Under the restrictive conditions a conditional mutation expresses its mutant phenotype and under the permissive conditions expresses the normal phenotype. First type of conditional mutation is a temperature-sensitive mutation, that expresses the mutant phenotype only at certain temperatures. Strains of E.coli have been isolated that contain temperature-sensitive mutations in genes encoding different components of the replication machinery. In the each of these strains, the protein produced by the mutated gene is nonfunctional under the restrictive conditions. You grow these strains under the permissive conditions and then abruptly switch them to the restrictive conditions. After one round of replication under the restrictive conditions, you isolate DNA from each strain and analyze it. What characteristics would you expect to see in the DNA isolated from a strain with a temperature-sensitive mutation in the gene that encodes each of the following proteins? 1. DNA ligase 2. DNA polymerase I 3. DNA polymerase III 4. Primase 5. Initiator protein

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Under the restrictive conditions a conditional mutation expresses its mutant
phenotype and under the permissive conditions expresses the normal
phenotype. First type of conditional mutation is a temperature-sensitive
mutation, that expresses the mutant phenotype only at certain temperatures.
Strains of E.coli have been isolated that contain temperature-sensitive
mutations in genes encoding different components of the replication
machinery. In the each of these strains, the protein produced by the mutated
gene is nonfunctional under the restrictive conditions. You grow these strains
under the permissive conditions and then abruptly switch them to the
restrictive conditions. After one round of replication under the restrictive
conditions, you isolate DNA from each strain and analyze it. What
characteristics would you expect to see in the DNA isolated from a strain with
a temperature-sensitive mutation in the gene that encodes each of the
following proteins?
1. DNA ligase
2. DNA polymerase I
3. DNA polymerase III
4. Primase
5. Initiator protein
Transcribed Image Text:Under the restrictive conditions a conditional mutation expresses its mutant phenotype and under the permissive conditions expresses the normal phenotype. First type of conditional mutation is a temperature-sensitive mutation, that expresses the mutant phenotype only at certain temperatures. Strains of E.coli have been isolated that contain temperature-sensitive mutations in genes encoding different components of the replication machinery. In the each of these strains, the protein produced by the mutated gene is nonfunctional under the restrictive conditions. You grow these strains under the permissive conditions and then abruptly switch them to the restrictive conditions. After one round of replication under the restrictive conditions, you isolate DNA from each strain and analyze it. What characteristics would you expect to see in the DNA isolated from a strain with a temperature-sensitive mutation in the gene that encodes each of the following proteins? 1. DNA ligase 2. DNA polymerase I 3. DNA polymerase III 4. Primase 5. Initiator protein
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