The molecules that contain instructions for building proteins are <em>B.) DNA molecules</em><em />
DNA consists of molecules called nucloetides. Each nucleotide contains a phosphate group, sugar group, and nitrogen base. There are four bases: cytosine (C), thymine (T), adenine (A), and guanine (G). The order of these bases is what determines the genetic code, or DNA instructions.
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People can get chemical energy from food (carbohydrates)
Answer:
They use less metabolic energy and they help the animal move faster.
The answer to the question is d. tissues
Answer:
The myofibrils are the contractile organelles in the muscle fibers.
