Which of the following accurately describes the structure of dna?
a. dna is in the form of antiparallel strands twisted as a double helix.
b. dna is made up of nucleotides, containing a 3-carbon sugar, a phosphate group, and base.
c. a always pairs with c, and g always pairs with t.
d. dna consists of four bases: a, g, c, and u.

option B. is wrong because nucleotides made of 5 - carbon sugars, not 3-C .option C is wrong because Apairs with T and C pairs with G not the other way around. option D is wrong as DNA consists of A,G,C and T. U is found in RNA. the correct answer is A. DNA is in the form of antiparallel strands twisted as a double helix. nucleotides together make strands, 2 of these strands which are antiparallel to each other twist around each other forming a double helix.
 
therefore A is the correct answer

The principle of independent assortment describee how different genes independently separate from one another when reproductive cells develop.