What factor maintains the same distance between strands in a dna molecule?
a. pairing of double-ringed bases with triple-ringed bases
b. pairing of single-ringed bases with double-ringed bases
c. pairing of double-ringed bases with double-ringed bases
d. pairing of single-ringed bases with single-ringed bases

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic.b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy.c. all bacterial enzymes are harmful to humans and the environment.d. microbes create pollutants and toxins that harm the environment.