The cell membrane separates the intracellular environment from the extracellular environment outside of the cell. A phospholipid is composed of a phosphate group and a lipid. It is composed of a hydrophilic, polar phosphate head and two hydrophobic fatty acid tails.
The structure of the bilayer is such that the tails are shielded from contact with water, creating a selectively-permeable barrier which will be impermeable to most hydrophilic molecules.
So, the answer is A) To maintain balance of water and nutrients in the cell.
The answer is DNA replication
Hox genes, which are members of the homeotic transcription factor family, establish the segment identity of tissues within the embryo and are essential regulators of the body plan along the cranio-caudal axis (also known as the anterior-posterior axis). This means during embryogenesis, these genes expression follows a precise spatial and temporal colinearity pattern from the 3' to the 5' end of each cluster.
This indicates that Hox genes expressed anteriorly in the developing embryo are typically found at the 5′ end of the same genomic area, a phenomenon known as spatial colinearity. In comparison, those expressed posteriorly are typically found at the 3′ end of the Hox cluster.
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As altitude increase the air pressure decreases
Epinephrine generates the separation of the G protein linked receptor and it activates the G protein to trigger proper cellular signaling.
<h3>What is Epinephrine?</h3>
Epinephrine is a key chemical messenger (i.e. a hormone) that binds to suitable ligands in the cell membrane.
Upon Epinephrine binding, G-protein is activated to produce a molecular cascade and triggers a cell signaling inside the cell.
In conclusion, Epinephrine generates the separation of the G protein linked receptor and it activates the G protein to trigger proper cellular signaling.
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