Monday, September 5, 2011

Lysosomes- om nom nom

Lysosomes are the digestive tract of the cell...
Where it is found: in the cytoplasm of the cell

What it looks like: a membrane enclosed bubble of proteins and enzymes, almost like a mini-cell


What it does: degrades material taken in from outside the cell and digest parts of the cell itself, basically the garbage disposal

Where I got this info...

Golgi Apparatus

Where it's found: close to the cell nucleus
What it looks like: a stack of deflated balloons, made of stacks of membrane-covered stacks called cisternae 
What it does: processes proteins from the endoplasmic reticulum, form carbohydrates, sulfate groups are added to proteins, nucleotide sugars are imported in from the cytoplasm to carry out thglycosylation and phosphorylation processes 


Rough Endoplasmic Reticulum

The rough endoplasmic reticulum is involved in synthesizing proteins from the ribosomes attached to its surface.
Where is it: attached to the nuclear envelope, next to the smooth endoplasmic reticulum
What it looks like: once again, is a conglomerate of membrane, tubules, and sacs, and, most importantly, is studded with ribosomes


What it does: assembles proteins from the cytoplasm, folding of proteins, quality control of folded proteins, transfers proteins to the Golgi Apparatus

Smooth Endoplasmic Reticulum

The smooth endoplasmic reticulum is important in many functions in the cell.
Where it is: connected to the nuclear envelope in plant and animal cells

What it looks like: a network of membranes, tubules, and sacs













What it does: carbohydrate metabolism, regulation of calcium ions (used in muscle contraction), synthesizing steroids and lipids, and drug detoxification; transportation of synthesized proteins

Here's where I got this info...

Ribosomes

Ribosomes are essential in cells. They are in charge of protein assembly.
Where it's found: suspended in the cytoplasm or attached to the endoplasmic reticulum

What it looks like: made of two sub units, making it look like a bumpy sphere

What it does: Ribosomes make proteins out of RNA either in the cytoplasm or attached to the endoplasmic reticulum

The Manufacturer- the Nucleolus

The Nucleolus makes some pretty important proteins called ribosomes. Here's some more on the manufacturer:
Where it's found: in the nucleus, but it is not bound by a membrane
                              What it looks like:
What it does: assembles ribosomal units and ships them out of the nucleus, so it is indirectly involved in protein synthesis

Here's where I got this info

The Center of Command- The Nucleus

The nucleus is the head honcho of the cell, and probably one of the best known organelles. Let's take a closer look at the CEO of the cell...
Where it's found: enclosed by a membrane in the cytoplasm of a cell [eukaryotic cells ONLY]

What it looks like: a nucleus doesn't have a defined shape, but it is usually spherical in shape; it has a double layered membrane called the nuclear membrane 


What it does: the nucleus is in charge of the cell. It contains the DNA of the organism, is where DNA transcription (when mRNA is produced) takes place, makes sure that the daughter cells have the correct amount of DNA and are replicated correctly. The nucleus is considered the 'control center' of a cell for this reason.


Here's where I got this info