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Transcription continues until a termination series is reached. The most common termination signal is a GC-rich region which is a palindrome, followed by an AT-rich sequence. The RNA made from the DNA palindrome is self- complementary and so base pairs internally to form a hairpin structure rich in GC base pairs followed by four or more U residues shown in the figure. Though, not all termination sites have this hairpin structure. Those which lack such a structure require an additional protein, called rho (p), to help identify the termination site and stop transcription.
Style of Stigma Interaction The style has been distinguished into two types: In open styles a stylar canal is present which is lined with a well-developed glandul
What is the meaning of Darwin's expression "descent with modification"? Descent with modification refers to natural selection. Descent with modification refers to evolutionary chan
Q. How different are gymnosperms from pteridophytes and bryophytes? Gymnosperms are not cryptogamic as pteridophytes and bryophytes are. They are phanerogamic and so they form
Most of the water taken up by a plant passes through it and is evaporated to the atmosphere. What use is made of the tiny fraction of this water which is retained by the plant?
Nerve Cell - The Basic Unit The basic unit of the nervous system is the nerve cell or neuron. A neuron is to the nervous system what a brick is to the building. It has a cell
Q. Explain the process of Degradation of Proteins? Proteins are composed of amino acids combined by peptide linkages. The native proteins are resistant to attack by microo
what cause to hypertention?
Ventricular Septal Defect (VSD) In ventricular septal defect there is abnormal communication between right and left ventricle. Anatomically 90 per cent of all VSD are located
What is immunity
Emphysema Emphysema is destructive changes in alveolar walls and enlargement of air spaces distal to the terminal non-respiratory bronchioles. It is characterized physiolog
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