23. The bacterial repair system that cortmimathed bases aer polymevieation is al

Question

23. The bacterial repair system that cortmimathed bases aer polymevieation is alble ta discriminate between the old and wewly made DNA strands becnne a. the b older DNA is more likely to contain errors e. older DNA contains methyl groups at specifie sequenees d. e the DNA polymersse is attached to the new strand. new strand will eontain the Incorrect base if a misnmatch oceurs newer DNA contains methyl groups at specifle sequences 24. Excision repair corrects DNA by Removing a double-stranded fragment of damaged DNA Detecting, removing, and replacing a single stranded h a. Bxcilog bas nhnof daaged A . Excising the incorrect base from a nueleotide e Correcting A-T to G-C transitions traneous groups such as methyl or oxygen added by mutagens 25. Assume a researcher st r is studying the rll locus of phage T4. Three rll strains are obtained: ts and C. When co-infections are performed in & coll strain K() the following results are obtained: A × B-plaques form B × C-no plaques form The conclusion most consistent with these data is -plaques form A, B, and C carry mutations in three different genes. A and B carry mutations in the same gene, C is on a different gene. A and C carry mutations in the same gene, B is on a different gene. A, B, and C carry mutations in the same gene. B and C carry mutations in the same gene, A is on a different gene. a. c. d. e. 26. Trinucleotide repeats can expand or contract during replication by a. The nitrogenous bases undergoing chemical modifications (automerization) b. Transition mutations c. Transversion mutations d. Slipped mispairing

Explanation / Answer

Answer:

1) The bacterial repair system that corrects mismatched bases after polymerization is able to discriminate between the old and newly made DNA strands because:

2) Excision repair corrects DNA by:

3) Assume a researcher is studying the rII locus of phage T4. Three rH strains are obtained: A, B and C. When coinfections are performed in E.coli strain K(lambda) the following results are obtained
The conclusion most consistent with these data is:

4) Trinucleotide repeats can expand or contract during replication by

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