Characteristics of Viruses and Organisms

After learning about viruses in Biology class, Sam decides to have his cat vaccinated against feline leukemia virus.
According to cell theory, are viruses, such as feline leukemia, considered living things?

• Yes, because they can reproduce
• Yes, because they are composed of cells
• No, because they cannot adapt to their environment
• No, because they are not composed of cells.

Tags

NGSS.MS-LS1-1

Viruses are intracellular obligate parasites, which means that they cannot reproduce or express their genes without…

• Enzymes 
• A Host Cell 
• Another Virus 
• A Cell Wal

Which of the following is NOT a characteristic of all living things

• Growth & Development
• Ability to Reproduce 
• Ability to Move  
• Response to the Environmnet

Tags

NGSS.HS-LS1-3

NGSS.HS-LS1-4

The protein coat that envelopes the viral genetic material is known as a __________.

• Viron
• Case
• Viroid
• Capsid

What is a virus that infects a bacterium called?

• Virophage
• Bacteriophage
• T Cell 
• B C

Viruses have structures that allow them to inject their genetic material directly into the DNA of the host cell. This strategy benefits the virus in that –

• the host cell is turned into a virus.

• mutations are introduced into the host cell.

• it is able to transform into a host cell.

• the virus uses the host’s machinery to replicate.

Tags

NGSS.MS-LS3-1

Viruses use two different cycles of replication, the lytic cycle and the lysogenic cycle. In what way is the lysogenic cycle different from the lytic cycle?

• The virus recognizes and attaches to host cell.

• The host cell is not destroyed immediately.

• Viral DNA is replicated along with host DNA.

• The virus injects its DNA into the host cell..

A bacteriophage is a type of virus that infects only a bacterial host cell. A bacteriophage can’t cause disease in humans because it –

• does not have the correct surface proteins.

• can only use bacterial DNA to replicate.

• gets destroyed in the human digestive tract.

• is able to reproduce without a host cell.

A bacteriophage virus causes infection in bacteria by injecting which of the following?

• DNA

• Hormones

• Proteins

• Lipids

Which of the following characteristics is shared by viruses and living cells? Both viruses and living cells –

• have a nucleus, as well as a cell wall.

• contain nucleic acids such as DNA or RNA.

• can replicate independently of a host cell.

• use organelles to perform life functions.