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biochemistry mcq questions

1-  What is the reason of sickle cell anemia? A.         substitution of Val with Glu in beta-chain of hemoglobin B.       substitution of Lent with ILe in beta-chain of hemoglobin C.          substitution of Glu with Val in beta-chain of hemoglobin D.         substitution of Phe with Gln in beta-chain of hemoglobin 2- what is not correct answer for hemoglobin and myoglobin ? A.       myoglobin has low affinity to oxygen than hemoglobin B.       myoglobin has one site to bind oxygen C.       Low pH decrece the affinity of hemoglobin to oxygen D.       myoglobin  has one polipeptide chain 3- alanin is similar to serine in the same way that ? A.       Val is similar to thr B.    ...
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Autonomic Nervous System

Autonomic Nervous System                                                                                                                                                                   ...
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Neoplasia

Definition of Neoplasia Neoplasia is new, uncontrolled growth of cells that is not under physiologic control. A "tumor" or "mass lesion" is simply a "growth" or "enlargement" which may not be neoplastic (such as a granuloma). The term "cancer" implies malignancy, but neoplasms can be subclassified as either benign or malignant. There is no single mechanism by which a neoplasm arises. Many different mechanisms give rise to neoplasms, and that is what makes diagnosis and treatment so challenging. Nomenclature of Neoplasia Based upon origin: Malignant neoplasms arising from tissue embryologically derived from ectoderm or endoderm are usually carcinomas. Examples include: Squamous cell carcinoma of cervix Adenocarcinoma of stomach Hepatocellular carcinoma Renal cell carcinoma Malignancies arising from mesoderm (connective tissues) are usually sarcomas. Examples include: Leiomyosarcoma Chondrosarcoma Osteosarcoma Liposarcoma N...
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