Defining Life Practice

What do viruses need to reproduce?

• they need genetic material
• They need a host cell
• They need  bacteria
• They need insulin

How does a virus cause a person to develop the common cold?

• invades the host cell to reproduce
• removes energy from the host cell
• produces toxins in the host cell
• protects the host cell from bacteria

When a virus invades a living cell, its _______
takes over the cell's functions.

• outer coat
• genetic material
• core
• cytoplasm

What part of the phage is the DNA?

• A
• B
• C
• D

True or False
The flu is caused by a virus.

• true
• false

Antibiotics kill viruses

• True
• False

What is a pathogen

• Capacity of an organism to defend itself against disease

• Process in which two bacteria of the same species attach to each other and share genetic material

• Agent that causes disease

• Protein that can attach to a pathogen and make it useless

• Breakdown of dead organisms and organic waste

What is a virus

• Strand of DNA or RNA surrounded by a protein layer that can infect and replicate in a host cell

• Change in DNA or RNA

• Agent that causes disease

• Protein that can attach to a pathogen and make it useless

• Mixture containing material from one or more deactivated pathogens

Which is not one of the 6 characteristics of all living things?

• Needs oxygen 
• Grows and Develops
• Reproduces
• Made of Cells

What is the first step of the virus reproduction cycle?

• The viruses genetic material (DNA) starts to take over the functions of the cell
• The host cell bursts open, releasing the new viruses
• The virus injects its genetic material into the cell
• A virus attaches to the surface of a host cell