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Definition of cell membrane, fission, molecule, ionic compound, heterogeneous equilibrium, cortex, lecithin, calcium, active site, advice

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Definition of cell membrane (noun)
form plural: cell membranes

lamellar tissue that surrounds and covers a cell and its contents

Examples
The cell membrane is semi-permeable and is largely made up of proteins and phospholipids.

Definition of cell membrane
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Definition of fission (noun)
form: no plural

a method of asexual reproduction

Examples
Bacteria and amoebae reproduce by binary fission.

Definition of fission
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Definition of molecule (noun)
form plural: molecules

two or more atoms of the same or different elements that unite because of Van der Waal's forces

Examples
The hydrogen molecule is very small compared to a molecule of DNA.

Definition of molecule
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Definition of ionic compound (noun)
form plural: ionic compounds

a substance consisting of anions and cations that are joined together by their opposite charges.

Examples
Sodium chloride NaCl is an example of an ionic compound.

Definition of ionic compound
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Definition of heterogeneous equilibrium (noun)
form: no plural

an equilibrium system where the components are not in the same phase

Examples
Heterogeneous equilibrium results when calcium carbonate is heated in a closed space to form carbon dioxide and calcium oxide.

Definition of heterogeneous equilibrium
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Definition of cortex (noun)
form: no plural

outer layer of a gland or organ in the body; tissue next to the external layer in plants

Examples
The adrenal cortex and the cerebral cortex are examples of these outer layers or cortices.
In plant stems and roots the cortex is between vascular tissue and the epidermis.

Definition of cortex
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Definition of lecithin (noun)
form: no plural

phosphatidylcholine; phospholipid formed from phosphatidic acid and choline

Examples
Lecithin is a structural component found in cell membranes.

Definition of lecithin
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Definition of calcium (noun)
form: no plural

chemical element with the symbol Ca which is used to make bones and teeth

Examples
Calcium plays a role in muscle contraction, nerve conduction and blood clotting.

Definition of calcium
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Definition of active site (noun)
form plural: active sites

part of an enzyme where a substrate is accepted and is responsible for its catalytic activity

Examples
The coiling of an enzyme creates an active site with a precise 3-dimensional structure.

Definition of active site
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Definition of advice (noun)
form: no plural

recommendation

Examples
Medical advice is often ignored by patients.

Definition of advice
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