Understanding Viruses and Bacteria

Which of the following best describes why viruses require a host cell?

• Viruses can produce their own energy.

• Viruses depend on a host for metabolic processes.

• Viruses have their own cellular organelles.

• Viruses can reproduce independently.

Tags

VA.BIO.4.a.

Which structure is found in bacteria but not in viruses?

• Protein coat

• Nucleic acid

• Cell wall

• Envelope

Tags

VA.BIO.4.c.

What role do bacteria play in the environment?

• They only cause diseases.

• They help decompose organic matter.

• They only live in extreme environments.

• They are only found in the human body.

Tags

VA.BIO.4.d.

A student observes that viruses cannot reproduce outside a host cell. What concept does this observation support?

• Viruses are living organisms.

• Viruses depend on a host for metabolic processes.

• Viruses can perform photosynthesis.

• Viruses have their own metabolism.

Tags

VA.BIO.4.a.

Compare the lytic and lysogenic cycles of viral replication. Which statement is correct?

• Both cycles immediately destroy the host cell.

• The lytic cycle results in immediate destruction of the host cell, while the lysogenic cycle allows the viral DNA to integrate into the host genome.

• The lysogenic cycle does not involve viral DNA.

• Both cycles do not require a host cell.

Tags

VA.BIO.4.b.

How do the structures of bacteria and viruses differ in terms of genetic material?

• Both have circular DNA.

• Bacteria have DNA in a nucleoid region, while viruses may have DNA or RNA enclosed in a protein coat.

• Both have a nucleus.

• Viruses have mitochondria to store genetic material.

Tags

VA.BIO.4.c.

A scientist conducts an experiment showing that washing hands reduces the spread of disease. How does this support the germ theory of infectious disease?

• It shows that diseases are caused by bad air.

• It provides evidence that microorganisms cause disease and can be controlled by hygiene.

• It proves that all diseases are genetic.

• It shows that viruses are not harmful.

Tags

VA.BIO.4.e.

Use the image to answer the question

• A

• B

• C

• D

Tags

NGSS.MS-LS1-3

NGSS.MS-LS1-5

Which statement about bacteria is true?

• Bacteria help you breath
• Bacteria help you digest your food
• Bacteria help add carbon dioxide to the atmosphere
• All bacteria need sunlight to make food

Warm up: Categorize the characteristics of Viruses and Bacteria

Groups:

(a) Viruses

,

(b) Bacteria

,

(c) Both

• Has a cell membrane and walls

• Does not have cytoplasm

• Living

• Mostly harmless to humans

• Needs host cell to reproduce

• Has cytoplasm

• Has DNA

• Responds to antibiotics

• Can cause disease

• Doesn't respond to antibiotics

• Causes the plague

• Causes COVID