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What is Intercellular Communication explain briefly?
Both plant and animal cells have developed means of communication between cells. In animals, specialized areas of the cell membrane called gap junctions are sites of transfer of material between cells. Tight junctions close off intracellular spaces by gluing together ajoining cells so as to not allow material to pass between them. Desmosomes are very strong junctions associated with cytoplasmic structural filaments, present in skin and other tissues subject to mechanical stress. Desomosomes are thought to have a supportive role.
Plant cell walls have pores called plasmodesmata that allow fusion of the plasma membranes of two adjoining cells.
Evolution of Photosynthesis and Aerobic Respiration It is assumed that the earlier form of the bacteria utilised H 2 S for the preparation of food. The following reaction shows
A saline drip is to be prepared for a lab experiment that is looking at hydration in lab rats. Calculate the amount of NaCl need to make 4 liters of a 0.9% solution.
Consequences of Air Pollution The physiological effects of toxic pollutants on living beings can be of two types: Acute effects and Chronic effects. Acute effec
Effects of malnutrition The effects of malnutrition are not the same in adults and children. When the amount of food is not sufficient or when the nutrients are missing f
Define Bioavailability of pyridoxine? A recent review by Gregory confirms that bioavailability of vitamin B 6 in a mixed diet is about 7570, with approximately 8% of this tot
In 1798, British economist and demographer Thomas Robert Malthus, published his' essay on population' in which he stated that: 1. Population increases in a geometric rat
Treatment Most cases of diarrhoea do not need antibiotic therapy as the bacterial or parasitic organism are not isolated from most of the cases. However chemotherapeutics ar
What is meant by saying that in relation to a given trait conditioned by a gene with two different alleles the gametes are always "pure"? To say that gametes are pure means tha
TYPES OF REGENERATION - R eparative R estorative 1. It is limited to healing of wounds or replacement of cells It can replace
(a) Hormones of the Anterior lobe - The anteriorIobe of the pituitary gland secretes the following hormones, most of them are trophic hormones. (i ) Somatotropic hormone o
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