Answer:
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).
Explanation:
The slowing down of the ray of light also causes the light to change direction
1) Ribosomes
2) Nucleus
3) Mitochondria
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