White blood cells, or leukocytes, contain the same organelles as eukaryotic cells, such as the Golgi apparatus, mitochondria, a nucleus and nucleolus, centrioles, rough endoplasmic reticulum, smooth endoplasmic reticulum and peroxisomes.

The white blood cell has a rough endoplasmic reticulum because it needs to transport proteins. They would have 1 because they most cells only have 1. They also make lysosomes and store proteins. There would be a Golgi apparatus in a white blood cell because they make lysosomes and store proteins.

Cells that specialize in protein secretion contain large amounts of rough endoplasmic reticulum. For instance, cells of the pancreas that produce the protein insulin, have abundant rough endoplasmic reticulum.

Its main functions are the synthesis of lipids, steroid hormones, the detoxification of harmful metabolic byproducts and the storage and metabolism of calcium ions within the cell. The smooth ER is distinguished from the other parts of the endoplasmic reticulum by the absence of membrane-bound ribosomes.

RER stands for rough endoplasmic reticulum. SER stands for smooth endoplasmic reticulum.

ER is usually divided into rough (RER) and smooth (SER) by the presence or absence of membrane bound ribosomes on the external surface that are engaged in protein synthesis.

Ribosomes have two main functions — decoding the message and the formation of peptide bonds. These two activities reside in two large ribonucleoprotein particles (RNPs) of unequal size, the ribosomal subunits. Each subunit is made of one or more ribosomal RNAs (rRNAs) and many ribosomal proteins (r-proteins).

How to Draw ER Diagrams

1. Identify all the entities in the system. An entity should appear only once in a particular diagram.
2. Identify relationships between entities. Connect them using a line and add a diamond in the middle describing the relationship.
3. Add attributes for entities.