How could disease causing bacteria get inside a cell without damaging the cell membrane

Which type of respiration takes place when there is no oxygen present

Nh3 +02-no + h20 is unbalanced what is the balanced equation

According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this?               a.  this implies that dna and proteins aren't essential in cells today.    b.  this implies that rna can catalyze any chemical reaction that enzymes catalyze.    c.  this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna.    d.  this implies that dna and proteins evolved after rna.