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The in Biological Dictionary

Zygotene

... Meiosis. From Wikipedia, the free encyclopedia (Redirected from Zygotene ) .....5 Diakinesis ... Definition of zygotene from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. zygotene ( ) n....

Zoology

... Zoology , also spelled zoölogy, is the branch of biology that focuses on the structure, function, behavior, and evolution of animals. the zoologist's pronunciation of " zoology &q...

Zygote

...a term in Developmental biology used to describe the first stage of a new unique organism when it consists of just a single cell. the term is also used more loosely to refer to the group of cells formed by...

Zygospore

...rt of a fungus, a chlamydospore that is created by the nuclear fusion of haploid hyphae of different mating types. Definition of zygospore from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. Synonyms of zygospore fr...

Zona pellucida

... the zona pellucida is a glycoprotein membrane surrounding the plasma membrane of an oocyte. It is a vital constitutive part of the latter, external but not extraneous to it....

Z-DNA

... Z - DNA is one of the many possible double helical structures of DNA . ...is a left-handed double helical structure in which the double helix winds to the left in a zig-zag pattern . Z - DNA is thought t...

Zinc finger

...er protein (ZFP) target sites and for designing the proteins that will target them. ... the Zinc Finger Consortium (www.zincfingers.org) was established to promote ... the information for...

Yolk plug

... Yolk plug is the remaining patch of endodermal cells that is created during the formation of the ventral lip of...

Yellow fever

...r is an acute viral disease. It is transmitted by the bite of mosquitoes . Yellow fever is an importan... countries despite existence of an effective... the disease is caused by the yellow fever virus, which belongs to...

Yolk

... egg yolk is a part of an egg which serves as the food source for the developing embryo. the egg yolk is suspended in...

Y chromosome

... the Y chromosome is the sex-determining chromosome in most mammals, including humans. In mammals, it contains the gene SRY, which triggers testis development, thu...

X-ray diffraction

...alytical techniques which reveal information about the crystallographic structure, chemical composition, ... - ray crystallography is a method of determining the arrangement of atoms within a crystal, in which a ... and diffracts into many specific directions. From the angles and intensities of these... X-ray powd...

Xylem

... In vascular plants, xylem is one of the two types of transport tissue, phloem being the other. the word " xylem " is derived from classical...

Xeroderma pigmentosum

...recessive genetic disorder of DNA repair in which the ability to repair damage caused by ultraviolet (UV...recessive genetic disorder of DNA repair in which the ability to repair damage caused by ultraviolet (UV...en described. ... Important It is possible that the main title of...

Xenobiology

...ogy (also known as exobiology or astrobiology) is the term for a ... Xenobiology also figures in much science fiction as the fictional science of the ... ...

Xenopus

...e to Sub-Saharan Africa. There are 18 species in the Xenopus genus. They are known collectively as African Clawed Frogs or Platanna. the best-known species belonging to this... the African clawed frog is a species of South Africa...

Xanthophyll

...riginally phylloxanthins) are yellow pigments from the carotenoid ... In diatoms and dinoflagellates the xanthophyll cycle consists of the pigment ... xanthophyll ( ) n. A yellow car...

Wolffian duct

...les (bottom) ... These embryonic structures are the Wolffian and Müllerian ducts . ... In the male the Wolffian duct persists, and forms...

X chromosome

... the X chromosome was named for its unique properties by early researchers, and ... the X chromosome carries a couple thousand genes but few, if any, of these have ... the X chromosome spans about 155 million base pa...

Wild-type

... Wild type refers to the phenotype of the typical form of a species as it occurs in nature. Originally, the wild type was conceptualized as a product of...

Wobble base pair

... pairing between two nucleotides in RNA molecules. the four main wobble base pairs are guanine-uracil...ne-uracil, inosine-adenine, and inosine-cytosine . the thermodynamic stability of a wobble base ... ...n genetics translation. Milankovitch wobble , the change in...

Wildtype

... Wild type refers to the phenotype of the typical form of a species as it occurs in nature. Originally, the wild type was conceptualized as a product of...

Wild type

... Wild type refers to the phenotype of the typical form of a species as it occurs in nature. Originally, the wild type was conceptualized as a product of...

White blood cells

...ood cells (WBCs), or leukocytes, are cells of the immune system defending the body against both infectious disease and foreign m...they are all produced... White Blood Cells is the third album by...

Western blotting

... the western blot (alternatively, protein immun... Western blotting . ... Information about the Western Blot technique. Learn the western blotting protocol and method, troubles...

Western blot

... the western blot is an analytical technique used to ...sis to separate native or denatured proteins by the length of the polypeptide or by...

Weed

...general sense is a plant that is considered by the user of the term to be a nuisance, and normally applied to unw...city located in Siskiyou County, California. As of the 2000 Census,...

Voluntary muscle

...striated muscle tissue existing under control of the somatic nervous system. It is one of three major muscle types, the others being cardiac and smooth muscle . As its n... skeletal... These muscles are not as free as the voluntary muscles such as those in...

Walking legs

... the arthropod leg is a form of jointed appendage of ...n: part I, on legs " ... In walking the body "vaults" over the leg on...

VNTR

...of different alleles may exist, each with ... If the fragments of DNA containing the VNTR alleles are to be separated on the ... VNTR ....

Vitelline membrane

... the vitelline membrane is a structure directly adjacent to the outer surface of the plasma membrane of an ovum. It is composed mos...

VLSI

... Very-large-scale integration ( VLSI ) is the process of creating integrated circuits by combini...based circuits into a single chip. VLSI began in the 1970s when complex semiconductor and communication...igned and manufactured custom and semi-custom ICs. the company was based in Silicon Valley, with headquar...

Vitamins

...antities by an organism, and must be obtained from the diet.... the B vitamins are eight water-soluble vitamins th...mportant roles in cell metabolism. Historically, the B vitamins were once thought to be a single vita...

Viscera

...of an animal, in particular an internal organ of the thorax or abdomen. the viscera , when removed from a butchered animal, a...nt (WWE). He is... Definition of viscera from the Merriam-Webster Online Dictionary with audio pronu...

Vitamin

...antities by an organism, and must be obtained from the diet.... Vitamin C or L-ascorbic acid is an essential ... the pharmacophore of vitamin C is the ascorbate ion. ... 2.2 Vitamin C in evolution....

Virus

...mals and plants, to bacteria and archaea. Since the initial discovery of tobacco mosaic... A comput...that can copy itself and infect a computer without the permission or knowledge of the owner....

Virulence

... Virulence is the degree of pathogenicity of an organism: the relative ability of a pathogen to cause disease. the noun virulence derives from...

Virology

... Virology is the study of viruses and virus-like agents: their stru...fect and exploit cells for virus reproduction, the diseases they cause, the techniques to isolate and culture them, and thei...

Viral oncogene

... If the viral LTRs are close enough to that oncogene...te ... called viral - oncogene (v-onc), and the infected cell is transformed as soon as ... v...log (avian), also known as REL, is a human gene. the protein encoded by...

Vestigial organ

...ial organs have demonstrated remarkably how ... the term ? vestigial organ ? ... the standard definition of vestigial ' is an organ that once was useful in an ... the list of vestigial organs in humans has shrunk ...
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