Which of these DNA alterations can be repaired by photolyase in prokaryotes?

The structure of DNA has the following properties The bases are directly attached to the phosphate groups in the backbone

Self-splicing introns

These mutations are likely to have the consequences described UV-induced thymine dimer repaired by nucleotide excision repair results in no change to the DNA sequence 

Which of the following statements about nucleotides are true and which are false?    Both DNA and RNA normally contain uracil

  This DNA sequence occurs within the coding sequence of a gene. The first three nucleotides (underlined) code for glutamic acid (Glu).  The following DNA mutation is likely to result in a shorter than normal protein: T -> C at position 80

What is most commonly found in the E site of ribosomes?

During protein synthesis, the tRNA aminoacyl synthetase acts to:    serve as the first initiation factor during ribosome assembly

5’ to 5’ linkages are found in nucleic acids: in tRNAs as a post-transcriptional modification

  You next purify the same protein from another strain, sequence the same portion of the protein, and determine that it has a mutation. The first five amino acids are now:                   Met – Gly – Val – Thr – …… What was the single-base change in the RNA that caused it to encode the new amino acid sequence?