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The trp (tryptophan) operon which is shown in the figure will have five structural genes encoding enzymes for tryptophan biosynthesis with an upstream Ptrp (trp promoter) and Otrp (trp operator series). The trp operator region in part overlaps the trp promoter. The operon is regulated like that transcription happens when tryptophan in the cell is in short supply.
Many patients who are weak, fearful or shot of breath find it essential to hold tightly to the handrail while walking. If accurate aerobic information is to be obtained handrail su
Define Mechanism for Copper Absorption? As in the case of other minerals, copper absorption appears to occur by two mechanisms: i) Saturable active mechanism, which operates
Xylem transfer cells The lateral transport of ions from root xylem to leaves probably takes place via xylem transfer cells which have two special features: The ce
Closed Style - Style of Stigma Interaction Cotton shows an epidermis with stomata, a cortex of thin-walled parenchyma with several vascular bundles and strands of transmitting
Define Food Components Other Than Essential Nutrients? In the previous units so far, we have read about the six major nutrients, which are essential for us. Though these vary i
Why Fish and Sea Foods are important for human Body? They are rich sources of proteins (20-25%) of a high biological value. Dry fishes contain more (60%) proteins since most of
Caffeine and alcohol both block the secretion of ADH from the posterior pituitary gland. Explain what this does to fluid balance. Does it make sense to drink caffeine before an ath
State the term - Migraine Stroke Since the late 1800s, physicians have recognised that migraine attacks may lead to infarcts and permanent neurological deficits. Such migraine
Explain the Use and Care of Microscope? Proper care and maintenance of microscope is needed. Following points should be kept in mind while handling the microscope: (i) Instr
Enumerate the Sizes and shapes of eukaryotic and prokaryotic cells It is thus possible, due to these similarities, to generalise about the structures and functions of cells. In
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