What are sections of DNA that code for proteins?

Ineed the definitions of all of these words nasap i will give 1o points to whoever awnsers

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

The production of cells during mitosis into specialized function is recombination or differentiation