Abjad V

JEJAK MAHASISWA	..:: KAMUS BIOLOGI JEJAK MAHASISWA ::..															Dibuat 12/19/2011
		A	B	C	D	E	F	G	H	I	J	K	L	M
		N	O	P	Q	R	S	T	U	V	W	X	Y	Z
Glosarium ini diambil dari Buku Biologi Campbell | Jejak Mahasiswa

vaccine

A harmless variant or derivative of a pathogen that stimulates a host's immune system to mount defenses against the pathogen.

vacuole

A membrane-enclosed sac taking up most of the interior of a mature plant cell and containing a variety of substances important in plant reproduction, growth, and development.

vagina

Part of the female reproductive system between the uterus and the outside opening; the birth canal in mammals; also accommodates the male's penis and receives sperm during copulation.

valence shell

The outermost energy shell of an atom, containing the valence electrons involved in the chemical reactions of that atom.

vas deferens

The tube in the male reproductive system in which sperm travel from the epididymis to the urethra.

vascular cambium

A continuous cylinder of meristematic cells surrounding the xylem and pith that produces secondary xylem and phloem.

vascular plants

Plants with vascular tissue, consisting of all modern species except the mosses and their relatives.

vascular tissue system

A system formed by xylem and phloem throughout the plant, serving as a transport system for water and nutrients, respectively.

vascular tissue

Plant tissue consisting of cells joined into tubes that transport water and nutrients throughout the plant body.

vegetative reproduction

Cloning of plants by asexual means.

vein

A vessel that returns blood to the heart.

ventilation

Any method of increasing contact between the respiratory medium and the respiratory surface.

vertebrate

A chordate animal with a backbone: the mammals, birds, reptiles, amphibians, and various classes of fishes.

vessel element

A specialized short, wide cell in angiosperms; arranged end to end, they form continuous tubes for water transport.

vestigial organ

A type of homologous structure that is rudimentary and of marginal or no use to the organism.

viroid

(VY-roid) A plant pathogen composed of molecules of naked RNA only several hundred nucleotides long.

visceral muscle

Smooth muscle found in the walls of the digestive tract, bladder, arteries, and other internal organs.

visible light

That portion of the electromagnetic spectrum detected as various colors by the human eye, ranging in wavelength from about 400 nm to about 700 nm.

vitalism

The belief that natural phenomena are governed by a life force outside the realm of physical and chemical laws.

vitamin

An organic molecule required in the diet in very small amounts; vitamins serve primarily as coenzymes or parts of coenzymes.

viviparous

(vy-VIP-er-us) Referring to a type of development in which the young are born alive after having been nourished in the uterus by blood from the placenta.

voltage-gated channel

Ion channel in a membrane that opens and closes in response to changes in membrane potential (voltage); the sodium and potassium channels of neurons are examples.