What two factors determine the shape of a protein?

What does it mean for a cell membrane to be selectively permable

Which of these resources is used worldwide to make construction products, pottery, and porcelain

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.