Lesson 1.3 Microscopic Organisms on Earth Vocabulary Lesson 1.3 Microscopic Organisms on Earth

Compound Light Microscope

Compound Light Microscope A microscope that uses two or more lenses and a light source to magnify objects

Objective Lens

Objective Lens The lens on the bottom of a microscope’s body tube

Ocular Lens

Ocular Lens The lens at the top of the microscope’s body tube, nearest the observer’s eye

Electron Microscope

Electron Microscope A powerful microscope that uses beams of electrons, rather than a light source, to magnify samples being observed

Prokaryotes

Prokaryotes An organism that has a simple cell structure without a nucleus in each cell

Eukaryotes

Eukaryotes An organism with a nucleus in each cell

Cyanobacteria

Cyanobacteria Prokaryotic producers that produced oxygen as a waste gas that made Earth inhabitable for other living things

Protist

Protist A single-celled, eukaryotic organism that cannot be clearly classified as animal or plant

Diatoms

Diatom A very small photosynthetic protist that lives in either salt water or fresh water

Dinoflagellate

Dinoflagellate A protist that has characteristics of both plants and animals

Protozoan

Protozoan A protist that has no cell walls and can find and eat food.

Flagella

Flagella Long, hair like structures that whip and lash to help flagellates swim

Parasites

Parasites An organism that feeds off and harms other organisms

Cilia

Cilia Small, hair like projections extending from the outsides of some protist’s cells used for movement and for capturing food

Food Vacuole

Food Vacuole A structure inside certain cells where food is stored

Pseudopods

Pseudopods A cell extension used by protist to move about and capture food; means “false foot”

Amoeba

Amoeba A protist, found in fresh water, salt water, and soil, that uses pseudopods to move and take in food

Created By: Paige Rogers, Carlie McMahon, & Annamarie Rodriguez The End Created By: Paige Rogers, Carlie McMahon, & Annamarie Rodriguez