Lucia was looking at cells with a microscope. She knows that the cells are classified as either plant cells or animal cells. How
can she confirm that these cells are plant cells? she should look for a cell membrane surrounding the entire cell. She should look for a cell wall outside of the cell membrane. She should look for a small vacuole in the center of the cells. She should look for a cytoplasm that contains lysosomes.
Nucleic acids also typically contain phosphorous, and nitrogen plays an important structural role in nucleic and proteins. The proteins, being made up a diverse set of amino acids, have, in addition to carbon, hydrogen, oxygen, and nitrogen, the elements sulfur and selenium.
