Binds to the DNA strand at a specific sequence of the gene called a promoter; Unwinds and unlinks the two strands of DNA; Uses one of the DNA strands as a guide or template; Matches new nucleotides with their complements on the DNA strand (G with C, A with U -- remember that RNA has uracil (U) instead of thymine (T))
Carbohydrates contain three major categories of molecules: monosaccharides (or simple sugars), disaccharides, and polysaccharides. 1. Monosaccharides: This group, also known as simple sugars, is the simplest carbohydrate form.
The sugar glucose is the major food molecule in the cell, but it is too energetic to use directly in most chemical reactions. To be useful, glucose is broken down into an energy storing molecule (ATP) that can be used throughout the cell.he sugar glucose is the major food molecule in the cell, but it is too energetic to use directly in most chemical reactions. To be useful, glucose is broken down into an energy storing molecule (ATP) that can be used throughout the cell.