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. | Centriole
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. | Lysosomes
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. | Chloroplasts
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. | Mitochondrion
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. | 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