Endocytosis and exocytosis are forms of active transport What is active transport? O the movement of molecules up a concentration gradient from low to high, using energy
O the movement of molecules down a concentration gradient from high to low, using energy
O the movement of molecules up a concentration gradient from low to high, using no energy
o the movement of molecules down a concentration gradient from high to low, using no energy​

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.