Download Virus/Bacterial Worksheet

Name
Class
Date
20.1 Viruses
Viruses are particles made up of protein, genetic material, and sometimes lipids. The genetic
material in a virus can be RNA or DNA. The protein coat that surrounds the genetic material is
called the capsid.
Follow the directions.
1. Color the genetic material in each virus blue.
2. Color the protein parts of each virus red.
T4 Bacteriophage
Head
Tobacco Mosaic Virus
Influenza Virus
Capsid
DNA
Capsid
Answer the questions.
1. Where is the genetic material in a T4 bacteriophage located?
2. In general, is the genetic material in a virus inside or outside the protein parts?
3. Why do you think the word virus, based on the Latin word for poison, was used for these
structures?
BUILD Understanding`
Venn Diagram A Venn diagram is made up of overlapping circles. It is a useful tool for
comparing two topics. Put at least 2 things in each section of the diagram. Note: Put things that
both a virus and a cell have in the Both section.
Class
Date
Viral Infections
In a viral infection, a virus enters a cell. It then copies itself and causes the cell to burst.
The flowchart below summarizes what happens in a viral infection.
1. Put the 3 words in the correct blanks to complete the flowchart.
host cell
viral proteins
A
enters or injects
its DNA into a
cell.
The bacterium
then makes
and DNA.
virus
New viruses are
assembled and
burst out of the
.
Answer the questions.
2. What is one result of a viral infection? Circle the correct answer.
destruction of the virus
destruction of the host cell
3. What happens to the viruses after they burst out of the host cell?
BUILD Connections
How a Virus Is Like an Outlaw An analogy compares two things that are different and
shows how they can be similar.
1. How does the analogy of the virus to an outlaw help you
understand viruses? In other words, how are viruses and
outlaws similar?
20.2 Prokaryotes(Bacteria)
A prokaryote is a unicellular organism that lacks a nucleus. Most prokaryotes have a cell wall, a
cell membrane, loose DNA, ribosomes and cytoplasm. The bacterium below is one example of a
prokaryote.
Follow the directions.
1. Color the ribosomes yellow.
2. Leave the cytoplasm white.
3. Color the cell membrane blue.
4. Color the cell wall red.
5. Color the DNA green.
Size, Shape, and Movement Bacteria come in 3 shapes. Shape is one way to tell different
bacteria apart.
The diagram at the right shows several kinds of bacteria.
Follow the directions.
1. Color the bacilli blue.
2. Color the cocci red.
3. Color the spirilla yellow.
Answer the questions.
4. Describe the shape of bacilli.
5. Describe the shape of cocci.
6. Describe the shape of spirilla.
20.3 Bacterial Diseases
Bacteria cause disease in two ways. Some bacteria destroy living cells and the tissues of the
infected organisms. Other bacteria release chemicals that upset homeostasis in an organism.
Decide if the methods listed in the chart below control, prevent, or treat bacterial diseases.
Complete the chart.
Method
Vaccine
Control, Prevent, or Treat?
prevent
Physical Removal
Sterilization
Antibiotics
Disinfection
Read the following scenarios. Decide which method of controlling bacteria is being used.
Circle the correct answer.
1. After cooking raw chicken, Miguel always makes sure to wash his hands.
physical removal
disinfection
food storage
2. Louise always uses a food thermometer to make sure her meat is well cooked.
food storage
food processing
sterilization
3. Andrew works in a lab. He always heats his equipment to a temperature of 100 degrees
Celsius.
physical removal
sterilization
disinfection
4. Marco puts his lunch in the refrigerator at the office instead of leaving it at his desk.
physical removal
food processing
food storage