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Nucleic Acid set 2
Nucleic Acid Module set 2
| Question | Answer |
|---|---|
| DNA replication is | semiconservative |
| DNA double helix denatures (strands separate),Each strand serves as the template for the synthesis of new second strand,and DNA polymerase adds complementary nucleotides in | DNA replication |
| The nucleotide comes in as a | triphosphate |
| bidirectional from a single origin of replication is the pattern of DNA synthesis in | procaryotes |
| portion of the genome that contains an origin and is replicated as a unit | replicon |
| bidirectional and multiple origins of replication is the pattern of DNA synthesis in | eukaryotes |
| some small circular genomes (e.g., viruses and plasmids)replicated by | rolling-circle mechanism |
| unzips the DNA helix | helicase |
| synthesizes an RNA primer | primase |
| adds bases to the new DNA chain; proofreading the chain for mistakes | DNA polymerase III |
| removes primer, closes gaps, and repairs mismatches | DNA polymerase I |
| supercoiling | gyrase |
| uses each strand as template and synthesizes complementary strands | DNA polymerase III |
| joins fragments to form complete strands of DNA | ligase |
| the manner in which genetic instructions for polypeptide synthesis are stored within genome | genetic code |
| sequence of base pairs in DNA corresponds to the amino acid sequence of polypeptide encoded | colinearity |
| genetic code word and specifies an amino acid | codon |
| codon meanings deciphered by | Marshall Nirenberg |
| up to six different codons can code for a single amino acid | code degeneracy |
| the 61 codons that specify amino acids | sense codons |
| the three codons used as translation termination signals (UGA,UAG, UAA)and they do not encode amino acids | stop codons |