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• Cancer cells do not respond normally to the body's control mechanism.
o They divide excessively and invade other tissues.o If left unchecked, they can kill the organism.
• Cancer cells do not exhibit contact inhibition
o If cultured, they continue to grow on top of each other when the total area of the petri dish has been covered o They may produce required external growth factor (or override factors) themselves or possess abnormal signal transduction sequences which falsely convey growth signals thereby bypassing normal growth checks.
• Cancer cells exhibit irregular growth sequences
o If growth of cancer cells does cease, it does so at random points of the cell cycle o Cancer cells can go on dividing indefinitely if they are given a continual supply of nutrients o Normal mammalian cells growing in culture only divide 20-50 times before they stop dividing.
Polyembryony Presence of more than one embryo in a seed is termed polyembryony. The phenomenon, first discovered in orange seeds by Leeuwenhoek (1719), attracted considerable
wrt spoilage
E. coli strains containing the plasmid pAMP are resistant to ampicillin. Describe how this plasmid functions to bring about resistance.
10
TRANSPOR T THROUGH P.M. P.M. regulates transport of materials in and outside of cell P.M. is semi- permeable as it allows rapid passage to water molecules. P.M. is selectively
what is genes
Economic Status Economic Status : It is one of the important practical considerations to be kept in mind while formulating a diet prescription. During an acute illness, a
Q. How has the importance of the brain evolved from fishes to reptiles? From the least to the most complex brain structure, it is evident that the brain, from fishes to beings
Why is pH regulation important for living beings? How do mineral salts participate in this regulation? The potential of hydrogen (pH) is a measure of the amount of hydrogen ion
What are the effects of acid precipitation on ecosystems?
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