Explanation: The basic unit of a DNA is a Nucleotide. The nucleotide comprises of: the nitrogenous bases, a deoxyribose sugar and a phosphate group. The nitrogenous bases are the purines and pyrimidines . The include, Adenine, guanine, Thymine and cytosine
The DNa molecule is made up of two antiparallel strands and complementary to each other. That's because each strand is polynucleotide, which means it is made up of several nucleotides.
Each nucleotide is formed by a nitrogenous base, a phosphate group and a sugar. The heterogenated bases of DNA are: adenine, guanine, thymine and cytosine, and they are responsible for linking the two strands of DNA, since the adenine of one strand is able to make connections with the thymine of the other strand and guanine from one strand is capable of making connections with the cytosine of another strand.
Fermentation occurs in anaerobic respiration, and produces less energy than in aerobic respiration due to the lack of ETC because oxygen is not present.
