This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 22 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Correct sequence for Alanine code: A) GCU, GCC, GCA. B) GAU, GAC, GAA. C) AGU, AGC, AGA. D) GUU, GUC, GUA. Show Answer Correct Answer: A) GCU, GCC, GCA. 2. The experimental proof for semiconservative replication of DNA was first shown in a- A) Fungus. B) Bacterium. C) Plant. D) Virus. Show Answer Correct Answer: B) Bacterium. 3. DNA as an acidic substance present in nucleus was first identified by whom in 1869Hint:He named it Nuclein A) Watson and Crick. B) Wilkins and Franklin. C) Friedrich Meischer. D) Erwin Chargaff. Show Answer Correct Answer: C) Friedrich Meischer. 4. Transition type of mutation is caused when- A) GC is replaced by TA. B) AT Replaced by CG. C) CG is replaced by GC. D) AT is replaced by GC. Show Answer Correct Answer: D) AT is replaced by GC. 5. HGP methology which includes identification of all the genes that express as RNA is referred as A) RFLP. B) ESTs. C) VNTR. D) RAPD's. Show Answer Correct Answer: B) ESTs. 6. The structure of DNA includes its double helix and nucleotide components. A) A. Single helix and amino acids. B) B. Double helix and nucleotide components. C) All the above. D) None of the above. Show Answer Correct Answer: B) B. Double helix and nucleotide components. 7. Which of the following statements concerning the regulator gene (R) associated with the lac operon is correct? A) MRNA is transcribed from the R gene whether lactose is present or not. B) MRNA is transcribed from the R gene only when lactose is present. C) MRNA is transcribed from the R gene only when lactose is not present. D) Lactose inhibits the translation of R gene to mRNA. Show Answer Correct Answer: A) MRNA is transcribed from the R gene whether lactose is present or not. 8. What bonds are present in DNA A) Glycosidic. B) Ester. C) Hydrogen. D) All. Show Answer Correct Answer: D) All. 9. Which one of the following condition can cause pneumonia in mice? A) Injection of R strain into mice. B) Injection of heat killed R strain into mice along with heat killed S strain. C) Injection of heat killed S strain into mice. D) Injection of live S strain into mice or heat killed S strain along with live R strain. Show Answer Correct Answer: D) Injection of live S strain into mice or heat killed S strain along with live R strain. 10. Central dogma of protein synthesis is A) DNA $\rightarrow$ RNA $\rightarrow$ Protein. B) DNA $\rightarrow$ DNA $\rightarrow$ Protein. C) RNA $\rightarrow$ DNA $\rightarrow$ Protein. D) DNA $\rightarrow$ protein $\rightarrow$ RNA. Show Answer Correct Answer: A) DNA $\rightarrow$ RNA $\rightarrow$ Protein. 11. Which molecule has its synthesis directly controlled by DNA? A) Amylase. B) Cholesterol. C) Glycogen. D) Phospholipid. Show Answer Correct Answer: A) Amylase. 12. Regulatory genes A) Code for the protein. B) Code for RNA. C) They affect the inheritance along with promoter. D) None of the above. Show Answer Correct Answer: C) They affect the inheritance along with promoter. 13. Which scientist(s) mixed a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form? A) Griffith. B) Watson & Crick. C) Meselson & Stahl. D) Chargaff. Show Answer Correct Answer: A) Griffith. 14. Antiparallel strands of a DNA molecule means that: A) One strand turns anti-clockwise. B) The phosphate groups of two DNA strands, at their ends, share the same position. C) The phosphate groups at the start of two DNA strands are in opposite position (pole). D) One strand turns clockwise. Show Answer Correct Answer: C) The phosphate groups at the start of two DNA strands are in opposite position (pole). 15. Beside protein enzymes certain biochemical reactions are catalysed by A) RNA. B) DNA. C) Carbohydrate. D) None of the above. Show Answer Correct Answer: A) RNA. 16. Enzyme that connects the DNA to the backbone (glues) A) Ligase. B) Polymerase. C) Helicase. D) PrimaseTagsDNA replication enzymes. Show Answer Correct Answer: A) Ligase. 17. DNA profiling is also known as DNA ..... A) Electrophoresis. B) Fingerprinting. C) Extraction. D) Replication. Show Answer Correct Answer: B) Fingerprinting. 18. Transcription unit: A) Starts with CAAT region. B) Starts with promoter region and ends in terminator region. C) Starts with palindromic regions and ends with rho factor. D) Starts with TATA box. Show Answer Correct Answer: B) Starts with promoter region and ends in terminator region. 19. In his work with pneumonia-causing bacteria and mice, Griffith found that ..... A) The protein coat from pathogenic cells was able to transform nonpathogenic cells. B) Heat-killed pathogenic cells caused pneumonia. C) Some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic. D) The polysaccharide coat of bacteria caused pneumonia. Show Answer Correct Answer: C) Some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic. 20. The human genome project started in ..... and completed, in ..... year respectively. A) 1990, 2003. B) 1993, 2003. C) 1993. 2006. D) 1991. 2006. Show Answer Correct Answer: A) 1990, 2003. 21. DNA sequences that code for protein are known as A) Intron. B) Exon. C) Control Regions. D) Intervening Sequences. Show Answer Correct Answer: B) Exon. 22. If the sequence of initrogen bases of the coding strand of DNA in a transcription unit is:5'-ATGAATG-3', the sequence of bases in its RNA transcript would be A) 5'-AUG A AUG-3'. B) 5'-UACUU AC-3'. C) 5'-CAUUCAU-3'. D) 5'-GUAAGUA-3'. Show Answer Correct Answer: D) 5'-GUAAGUA-3'. 23. Mutations are A) Heritable changes in the sequence of DNA bases that produce an observable phenotype. B) Heritable changes in the sequence of DNA bases. C) Mistakes in the incorporation of amino acids into proteins. D) Heritable changes in the mRNA of an organism. Show Answer Correct Answer: B) Heritable changes in the sequence of DNA bases. 24. Because most of the amino acids are represented by ore than one codon the genetic code is- A) Overlapping. B) Wobbling. C) Ambiguos. D) Degenerate. Show Answer Correct Answer: D) Degenerate. 25. Frederick Sanger is credited for the invention of A) DNA sequencing method. B) Protein sequencing method. C) Both of the above. D) Only the first. Show Answer Correct Answer: C) Both of the above. ← 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