* Channel proteins- these are proteins with a hydrophilic pore where specific ions are able to pass through the membrane. Each channel protein is specific to an ion. This is the only way ions can travel through the membrane. They are trans membrane proteins.
* Carrier proteins- these are proteins which allow larger or polar molecules through the membrane. They are trans membrane proteins.
Carrier proteins essentially “carry" signals that are not soluble in aqueous solution through the blood stream to their target cells. Carrier proteins for hydrophilic signals prevent degradation of the signal. Channel proteins are embedded in cell membranes. They often are receptors (though not always), and when activated, allow specific ions to pass through the membrane.
A channel protein is a special arrangement of amino acids which embeds in the cell membrane, providing a hydrophilic passageway for water and small, polar ions. Like all transport proteins, each channel protein has a size and shape which excludes all but the most specific molecules
The carrier protein facilitate diffusion of molecules across the cell membrane. The protein is imbedded in the cell membrane and covers the entire membrane. This is important because the carrier must transport the molecule in and out of the cell.
B ) As calcium binds with troponin C , it removes the troponin I and open the binding site for myosin head to attach !!
so your answer is B !!
Answer:
At some point the bond between the amino acid and the substrate must break.
Explanation:
Enzymes are the biocatalyst that can increase the speed of the biochemical reactions of the living organisms. All enzymes are made of proteins except ribozymes.
During the catalytic process, the enzymes can form covalent modification. This is only possible when the bonds between the substrate and amino acid is broken. This breaking and formation of bond is important so that enzyme can makes the substrate free and the steps can be repeated again.
