What choice is a difference between deoxyribonucleotides and ribonucleotides?

Which of the following best describes the difference between photolyase and nucleotide excision DNA repair mechanism?

Of the choices below, which do you think is the most likely outcome if the co-repressor binding site of the tryptophan (trp) repressor was mutated such that the trp repressor could not bind tryptophan?

What is a similarity between the bacteriophage lytic cycle and transduction?

DNA replication from the origin of transfer goes in 1 direction.

Which best describes lysogenic conversion?  

Which choice best describes how the Ames test determines whether or not a test chemical is a mutagen? 

In the mutant sequence below, pick the choice that describes the mutation types at the DNA level and the protein level.  5′ UUU  CAU  AAG   UAC  AGC 3′  — Normal mRNA 5′ UUU  CAU  AAG   UAA  AGC 3′  — mRNA with mutation

Which choice is the complementary DNA sequence to 5’ GATTCG 3’ 

All LIVING organisms use which molecule(s) for their genetic (hereditary) material?