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Sickle cell anaemia in man is caused by a defective chain of haemoglobin. The abnormal haemoglobin known as MbS differs from natural haemoglobin (HhA) in one amino acid. A substitutional mutation causes the replacement of glutamic acid by valine in the sixth position from the amino terminal end of the Q chain polypeptide. This is because instead of the triplet GAA or GAG which codes for glutarnic acid in normal chains, the abnormal mRNA has GUA or GUG which codes for valine. IdbS in deoxygenated state precipitates out of solution forming elongate crystals. 'The formation of crystals in turn produces a characteristic deformation of RBCs and the cells acquire a crescent or sickle shape, hence the name sickle cell anaemia. The deformation of red cell weakens the red cell membrane and lyses the cells. The loss of red cells and haemoglobin leads to anaemia and this causes oxygen deficiency to the tissues per unit time. Pt, single substitution, more specifically, replacing the thymine by adenine in the second position of the sixth triplet of the P chain gene triggers a variety of responses that affects several aspects of the pfnysiology of the organism. Individuals who are homozygous (HbSiHbS) for the gene usually die early in life. In heterozygotes some proporrion of red cells lyse periodically but this does not cause any serious harm to the individual and in any case the survival is not affected.
which organs are involved in respiration of annelid and what is it called ,what by products are formed and how amount of ATP is released?
First Stage of Invagination The large endodermal cells that are remaining in the vegetal plate move laterally towards the centre of the plate and fill the gap in the vegetal
Give one example in each case of (a) a fixed joint, (b) a ball and socket joint, (c) a hinge joint. (a) The bones of the skull, the junction of pelvic gi
Which of the following statements is true? Answer Viruses are distinct from cells by the absence of a lipid membrane around them. Viruses are parasites that require the cell's meta
Evaluation This is the last step in nursing process. Throughout care, you constantly evaluate the progress the client has made towards reaching the pre-established goals/ ob
Relation between Tissue and the implant material The biologic interaction between the tissue and the implant material at an interface may result in a variety of phenomena such
In patients with left ventricular failure and reduced ejection fractions, the risk of LV thrombus formation and systemic arterial embolization appears to be primarily in patients
Patients with aborted sudden death, hemodynamically unstable ventricular arrhythmias, and unexplained cardiogenic syncope are at high risk for fatal ventricular arrhythmias. If the
Peculiarities of Mitosis - Cleavage From the following you will learn that the mitosis in the phase of cleavage has some striking peculiarities: a) Synchronization of cell
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