What kind of atoms typically have unstable nuclei?
a. atoms with a neutron count less than 90
b. atoms with a neutron count greater than 90
c. atoms with a proton count less than 90
d. atoms with a proton count greater than 90

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.