DNA structure. DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).
Energy is an ecosystem flows only one way.
Energy flows through an ecosystem in only one direction as it is passed from organisms at one trophic level or energy level to organisms in the next trophic level.
Rubidium...................
334 amino acids in the coding region of
a bacterial protein-encoding gene has 1002 base pairs of DNA. Amino acids<span> are organic compounds containing amine (-NH2) and carboxyl
(-COOH) functional groups, along with a side chain (R group) specific to each </span>amino acid.