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25 terms

Cells

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tissue
a group of similar cells that work together to perform a specific job in the body
organ
a combination of two or more tissues that work together to perform a specific function in the body
organ system
a group of organs working together to perform body functions
organism
anything that an independently carry out life processes
unicellular
made of a single cell
multicellular
made of many cells
population
a group of individuals of the same species that live together in the same area at the same time
community
all of the populations of different species that live and interact in an area
ecosystem
a community of organisms and their nonliving environment
cell membrane
a phospholipid layer that covers a cell's surface and acts as a barrier between the inside of a cell and the cell's environment
organelles
structures within a cell, sometimes surrounded by a membrane
cytoplasm
cellular fluid surrounding a cell's organelles
nucleus
membrane-covered organelle found in eukaryotic cells that contains a cell's DNA and serves as a control center for the cell
prokaryotic
describes a cell that does not have a nucleus or any other membrane-covered organelles; also called bacteria
eukaryotic
describes a cell that has a nucleus
bacteria
extremely small single-celled organisms without a nucleus; prokaryotic cells
cell wall
a structure that surrounds the cell membrane of some cells and provides strength and support to the cell membrane
ribosome
a small organelle in cells where proteins are made from amino acids
endoplasmic reticulum
a membrane-covered cell organelle that produces lipids, breaks down drugs and other substances, and packages proteins for delivery out of the cell
mitochondria
cell organelles surrounded by two membranes that break down food molecules to make ATP
chloroplast
an organelle found in plant and algae cells where photosynthesis occurs
Golgi complex
the cell organelle that modifies, packages, and transports materials out of the cell
vesicle
a membrane-covered compartment in a eukaryotic cell that forms when part of the cell membrane surrounds an object and pinches off
vacuole
a large membrane-covered structure found in plant cells that serve as storage containers for water and other liquids
lysosome
a special vesicle in cells that digests food particles, wastes, and foreign invaders