The ends of a chromosome are called telomeres. They prevent chromosomes from joining together when they are not supposed to.
Plicae, villi and microvilli increase the surface area for he absorption of nutrients
Answer:
Cell membranes are composed of lipids and proteins.
Adenine, Thymine, Cytosine and Guanine.
<u>Explanation</u>
In double helix, the nitrogenous bases of opposite nucleotides form pairs through hydrogen bonds. The nitrogenous base adenine of one nucleotide forms pair with thymine of opposite nucleotide, while cytosine forms pair with guanine.