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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.
Morphogenesis and Totipotency A chlamydomonas mother cell gives rise to two daughter cells by a simple division. But a leaf cell cannot give rise to a new plant except in cas
a) Which vitamin helps to maintain resistance to infectious diseases? b) Name two foods which are a good source of this vitamin. a) Vitamin A (retinol) helps m
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
Explain Stavudine It can be given either in initial combination therapy or after failure of regimens containing other NRTIs. Cross-resistance with zidovudine is frequent, ho
How can the concept of recombination frequency be used in genetic mapping? Genetic mapping is the determination of the location of the genes in a chromosome. By determining
Explain the interaction of vitamin a with Proteins? Proteins: The protein status of an individual influences vitamin A status and transport because an inadequate protein intake
LEVELS OF PREVENTION AND ROLE OF A NURSE: Caplan describes the levels of prevention as follows: 1) Primary Prevention It is concerned with reduction of incidence
D-glucose differs from D-galactose only in the arrangement around carbon 4. Therefore D-glucose and D-galactose are- Select one: a. enantiomers b. epimers c. mirror ima
HOW MANY PHYLUM OF ANIMALS?
Q. Why are pteridophytes more common in humid places? Pteridophytes are more common in humid places since they depend on water for their gametes to fecundate one another. In hu
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