1) True. Nucleotides are the monomers of the polymeric chain. DNA is formed by two complementary polymeric strands.
2) True. Each DNA strand has a polarity or directionality and it is determined by the direction that nucleotides are pointing. Each nucleotide will have a 5' end phosphate on one side and a 3' hydroxyl end on the other. One strand will have 5'-3' direction and the complementary strand 3'-5'.
3) False. There are four different nucleotides that can be incorporated into a DNA strand, these are: Cytosine, Guanine, Adenine and Thymine.
4) True. Hydrogen bonds between Cytosine-Guanine (C-G) and Adenine-Thymine (A-T) in different strands hold the complementary DNA chains together.
When the fertility rate falls below replacement level, the population grows older and shrinks, which can slow economic growth and strain government budgets.
