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A tiny cell structure that carries out a specific function within the cell


A body structure that is composed of different kinds of tissues that work together

Organ system

A group of organs that work together to perform a major function

Cellular respiration

The process in which oxygen and glucose undergo a complex series of chemical reactions inside cells, releasing energy.


A green photosynthetic pigment found in the chloroplasts of plants, algae, and some bacteria.


The process by which plants and other autotrophs capture and use light energy to make food from carbon dioxide and water


A threadlike structure within a cell's nucleus that contains DNA that is passed from one generation to the next


A small grain-shaped organelle in the cytoplasm of a cell that produces proteins


Large organic molecule made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur

Golgi Apparatus

An organelle in a cell that receives proteins and other newly formed materials from the endoplasmic reticulum, packages them, and distributes them to other parts of the cell


In cells, a large oval organelle that contains the cell's genetic material in the form of DNA and controls many of the cell's activities


A pure substance that cannot be broken down into other substances by chemical or physical means

Double Helix

The shape of a DNA molecule


The thick fluid region of a cell located inside the cell membrane or between the cell membrane and nucleus


Rod-shaped organelles that convert energy in food molecules to energy the cell can use to carry out its functions


A cell organelle which contains chemicals that break down large food particles into smaller ones and that can be used by the rest of the cell.


An organism that cannot make its own food and gets food by consuming other living things

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