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What structure of the body falls between cells and organs in complexity?
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What structure of a cell is enclosed by a membrane and contains most of the cell’s dna?
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What structure is the site of all of the basic biochemical processes that keep organisms alive?
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What structure is made from dna and protein molecules coiled together?
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What structure is found at the top of the head of the sperm that helps it penetrate and fertilize the egg?
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What structure is an organelle that contains enzymes that break down and digest unneeded cellular components?
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What structure is a larger assembly of several polypeptide chains that are now referred to as subunits of the protein?
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What structure does methane have?
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What structure consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast?
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What structure connects the pharynx to the trachea?
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What structure connects the fetus to the placenta, allowing the exchange of gases?
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What strong and lightweight manmade material is derived from hydrocarbons and used in ropes, tents and parachutes?
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What stored form of energy is made up of glycerol and three fatty acid chains?
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What stimulates the changes of pubery?
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What still causes fatal lung disease in nonsmokers?
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What states that chemical reactions occur when atoms, ions, or molecules collide?
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What state of matter takes neither the shape nor the volume of its container?
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What state of matter is characterized by tiny particles separated by large distances, which do not experience any force of attraction or repulsion with each other?
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What state of matter has a definite volume, but takes the shape of the container?
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What state of matter has a definite volume, but not a definite shape?
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