The sides of the DNA ladder are made of two molecules that alternate. The alternating molecules are __?__ and __?__.

The instructions for the genetic traits of an organism are directly determined by the a-numbers of a,t,c and g units in a sugar molecule b-sequence of the bases in dna molecules c-length of a dna molecules d-way the bases are paired in the two strands of a dna molecule

Match the types of competition to their descriptions.

How do accessory pigments chlorophyll?