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Signal transduction occurs when an extracellular signaling molecule activates a cell surface receptor. In words, this receptor change intracellular molecules changes a response. There are two levels in this procedure: the signaling molecule activates a particular receptor protein on the cell membrane. A 2nd messenger transfers the signal into the cell and eliciting a physiological response. In either level the signal can be amplified. Whereas, one signalling molecule can cause several responses. Gene activations and metabolism alterations are instances of cellular responses to extracellular stimulation which requires signal transduction.
Define Nutritional Requirement and Dietary Modifications in the Diet of the Elderlu? The nutritional status influences the age-related rate of functional decline in many organ
Ritonavir (RTV, Norvir) Ritonavir is well absorbed from the gastrointestinal tract and at full doses potently inhibits HIV, but due to poor tolerability it is now used mainly
INTERMEDI A T E FILAMENTS These are non-living structures. Made up of different types of protein eg. Keratin, synemin, desmin and vimentin. These are divided into four
Are the xylem and the phloem made of living cells? The cells that constitute the xylem ducts are dead cells killed by lignin deposition. The cells of the phloem are living
M e rc u r y The metal is biologically non-essential but being used in various industries, it is released in environment from both natural and anthropogenic sources. Man-m
Explain the Nonpolar Molecular Attractions in basic chemistry? Nonpolar Molecular Attractions : Van der Waals forces and hydrophobic interactions are weak (not as strong
Armamentarium 1. Denture duplicator or a modified plastic soapdish. (A plastic large soapdish with a base and cover can be adapted by drilling 2 mm holes interspersed and cover
using examples of invertebrate phyla illustrate how the increase in complexity is reflected by their nervous system?
Define Population size, inbreeding and genetic variation? "Darwin proposed, and modern evolutionary biology affirms, that evolution is relies on variation in the characteristic
1. Describe what effects epigenetic modifications such as methylation and acetylation can have in eukaryotic cells, and how these modifications are added or removed from chromatin.
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