1688066
Description
Flashcards by paulinemansour, updated more than 1 year ago
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Created by paulinemansour
over 9 years ago
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| Question | Answer |
| In bacterial DNA replication of the lagging strand, __________ is required for the synthesis of a new DNA strand whereas __________ is required for removing the RNA primer and replacing it with DNA nucleotides. | DNA pol III; DNA pol I |
| Replication of the lagging strand of DNA is accomplished by repeatedly making __________ followed by 1,000–2,000 nucleotide segments called __________. | short RNA primers; Okazaki fragments |
| DNA polymerase adds nucleotides to the __________ of the leading strands, and to the __________ of the lagging strands (Okazaki fragments). | 3'; 3' |
| Of the three alternative models of DNA replication, which are the __________ models, the one that explains how DNA replicates is the __________ model. | conservative, semiconservative, and dispersive; semiconservative |
| When __________ form after an exposure to ultraviolet (UV) light, a __________ can remove the damaged nucleotides and replace them with normal nucleotides. | thymine dimmers; nucleotide excision repair enzyme |
| In DNA replication, the next nucleotide is incorporated into the growing polymer at the __________ of the molecule by an enzyme called __________. | 3' (hydroxyl) end; DNA polymerase |
| What is the 3' end and what is the 5' end. | 3' is hydroxyl, 5' is phosphate |
| In DNA, the two purines are __________, and the two pyrimidines are __________. | adenine and guanine; cytosine and thymine |
| What describes DNA replication? | Helicases seperate the 2 strands of double helix, then those strands are copied by the 2 original strands that are used as templates. |
| The role of DNA polymerases in DNA replication is to __________. | attach free nucleotides to the new DNA strand |
| Telomeres are __________. | repeating noncoding sequences at the end of linear eukaryotic chromosomes |
| NA replication begins at a site called the origin of replication, forming a bubble, which is followed by a __________, where parental strands are unwound by __________. | replication fork; helicases |
| A virus that infects bacteria is called a __________, which is made up of the macromolecules __________ and __________. | bacteriophage; DNA; protein |
| The information in DNA is contained in __________. | the sequence of nucleotides along the length of the two strands of the DNA molecule |
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