The enzyme responsible for proofreading a growing DNA strand and for replacing a
ID: 99776 • Letter: T
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The enzyme responsible for proofreading a growing DNA strand and for replacing a mismatched nucleotide is: A. Helicase B. Topioisomerase II C. DNA Ligase D. DNA Polymerase E. DNA Replicase A template strand of DNA has the sequence 5'-ATGGCTACG-3' A. 5' - TACCGATGC-3' B. 5'-UACCGAUGC-3' C. 3'-UACCGAUGC- 3' D. 3' - TACCGATGC-5' In DNA replication, each individual parent strand acts as a ____strand for the synthesis of a _____ strand A. Template: duplicate B. Template, daughter C. Duplicate: template D. Daughter, duplicate The fact that DNA replication occurs in virtually the same way in all organisms reflects A. Its origin early in the history of life B. Its multiple origins in different lineages of organisms C. The laws of thermodynamics D. The fact that mutations are generally harmful E. The universal genetic code The two strands of a double helix of DNA are linked by what kind of bond? A. Sugar-phosphate linkages B. Hydrogen bonds between bases C. Hydrogen bonds between sugars and phosphates D. Sugar-base linkages E. Base-phosphate linkages What are the products of the replication of one DNA molecule? A. Four identical double-stranded DNA molecules B. Two strands joined into one double-stranded DNA molecule C. Two identical double-stranded DNA molecules D. A set of four sister chromatids E. A pair of homologous chromosomes It was primarily the X-ray diffraction work on DNA by _____ that allowed for scientists to deduce the structure of DNA A. Louis Pasteur B. Gregor Mendel C. Rosalind Franklin D. T.H. MorganExplanation / Answer
29. DNA polymerases synthesize DNA molecules from deoxyribonucleotides which act as the building blocks of DNA. These enzymes perform DNA replication and usually work in pairs to create two identical DNA strands from a single original DNA molecule. During this process, DNA polymerase “reads” the existing DNA strands to create two matching new strands. So, D
30. As A=T and G=C, so 3'-TACCGATGC-5', D.
31. A. Template; duplicate.
32. The universal genetic code is a common language used by all organisms to transcribe nucleotide sequences of deoxyribonucleic acid (DNA) to ribonucleic acid (RNA) and then translate to amino acid sequences of proteins. So, E.
33. There are 2 types of bonds that held together DNA double helix- covalent bond within each linear strand and bonds the bases, sugars, and the phosphate groups and hydrogen bond between a base from one strand and a base from amother. So, B.
34. B. Two identical double stranded molecules as helicase unzips the DNA double helix.
35. C.Rosalind Franklin
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