Indicate whether each of the following statements about the structure of DNA is true or false. (Each letter is used to refer to the concentration of that base in DNA.)

(a) A + T = G + C

(b) A = G; C = T

(c) A/T = C/G

(d) T/A = C/G

(e) A + G = C + T

(f) G/C = 1

(g) A = T within each single strand.

(h) Hydrogen bonding provides stability to the double helix in aqueous cytoplasms.

(i) Hydrophobic bonding provides stability to the double helix in aqueous cytoplasms.

(j) When separated, the two strands of a double helix are identical.

(k) Once the base sequence of one strand of a DNA double helix is known, the base sequence of the second strand can be deduced.

(l) The structure of a DNA double helix is invariant. 

(m) Each nucleotide pair contains two phosphate groups, two deoxyribose molecules, and two bases.