yeast. An ascomycete fungus. Generally reproduces by budding and often occurs as single cells.

z zeatin. A cytokinin isolated from corn, zoospore. A motile spore.

zygomorphic. Capable of being divided into similar halves by a single plane.

Bilaterally symmetrical. Said with regard to flowers, zygospore. A zygote that results from the fusion of isogametes, possesses a thick wall, and goes into a resting stage. Also, a zygote that becomes encysted. Found in organisms of the genus Spirogyra. zygote. A fertilized egg resulting from the fusion of two gametes, zygotene. The synaptic stage of meiosis during which homologous chromosomes are paired.

zymase. A complex of enzymes present in yeasts, bacteria, and higher plants. Facilitates glycolysis, the breakdown of sugar.

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