DNA is made up of pairs of nitrogenous bases. Which of the following nitrogenous bases is paired correctly?
A. Adenine-guanine
B. Guanine-cytosine
O c. Cytosine-thymine
O D. Guanine-guanine

Explain the process that creates the heat of the sun?

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.

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.