CLEP Biology Practice Test
Multiple Choice Practice Test
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In amphibian, vitellogenin is synthesized by
Vitellogenin is a precursor protein that is expressed in the females of all oviparous species including amphibians, fishes, reptiles and birds. Vitellogenin is a glycolipoprotein secreted by the liver. Vitellogenin can be expressed by the male (in a few species) in the presence of estrogenic endocrine disruptive chemicals. Vitellogenin precursors provide the major egg yolk proteins which serves as nutrients.