In order to cross the hydrophobic interior of the bilayer, water-soluble molecules (those that are either charged or have polar groups) and large molecules require the action of membrane transport proteins. These integral membrane proteins provide a continuous protein-lined pathway through the bilayer.
Directory. A directory is a location for storing files on your computer. Directories are found in a hierarchical file system, such as DOS, OS/2, Unix, etc. When referring to a directory, a user commonly indicates the name of the directory.owever, a directory and folder are synonymous. Below is an example of what a directory path would look like in MS-DOS. In the above example, C: is the drive letter and the current directory is System32, which is a subdirectory of the Windows directory.
A directory or folder is nothing more than a location on a disk used for storing information about files. With DOS 2.x, IBM/Microsoft introduced multiple directories on a single disk. In effect, this let you sort your files into groups and place each related group into its own directory.f, instead of data, you created a file that pointed to other files on the disk, you will have built what amounts to a subdirectory. If you look at a complete file name you see something like: C:\Program Files\Database\DBASE.EXE (or whatever). The root directory is the C:\ part.