Diatoms: Unicellular Organisms

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This is a view through a microscope. You're looking at an area that's about two millimeters in diameter. Within it you can see several species of marine diatom. Diatoms are unicellular organisms that live in a shell made of glass. It's called a frustule. They build their frustules themselves using silica collected from their environment. A solid glass shell can be a good thing when you're at the bottom of the food chain. They're photosynthetic, meaning they live by harvesting energy from sunlight. Diatoms come in two forms: pennate, and centric. You can see both in this image. Over on the left are three centric diatoms, their frustules are decorated with spiky protrusions at each end. Towards the bottom right there is another centric diatom,

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mitochondria. b. Cyanobacteria became chloroplasts after being taken up by eukaryotic cells. c. Giardia lamblia has two nuclei but no mitochondria, suggesting that a nucleated cell preceded the acquisition of mitochondria. 2. Although many protists are unicellular, they are highly complex. a. Amoeboids and ciliates possess unique organelles, such as contractile vacuoles. 3. Most protists are free-living; some are parasitic, some (e.g., slime molds) are saprophytic (feed on decaying plant material), and…

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make more plants. What a cell? It is the basic unit of life that makes up all living things. Cells produce other cells, and therefore they are organisms. Cells are the basic building blocks of organisms. They perform all life processes within the cell. The complex organisms are organized into tissues, organs, and organ systems. Complex organisms are organized as follows: Groups of similar cells work together and form tissues Tissues make up organs Organs make up organ systems, such as…

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