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Definition of frameshift mutation, ovaries, electron shell, tympanic cavity, pupil, exoskeleton, tympanum, glass, myelin sheath, scurvy

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Definition of frameshift mutation (noun)
form: no plural

mutation in a DNA chain happening when the number of nucleotides is not three

Examples
Frameshift mutation is the addition or loss of nucleotides.

Definition of frameshift mutation
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Definition of ovaries (noun)
form: only plural

female gonads producing eggs and releasing the hormones estrogen and progesterone

Examples
The ovaries are located below the digestive system.

Definition of ovaries
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Definition of electron shell (noun)
form plural: electron shells

outer covering represented by a circle around the nucleus that contains electrons of comparative energies

Examples
The number of electrons in the outer electron shell determines the properties of atoms.

Definition of electron shell
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Definition of tympanic cavity (noun)
form plural: tympanic cavities

the middle ear

Examples
The tympanic cavity is a bony cavity that contains the ossicles.

Definition of tympanic cavity
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Definition of pupil (noun)
form plural: pupils

opening in the iris allowing light to pass through to the retina

Examples
Pupils dilate in dark environments to let in more light.

Definition of pupil
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Definition of exoskeleton (noun)
form: no plural

an external skeleton that provides protection and muscle attachment for locomotion

Examples
Arthropods and mollusks have an exoskeleton.

Definition of exoskeleton
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Definition of tympanum (noun)
form plural: tympana

the middle ear (tympanic cavity) and the eardrum (tympanic membrane)

Examples
The external ear collects soundwaves and sends them to the tympanum.

Definition of tympanum
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Definition of glass (noun)
form plural: glasses

ceramic material made from heating silica and oxides in a furnace and then cooling and setting it

Examples
As the liquid glass cools back to its melting point atom movement becomes restricted and disordered so it can be molded into shapes. As the glass cools further it sets hard.

Definition of glass
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Definition of myelin sheath (noun)
form: no plural

this is a layer of Schwann cells which covers the nerve axon

Examples
The myelin sheath is an electrical insulator.

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Definition of scurvy (noun)
form: no plural

disease caused by vitamin C deficiency

Examples
Treatment with vitamin C reverses the effects of scurvy.

Definition of scurvy
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