In the Windows operating system, IO.SYS is an executable binary file (in other words, a program) that, when the operating system is booted (started), processes instructions that tell the operating ...
An antiport is an integral membrane transport protein that simutaneously transports two different molecules, in opposite directions, across the membrane.The example below depicts the process by which HCl is secreted into the lumen on the stomach.n antiport is an integral membrane transport protein that simutaneously transports two different molecules, in opposite directions, across the membrane.
Antifolates are drugs that antagonise (that is, block) the actions of folic acid (vitamin B9). Folic acid's primary function in the body is as a cofactor to various methyltransferases involved in serine, methionine, thymidine and purine biosynthesis. Consequently antifolates inhibit cell division, DNA/RNA synthesis and repair and protein synthesis.