Describe the progression of an hiv infection over time with regard to the number of circulating viruses, host antibodies, and cd4 t cells.

Adistinctive characteristic of mammals that is not observed in other vertebrates is

List the substances normally stored in bone tissue

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.