R groups participate in which level of protein structure?

The atomic number of an atom represents the number of

The lipid that forms the foundation of cell membrane is primarily composed of molecules called

Which characteristic of life involves balance?

What does the nucleolus produce?

Spindle fibers disappear in which phase?

Matthew noticed that his house plants were wilting badly.  Which structure has lost all its contents?

Which organelle stores Calcium (Ca+2)?

Some antibiotics kill bacteria by preventing translation or production of proteins.  Which organelle does this antibiotic target?

The energy of life is