During HIV viral infection, the Tat protein acts to: 

The structure of DNA has the following properties The bases are directly attached to the deoxyribose

A ribonucleotide triphosphate used in RNA synthesis has an OH group on this carbon in the sugar portion of the nucleotide:      4′

Which of these DNA alterations can be repaired by base excision repair? 

  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 mRNA: G -> C at position 70  

x   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 mRNA: A -> T at position 82

RNA contains uracil instead of cytosine

A ribonucleotide triphosphate used in RNA synthesis has an OH group on this carbon in the sugar portion of the nucleotide:      2′

In partially diploid E. coli cells with the genotype: F’ i+ o- z+ y- a- / chromosome i- o+ z- y+ a+, which functional gene product(s) would be expressed at high level in the absence of both lactose and glucose?    permease

What kind of mutation is caused by intercalating agents such as proflavin?