Question

use the information below to answer the question. 5- tcg gtc act tat ctc - 3 a portion of a dna molecule is shown. when the dna molecule was replicated, one base was added at the position indicated by the arrow. the addition of the base will most likely cause which effect? a the dna molecule will be targeted for destruction. b the dna molecule will be avoided by the transcription machinery. c the sequence following the added base will be duplicated during transcription. d the sequence following the added base will result in a completely different amino - acid chain.

Explanation:

When a base is added to a DNA molecule during replication, it can cause a frameshift mutation. This will change the reading - frame of the codons during translation, leading to a completely different amino - acid chain. A targeted destruction would require a specific mechanism to identify and destroy the DNA, and addition of a base doesn't directly target it for destruction. Transcription machinery reads the DNA sequence but addition of a base doesn't necessarily avoid it. Duplication during transcription is not the main effect of adding a base during DNA replication.

Answer:

d. The sequence following the added base will result in a completely different amino acid chain.