42) Evidence for the spiral nature of DNA came from A) base rule studies C) stud
ID: 202641 • Letter: 4
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42) Evidence for the spiral nature of DNA came from A) base rule studies C) studies of disease-causing bacteria 42) B) X-ray crystallography stadies bacterlophage studies 43) What type of chemical bond joins the bases of complementary DNIA A) covalent DNA strands? 43) B) hydrogen C) ionic D) hydrophilic 44) What type of chemical bond joins the sugar phosphate backbone of a DNA 44) strand? A) covalent B) hydrogen C) hydrophilic D) ionic 45) After replication, 45) A) one new DNA double helix consists of two old strands and the other new DNA double helis consists of two new strands B) each new DNA double helix consists of two new strands Qeach new DNA double helix consists of one old strand and one new strand D) each new DNA double helix consists of two old strands 46) 46) What name is given to the collection of traits exhibited by an organism? C) genome B) genetic code A) phenotype 47) 47) How many amino acids are common to all living systems? C) 100 D) 10 20 B) 30 D) two 48) How many nucleotides make up a codon? C) four B) three A) five 49) The sharedgenetic code of all lite on Earth is evidence that (A) all life shares a common ancestry B) DNA replication is error-free C) bacterial cells arose earlier than eukaryotic cells ) the genetic code arose relatively late in the history of life on Earth 50) A) manufacture of two new DNA double helices that are identical to an old DNA double helix B) modification of a strand of RNA prior to the manufacture of a protein C) manufacture of a protein based on information carried by RNA D) manufacture of a strand of RNA complementary to a strand of DNA 50) Transcription is the_ 51) . If a strand of DNA has the sequence AACCTCtranscription will result in a(n) A) single RNA strand with the sequence TTCGAG B) DNA double helix with the sequence AAGCTC for one strand and TTCGAG for the complementary strand Q) RNA double helix with the sequence UUCGAG for one strand and AACCUC for the complimentary strand D) single RNA strand with the sequence UUCGAG 52) B) reverse transcriptase D) RNA polymerase 52) Which of the following enzymes is responsible for RNA synthesis? A) DNA polymerase C) ribosomeExplanation / Answer
42. X-Ray crystallography states the helical structure of DNA.
43. A and T are joined with 2 and G and C are joined by H bonds.
44. Sugar and phosphate are joined by covalent bond between sugar oxygen and phosphate of phosphoric acid.
45. New synthesized DNA has one parental and one new strand called semi-conservative replication.
46. Phenotype is expressed form of DNA.
47. 20 amino acid are involved in protein structure.
48. Codon is triplet.Option B is correct.
49. Universality of genetic code evidences the common ancestry.
50. RNA is synthesized in transcription.
51. RNAsynthesized is complimentary to templete strand of DNA.
52. RNA polymerase is enzyme in transcription.
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