Chapter 27 and 28 Review

1
Chapter 27 and 28 Review

• Viruses and Prokaryotes

2
Chapter 27 review questions

• T/F Viruses are living organisms.
• Viruses are classified by their genomes- What are
  the different classes?
• What is the name of the structure that surrounds
  their nucleic acid core?
• The virus that calls chicken pox is Varicella
  zoster. If you had chicken pox as a kid, and then
  later get shingles as an adult. What do we call
  the period in which the virus is dormant?

3
Chapter 27

• Name and describe the 2 virus shapes.
• What are viruses called that infect bacteria?
• What is the difference between the lytic and
  lysogenic cycle?
• Explain the HIV infection cycle. Look at the
  following website http//www.cellsalive.com/hiv3.
  htm
• T/F Viruses contribute to 15 of all human
  cancers.
• What are emerging virues?
• What are prions?
• What are viroids?

4
Chapter 28 review questions

• What are microfossils?
• What are the 2 domains of bacteria?
• What are the differences between prokaryotes and
  eukaryotes? 1.)
• What are the differences between Eubacteria and
  Archaea?
• T/F All prokaryotes have been named and
  described.
• Compare and contrast the early classification
  characteristics used to classify prokaryotes vs.
  the molecular approaches used today.

5
Chapter 28

• What are the basic bacterial shapes?
• Explain the gram-staining procedure.
• What is the gelantinous layer that surrounds the
  outer cell wall in some prokaryotes?
• T/F Pili are hairlike structures that occur on
  the cells of gram-positive bacteria
• T/F Bacteria that cause tetanus, botulism, and
  anthrax employ the use of endospores- a structure
  that is resistant to environmental stress and can
  lay dormant until favorable conditions exist.
• T/F Prokaryotes have nuclei and linear
  chromosomes.
• T/F Prokaryotes reproduce sexually.
• What are the four mechanisms that DNA is
  exchanged horizontally in Prokaryotes
• Explain what photoautotrophs, chemolithoautrotroph
  s, photoheterotrophs, and chemoheterotrophs are.
• T/F All prokaryotes are harmful.