His operon
(Science: molecular biology) An operon which governs the synthesis of the amino acid histidine out of atp and phosphoribosyl pyrophosphate. The his operon was first observed in and described for the bacteria salmonella typhinurium.
The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..
Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..
Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..
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This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..
