Draw a portion of a plasma membrane of a cell and label the cytoplasmic and extracellular surface. Place the following four proteins in the membrane: a) peripheral membrane protein (cytoplasmic exposure), b) integral protein (transmembrane exposure), c) integral protein (extracellular exposure) and d) peripheral protein (extracellular exposure)

You will find the draw in the attached files.                                       

Explanation:

Transmembrane proteins cross the membrane from side to side. They have three domains in their monoacidic sequences: an extracellular hydrophilic domain, an intracellular hydrophilic domain, and an interior hydrophobic domain. The aminoacidic chain of these molecules might cross the membrane just once or many times, depending on the protein. Transmembrane proteins accomplish many functions, such as substance adhesion, ions interchange, molecules transport, communication, among others.

Proteins encrusted in one of the monolayers do not cross the membrane. Their monoacidic sequences are integrated with only one of the monolayer lipids, hence they have an intramembrane domain and only one extramembrane domain, which might be either cytosolic or extracellular, depending on their position in the membrane.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.