Name _________________________________                Date _________________________                Per. ______


The Virtual Cell Worksheet


1.  Centrioles are only found in __________________ cells.  They function in cell _____________________.  They have _____ groups of _____ arrangement of the protein fibers.  Draw a picture of a centriole in the box.



2.  Lysosomes are called ______________________ sacks. They are produced by the ________________ body. They consist of a single membrane surrounding powerful _______________ enzymes. Those lumpy brown structures are digestive _____________.  They help protect you by __________________ the bacteria that your white blood cells engulf.  _______________ act as a clean up crew for the cell.   Zoom in and draw what you see.



3.  Chloroplasts are the site of ______________________.  They consists of a __________ membrane. The stacks of disk like structures are called the ______________. The membranes connecting them are the _________________  membranes.   Zoom in and draw a picture.



4.  Mitochondrion is the _______________________ of the cell.  It is the site of _______________________.  It has a ____________________ membrane.  The inner membrane is where most _______________ respiration occurs.  The inner membranes is __________ with a very large surface area. These ruffles are called ___________.  Mitochondria have their own ________ and manufacture some of their own _______________.  Draw a picture of the mitochondrion with its membrane cut. 



5.  Endoplasmic Reticulum (ER) is a series of double membranes that ________ back and forth between the cell membrane and the _______________.  These membranes fill the ____________________ but you cannot see them because they are very ___________________. The rough E.R. has __________________________ attached to it. This gives it its texture. These ribosomes manufacture __________________________ for the cell.  The ribosomes are the ______________________________ which manufacture proteins.  Draw the rough ER with a ribosome.


Endoplasmic Reticulum (ER)

6.  Smooth E.R. ____________ ribosomes. It acts as a __________________________ throughout the cytoplasm. It runs from the cell membrane to the nuclear ________________ and throughout the rest of the cell.  It also produces ___________________ for the cell. Draw a picture of the smooth ER.


Smooth ER

7.  Cell Membrane performs a number of critical functions for the ________.  It regulates all that _____________ and leaves the cell; in multicellular organisms it allows _________ recognition.  Draw and shade the cell membrane.


Cell Membrane

8.  Nucleus is called the ______________________ of the cell. It is a large __________ spot in eukaryotic cells. It _________________ all cell activity.  The nuclear membrane has many ____________________.  The thick ropy strands are the _____________________________. The large solid spot is the _____________________.  The nucleolus is a spot of __________________ chromatin.  It manufactures __________________________.  The chromatin is _______________ in its active form. It is a __________________________________ of DNA and histone proteins. It stores the information needed for the manufacture of ____________________.  Draw a picture of the nucleus and its nucleolus.



9.  Golgi Body is responsible for packaging _________________________ for the cell.  Once the proteins are produced by the ______________ E.R., they pass into the _______________ like cisternae that are the main part of the Golgi body.  These proteins are then squeezed off into the little _________________ which drift off into the cytoplasm.  Draw a picture of the Golgi Body as it is squeezing off the proteins.

Golgi Body

S. Spiegle       9/2000