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Explain the Classification of Malignant Tumors
Malignant tumors can be classified as:
Carcinomas: These tumors arise from the epithelial lining (the squamous cells) e.g. skin, tongue, breast, stomach, large intestine (the latter three arise from the glandular tissues).
Sarcomas: these arise from the connective tissue e.g. bone, cartilage and fat.
Melanoma: arise from pigmented layers of skin e.g. pigmented moles.
Gliomas: these arise from the central nervous system e.g. brain and spinal cord.
Reticulo -endothelial tumors: these involve the lymphatic system.
Adenoma: the growth arises from a gland e.g. thyroid gland.
What bacterial cell structures are used to carry the genes intended for genetic engineering? The cells structures in bacteria which carry genes intended for genetic engineering
STRUCTUR E OF A MYOFIBRIL - The dark bands of the myofibril are termed the A-bands (Anisotropic bands). Each A-band has at its middle a light zone called H-zone (Henson'
Coding sequence is the portion of the gene or the mRNA which actually codes for a protein. Introns are not coding for the sequences; nor are the 5' or 3' untranslated regions (or
Biochemical Changes Associated with Senescence When senescence begins many physiological and biochemical changes take place. For example, one of the important changes observed
Explain about thiol proteases Group of thiol proteases, similar in structure to each other, are found in plants. These include papain from the papaya fruit and ficain from f
Germplasm Conservation - plant tissue and organ culture Totipotent plant cells and shoot tips can be freeze-preserved in liquid nitrogen (-196? C) for long periods, and wh
An electronic chip is to be implanted in the body. During in vitro (in the lab) testing it is observed that the chip will dissolve over time if exposed to liquid with similar pH to
Give an example of how two organisms are interdependent.
State Bioinert materials Bioinert materials are chemically inert in the body and exhibit minimal chemical interaction with adjacent tissue such as titanium and alumina (Al 2 O
Q. Which animals make tracheal respiration? Is there a blood-like fluid that participates in this process? Arachnids and Insects are the arthropod animals that make tracheal re
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