b. the axis has a slight tilt
Here are some key features of DNA polymerases:<span>They can only add nucleotides to the 3 end of a DNA strandThey can't start making a DNA chain from scratch but require a pre-existing chain or short stretch of nucleotides called a primerThey check their work, removing the vast majority of "wrong" nucleotides that are accidentally added to the chain</span>
<span>Gametes are haploid cells that fuses with another haploid cell during fertilization. For human being, the gametes are the egg cells and the sperm cells and human fertilization is the union of a human egg and sperm, which usually occur in the ampulla of the fallopian tube. </span>
