This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 43 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 43 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which enzyme is responsible for joining the discontinuously synthesized fragments during DNA replication? A) DNA polymerase. B) DNA ligase. C) Primase. D) Helicase. Show Answer Correct Answer: B) DNA ligase. 2. Genetic code translates the language of A) RNA into that of protein. B) RNA into that of DNA. C) Amino acids into that of RNA. D) Protein into that of DNA. Show Answer Correct Answer: A) RNA into that of protein. 3. Spliceosomes are not found in cells of; A) Fungi. B) Animals. C) Bacteria. D) Plants. Show Answer Correct Answer: C) Bacteria. 4. By which method does the DNA replicate? A) Conservative. B) Semi conservative. C) Dispersive. D) None of the above. Show Answer Correct Answer: B) Semi conservative. 5. The net electric charge on DNA and histone is A) Both positive. B) Both negative. C) Both 1 and 2. D) Zero. Show Answer Correct Answer: C) Both 1 and 2. 6. Which of the following represents a bond between a purine and a pyrimidine (in that order)? A) C-T. B) G-A. C) G-C. D) T-A. Show Answer Correct Answer: C) G-C. 7. During DNA replication, which enzyme primarily adds nucleotides to the growing DNA strand in the 5'$\rightarrow$3' direction? A) DNA polymerase. B) RNA polymerase. C) Helicase. D) Ligase. Show Answer Correct Answer: A) DNA polymerase. 8. Which enzyme is responsible for forming phosphodiester bonds between the Okazaki fragments? A) Ligase. B) Helicase. C) DNA Polymerase 1. D) DNA Polymerase 3TagsDNA replication enzymes. Show Answer Correct Answer: A) Ligase. 9. Histone proteins are A) Basic, positively charged. B) Basic, negatively charged. C) Acidic, positively charged. D) Acidic, negatively charged. Show Answer Correct Answer: A) Basic, positively charged. 10. Read the following four statements (A-D):(A) In transcription, adenosine pairs with uracil.(B) Regulation of lac operon by repressor is referred to as positive regulation.(C) The human genome has approximately 50, 000 genes.(D) Haemophilia is a sex-linked recessive disease.How many of the above statements are right? A) Two. B) Three. C) Four. D) One. Show Answer Correct Answer: A) Two. 11. A scientist observes a base sequence of AGCTAGCTAGCT. Which of the following would be the complimentary strand? A) TGCATGCATGCA. B) TCGATCGATCGA. C) TAGCTAGCTAGC. D) TTAAGGCCTTCC. Show Answer Correct Answer: B) TCGATCGATCGA. 12. Thymine makes up 28% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be guanine? A) 8%. B) 72%. C) 16%. D) 22%. Show Answer Correct Answer: D) 22%. 13. Process of copying DNA A) Transcription. B) Translation. C) Replication. D) Inversion. Show Answer Correct Answer: C) Replication. 14. How many amino acids are coded for by this sequence of nucleotides? ATGGGAACTCCA A) 4. B) 2. C) 6. D) 12. Show Answer Correct Answer: A) 4. 15. The fully processed hnRNA is known as A) TRNA. B) SnRNA. C) MRNA. D) ScRNA. Show Answer Correct Answer: C) MRNA. 16. In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number of cytosine bases? A) 780. B) 1560. C) 740. D) 1480. Show Answer Correct Answer: A) 780. 17. Select the correct term to complete:The coding sequence of mRNA is known as ..... A) Reading frame. B) Leader sequence. C) Poly-A tail. D) Shine-Dalgarno sequence. Show Answer Correct Answer: A) Reading frame. 18. What is 5 methyl uracil A) Uracil. B) Thymine. C) Adenine. D) Methylated adenine. Show Answer Correct Answer: B) Thymine. 19. What is anti parallel nature of DNA A) Both strand run in 5 direction. B) Both strand run In 3 direction. C) One strand runs in 5 and other runs in 3 direction. D) All of these. Show Answer Correct Answer: C) One strand runs in 5 and other runs in 3 direction. 20. If a cell were unable to produce histone proteins, which of the following results would be a likely effect on the cell? A) The cell's DNA could not be packed into its nucleus. B) There would be an increase in the amount of DNA produced during replication. C) Spindle fibers would not form during prophase. D) Amplification of other genes would compensate for the lack of histones. Show Answer Correct Answer: A) The cell's DNA could not be packed into its nucleus. 21. What can be observed if both the strands are copied simultaneously during transcription? A) The segment of DNA would be coding for 2 different proteins. B) 2 RNA will be produced simulataneously, complementary to each other. C) Formation of double helical RNA. D) All of the bove. Show Answer Correct Answer: D) All of the bove. 22. What is the difference between euchromatin and heterochromatin? A) Euchromatin is inactive, heterochromatin is active. B) Euchromatin is transcriptionally active, heterochromatin is inactive. C) Euchromatin is tightly packed, heterochromatin is loosely packed. D) Euchromatin is found in prokaryotes, heterochromatin in eukaryotes. Show Answer Correct Answer: B) Euchromatin is transcriptionally active, heterochromatin is inactive. 23. Heterogeneous RNA (hnRNA) A) Can get directly involved in translation in all organisms. B) Contains exons and but lacks introns. C) Does not require processing to become active for translation. D) Is precursor of messenger RNA in eukaryotes. Show Answer Correct Answer: D) Is precursor of messenger RNA in eukaryotes. 24. If Erwin Chargaff finds that 36% of a particular frog's DNA bases are thymine, then what percent of the DNA bases are either cytosine or adenine? A) 36%. B) 28%. C) 72%. D) 50%. Show Answer Correct Answer: D) 50%. 25. Taylor conducted the experiments to prove semi-conservative mode of chromosome replication on A) Vinca rosea. B) Vicia faba. C) Drosophila melanogaster. D) E. coli. Show Answer Correct Answer: B) Vicia faba. ← 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