. Show Answer Correct Answer: A) AUG. ← 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