Dr. Paul's Virtually Biology Show.

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V,W,Z,Y,Z

Vacuole. In cells, a membrane bound organelle for containing material usually water. Important cells a large water filled central vacuole is important in water balance.

Vascular tissue. In plants, one of the three main types of tissue, this tissue consists of tubes and associated cells which transport water and nutrients throughout the plant.

Vesicle. Literally "small vessel". A small membrane bound sac for transport of material throughout the cell.

Vitamin. An organic molecule that cannot be produced by the body but is needed by the body in trace amounts. Vitamins come in two general types. The water soluble vitamins such as ascorbic acid(vitamin C) are often important coenzymes or components thereof. The lipid soluble vitamins have a broader range of functions.

Wavelength. For light or sound, or other wave, the distance between one crest of the wave to the next crest. For visible light the wavelength is typically measured in nanometers(1 billionth of a meter). For longer wavelengths of light such as radio waves the wavelengths are measured in meters or longer.
Wax. A lipid consisting of long chain fatty acids. Waxes are used by organisms to form water proof layers or structures.
X linked gene. A gene located on the X chromosome. See sex linkage.

Xylem. In vascular plants, the Vascular tissue that conducts water and minerals from the roots to the leaves.

Zygote. A diploid cell formed by the union of two gametes. Zygotes give rise to new multicellular organisms.
Zygospore. In fungi, an encapsulated resistant zygote.