In a dna molecule, what holds together nitrogenous bases from the two polymer chains?
a. phosphodiester bonds
b. ionic bonds
c. covalent bonds
d. peptide bonds
e. hydrogen bonds

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele