You live in a city in Florida on the Gulf of Mexico and are trying to figure out why the water at the beaches turned bright gree
n for several months during the summer. You discover the green comes from a photosynthetic organism that grew at great numbers due to fertilizer spill in a nearby river. You have isolated the organism and are now testing its DNA. You extract all the DNA from your sample and find that there are three distinct kinds of DNA. Which of the following organisms could have been responsible for the bloom: fungus, bacteria, or protist? How do you know?
Blue-green algae affect freshwater, and it has a direct correlation to agricultural and urban runoff.
The heavy rains last spring most likely caused Lake Okeechobee to discharge water containing blue-green algae into rivers and canals. The bright green sludge oozed onto docks, dams and rivers and through tributaries into the ocean.
Blue-green algae (cyanobacteria) are a group of prokaryotic, autotrophic microorganisms that contain the photosynthetic pigments (chlorophyll and phycocyanin), Therefore, the DNA shows bacteria
In eukaryotic cells (ex. plants and animals) the DNA is found in the nucleus of the cell. Structures called ribosomes build proteins (this process is called translation).
Farming emerged because being a nomad was no longer suitable for increasing population size. Farming allowed people to stay in one place and properly feed their families, which was a definite positive impact on population size.
