This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Nucleosome core contains A) 100 bp DNA. B) 146 bp DNA. C) 300 bp DNA. D) 50 bp DNA. Show Answer Correct Answer: B) 146 bp DNA. 2. Double-stranded DNA looks a little like a ladder that has been twisted into a helix or spiral. The side supports of the ladder are A) Individual nitrogenous bases. B) Alternating bases and sugars. C) Alternating bases and phosphate groups. D) Alternating sugars and phosphates. Show Answer Correct Answer: B) Alternating bases and sugars. 3. Euchromatin A) Highly condensed and is visible as irregular clumps. B) Less compacted and more dispersed. C) All the above. D) None of the above. Show Answer Correct Answer: B) Less compacted and more dispersed. 4. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called A) A-DNA. B) B-DNA. C) CDNA. D) RDNA. Show Answer Correct Answer: C) CDNA. 5. In eukaryotes, RNA polymerase III catalyses the synthesis of A) 5 S rRNA, tRNA & SnRNA. B) MRNA, HnRNA & SnRNA. C) 28 S rRNA, 18 S rRNA & 5 S rRNA. D) All types of rRNA & tRNA. Show Answer Correct Answer: A) 5 S rRNA, tRNA & SnRNA. 6. DNA is made up of A) Deoxyribonucleotide. B) Ribonucleotide. C) Nucleotide. D) Nucleoside. Show Answer Correct Answer: A) Deoxyribonucleotide. 7. Which of the following hydrolyses internalphosphodiester bonds in a polynucleotidechain A) Lipase. B) Protease. C) Exonuclease. D) Endonuclease. Show Answer Correct Answer: D) Endonuclease. 8. The enzyme that joins Okazaki fragments during DNA replication is: A) DNA polymerase. B) DNA helicase. C) DNA ligase. D) DNA primase. Show Answer Correct Answer: C) DNA ligase. 9. During biochemical characterization of transforming principle, the digestion with ..... did inhibit transformation suggesting that DNA caused the transformation. A) DNAase. B) Protease. C) RNAase. D) DNA polymerase. Show Answer Correct Answer: A) DNAase. 10. Which of the following base pairs would never be found in the cell? A) Adenine $\rightarrow$ thymine. B) Cytosine $\rightarrow$ guanine. C) Thymine$\rightarrow$ uracil. D) Adenine $\rightarrow$ uracil. Show Answer Correct Answer: C) Thymine$\rightarrow$ uracil. 11. Precursor of m-RNA is A) Sn rna. B) T rna. C) M rna. D) Hn rna. Show Answer Correct Answer: D) Hn rna. 12. In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules? A) A + G = C + T. B) A = G. C) A = C. D) A + T = G + C. Show Answer Correct Answer: A) A + G = C + T. 13. The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following? A) The same codons in different organisms translate into the different amino acids. B) A gene from an organism can theoretically be expressed by any other organism. C) All organisms have experienced convergent evolution. D) DNA was the first genetic material. Show Answer Correct Answer: B) A gene from an organism can theoretically be expressed by any other organism. 14. In eukaryotic transcription, RNA polymerase II is responsible for transcribing: A) RRNA genes. B) TRNA genes. C) MRNA precursor (hnRNA). D) All types of RNA. Show Answer Correct Answer: C) MRNA precursor (hnRNA). 15. In the "beads on a string" structure of unfolded chromatin, the "beads" are ..... A) Genes. B) Nucleosomes. C) Nucleoids. D) Heterochromatin. Show Answer Correct Answer: B) Nucleosomes. 16. Transcription occurs in the ..... A) Nucleus. B) Cytoplasm. C) Ribosomes. D) Kitchen. Show Answer Correct Answer: A) Nucleus. 17. Assertion (A):The anticodon loop of the tRNA contains bases that are complementary to the codes. Reason(R):The stop codons are UAA, UAG and UGA A) Both assertion and reason are true and the reason is the correct explanation of assertion. B) Both assertion and reason are true but the reason is not the correct explanation of assertion. C) Assertion is true but reason is false. D) Both assertion and reason are false. Show Answer Correct Answer: B) Both assertion and reason are true but the reason is not the correct explanation of assertion. 18. Length of DNA will be ..... , if it consists of 10, 000 base pairs. A) 3400 nm. B) 340 nm. C) 34000 nm. D) 0.034 nm. Show Answer Correct Answer: A) 3400 nm. 19. Who discovered presence of DNA in the nucleus for the first time? What name was given to it by him? A) Friedrich Meisher; nucleic acid. B) Friedrich Meisher; nuclein. C) Francis Crick, nucleic acid. D) Francis Crick, nuclein. Show Answer Correct Answer: B) Friedrich Meisher; nuclein. 20. The sequence of structural gene in lac operon is A) Lac A, Lac Y, Lac Z. B) Lac A, Lac Z, Lac Y. C) Lac Y, Lac Z, Lac A. D) Lac Z, Lac Y, Lac A. Show Answer Correct Answer: D) Lac Z, Lac Y, Lac A. 21. Name the polarity of the strand which is used as a template for transcription A) 5'-3'. B) 3'-5'. C) Both. D) None. Show Answer Correct Answer: B) 3'-5'. 22. During transcription of a eukaryotic cell, what determines the template strand? A) The location of the AUG start codon. B) The base sequence of the enhancer. C) The base sequence of the operator. D) The base sequence of the promoter. Show Answer Correct Answer: D) The base sequence of the promoter. 23. Telomeres A) Telomeres are found in the cytoplasm. B) Telomeres are responsible for protein synthesis. C) Telomeres are repetitive DNA sequences at the end of chromosomes. D) None of the above. Show Answer Correct Answer: C) Telomeres are repetitive DNA sequences at the end of chromosomes. 24. To prove that DNA is the genetic material, which radioactive isotopes were used by Hershey and Chase (1952) in experiments? A) 33S and 15N. B) 32P and 35S. C) 32P and 15N. D) 14N and 15N. Show Answer Correct Answer: D) 14N and 15N. 25. The genetic code is A) Triplet. B) Doublet. C) Singlet. D) Quartet. Show Answer Correct Answer: A) Triplet. ← 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 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