CH-20 Chromosomes & DNA Leave a Comment / By abdulslambsn@gmail.com / October 6, 2025 Welcome To Your Quiz "CH-20 Chromosomes & DNA" Click on "Start Quiz" To Continue... 1. The number of chromosomes in some ferns is: 32 500 400 0 None 2. The chromosome in which centromere is present near the center of chromatids is: Acrocentric Telocentric Sub metacentric Metacentric None 3. The amount of DNA in chromosomes is: 20% 40% 60% 80% None 4. A typical commerce firm contains nucleotide about: 100 million 120 million 140 million 160 million None 5. Number of histone protein molecules in single nucleosomes are: 6 8 9 10 None 6. ''The central role of chromosome in heredity'' was suggested by: Walter Sutton Walther Fleming Mendel Karl Correns None 7. Transforming principle was formulated by: Oswald Avery Fred Griffith Karl Correns walther Sutton None 8. Basic structure of nuclei acid was determined by: P.A. Levene Walther Fleming F. Miescher Watson and Crick None 9. The diameter of DNA molecule is: 2 nm 3 nm 4 nm None 10. Number of hydrogen bonds formed between Guanine and Cytosine are: 1 2 3 4 None 11. The model of DNA replication in which one strand is convserved and other is synthesized is: Conservative Semi- conservative Dispersive None of the above None 12. The enzyme which attaches the fragments of DNA is: DNA polymerase I Primase Ligase DNA polymerase II None 13. The DNA polymerase adds how many nucleotides to the end? 2 3 4 5 None 14. The length of Okazaki fragments is: 100 - 200 nucleotide 200 - 300 nucleotide 300 - 400 nucleotide 400 - 500 nucleotide None 15. Match homogenetisic acid with one of the following: Hemophilia Anemia Alkaptonuria Tay Sach's disease None 16. Minimal minimal medium was prepared by: Beadle and Tatum Meselson - Stahl Garrod and Bateson Watson and Crick None 17. Sickle cell anemia is caused due to the change of glutamic acid to: Histidine Leucine Valine Proline None 18. The synthesis of protein is called: Replication Transcription Translation None of the above None 19. mRNA is synthesized by: RNA Polymerase I RNA Polymerase II RNA polmerase III None of the above None 20. Which of the followings is a stop signal for transcription? CA GA GC TA None 21. Total number of genetic codes is: 43 60 64 68 None 22. Genetic code for phenylalanine is: CCC UUU AAA GGG None 23. Which of the followings helps the tRNA to attach on exposed mRNA code at, A site: tRNA synthase Initiation factor Elongation factor Termination factor None 24. If the DNA of an human adult is lined up end to end, it will stretch nearly: 50 billion km 100 billion km 200 billion km 300 billion km None 25. The change of chromosomal number is: Delection Point mutation Insertion Aberration None 26. The objection on chromosomal theory of inheritance was: There are more chromosomes but less gene There are more gene but less chromosomes Each chromosome carry only one gene None of the above None 27. The opposite strand is called a coding strand or sense strand in transcription because: It has opposite chords of template strand It has similar codes as of template strand Its codes are similar to mRNA codes It's codes are opposite to mRNA codes None 28. The centromeric position divides the chromosome into how many type? 2 6 4 3 None 29. Sequence of specific nucleotide that result specific proteins is called: Nucleoside Gene Chromosomes Nucleotides None 30. In 1956 Vernon Ingram discovered molecular basis of: All Phenylketonuria Sickle cell anemia Ccancer None 31. DNA was first discovered in 1869 by: P.A. Levene Watson and Crick F. Miescher Franklind None 32. Chromosomes consist of DNA and protein in: 60% - 30% 20% -80% 40% - 60% 90% - 10% None 33. Waston and Crick: Locus DNA polymerase DNA model Meselon and Stahl None 34. M.Meselson: DNA replication Nucleotide Prokaryotes 2 nm None 35. P-site: Peptidyl site 1000 nucleotides/sec ACC Chromosomal aberration None 36. GCC: Proline Alanine Anticodon Stop codon None 37. Transcription bubble: Uribonucleotide Core enzyme Sigma factor GC + AT base pairs None 38. Stop signal: GC + AT base pairs 3' end U ribonucleotide Core enzyme None 39. TATAAT: tRNA Promotor sequence mRNA Human cell None 40. Coding strand: tRNA mRNA Human cell Sense strand None 1 out of 8 Thanks For Taking This Quiz - Please See Your Answers/Results Below After Entering Your Name & Email... Name Email Time's up
