Nucleic acids (DNA and RNA) are assembled from nucleotides, which consist of three components: a nitrogenous base, a five-carbon sugar (pentose), and phosphate. Five-Carbon Sugar Nucleic acids (as well as nucleosides and nucleotides) are classified according to the pentose they contain. If the … Read more
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Lichens are composite organisms that consist of a symbiotic relationship between a fungus and a photosynthetic partner, either a cyanobacterium or algae. The fungus provides structural support and protection for the photosynthetic partner, while the photosynthetic partner provides energy for … Read more
Fungi-General Account Mycologists, scientists who study fungi as well as fungi-like protists, believe there may be as many as 1.5 million fungal species. Fungi exist either as single-celled yeasts or in multicellular form with several different cell types. Their reproduction … Read more
During the development of a flower bud, a single megaspore mother cell in the ovule undergoes meiosis, producing four mega-spores (figure ). In most flowering plants, three of the megaspores soon disappear; the nucleus of the remaining mega-spore divides mitotically, and … Read more
Prokaryotes were largely responsible for creating the current properties of the atmosphere and the soil through billions of years of their activity. Today, they still affect the Earth and human life in many important ways. Prokaryotes are involved in cycling … Read more
