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Definition of carcinogen, class, transition element, unconsciousness, nail, globular protein, polymer, carbon, colony, metabolism

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Definition of carcinogen (noun)
form plural: carcinogens

a substance that causes cancer

Examples
Tobacco smoke is a known carcinogen.

Definition of carcinogen
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Definition of class (noun)
form plural: classes

a group of organisms

Examples
A class ranks below a phylum and above an order.

Definition of class
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Definition of transition element (noun)
form plural: transition elements

any of the metallic elements having an incomplete inner electron shell

Examples
In the periodic table transition elements have partly filled d sublevels.

Definition of transition element
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Definition of unconsciousness (noun)
form: no plural

being unable to respond to the environment; being unaware of the environment

Examples
General anaesthesia induces a state of unconsciousness.

Definition of unconsciousness
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Definition of nail (noun)
form plural: nails

hard structure; made of keratin; found on the back of the fingertips

Examples
Nails are formed from the epidermis and so are parts of the integumentary system.

Definition of nail
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Definition of globular protein (noun)
form plural: globular proteins

the polypeptide chains of the protein are folded into a round shape

Examples
Many enzymes are globular proteins.

Definition of globular protein
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Definition of polymer (noun)
form plural: polymers

a giant molecule made up of repeated units of monomers

Examples
Polymers can be broken down to their components by hydrolysis.

Definition of polymer
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Definition of carbon (noun)
form: no plural

element that makes up most organic molecules and can form 4 bonds with other atoms

Examples
Carbon has the chemical symbol C and makes up 18% of a human body.

Definition of carbon
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Definition of colony (noun)
form plural: colonies

collections of bacterial cells

Examples
Bacterial colonies can be cultivated on agar.

Definition of colony
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Definition of metabolism (noun)
form: no plural

all of the energetic reactions that take place in a cell or organism

Examples
Cellular metabolism produces energy and raw materials for the cell to renew itself.

Definition of metabolism
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