The bluegreen algae have in the past and continue to be very important organisms in terms of the overall success of life on earth. Many cyanophytes are capable of nitrogen fixation, wherein they take N 2 gas from the atmosphere and convert it into other forms of N-containing compounds that plants and animals can use. In the distant past, cyanophytes were very abundant and left fossil colonies known as stromatolites . Sketch and label these organisms in your lab notebook. Eukaryotic cells characterize all forms of life except the bacteria.
Eukaryotic cells are on average much larger and internally more complex than prokaryotic cells.
All animals, plants and fungi, as well as most algae and the numerous unicellular forms of life known as protozoans are eukaryotic. The internal structuring of eukaryotic cells is evident by the presence of many structurally and functionally diverse cytoplasmic organelles. The organelles are themselves defined by the presence of a membrane that separates them from the rest of the cytoplasm and other organelles. Storage and processing of DNA Endoplasmic reticulum . Golgi bodies .