Biology Chapter 20 Vocabulary
Terms in this set (30)
-not cells; great variety of shapes
-smaller than prokaryotes
-composed of nucleic acids DNA and RNA in a protein coat called the capsid
- they are PATHOGENS that cause disease
- they are specific to their hosts
Virus enters the host cell, reproduces new viruses, and bursts out to infect new cells
virus enters the host cell, the viral genes incorperate their DNA into the host's DNA called the PROVIRUS. Whenever the host cell reproduces, the provirus is reproduced. During this cycle, NO HARM is done to the host. When oppurtunistic conditionsarise, the virus will move into the lytic cycle. EX. herpes virus
reappear or spread to new areas EX. West Nile Virus, Swine Flu
has capsid but no nucleic acid EX. Mad Cow disease
has RNA but no capsid; they often infect plants
-not living like cells
-lack nucleus and membrane bound organelles like mitochondria
-unicellular with free floating DNA
-reproduce by binary fussion
-some have sexual pili to transmit genetic info before they divide
-can be aerobic or anaerobic (NO AIR)
-most are heterophobic (such as decomposers
-have cell walls
-some have capsules OUTSIDE of cell wall
- soem have endosheres to protect themselves during tough conditions
3 Shapes of Bacteria
Rods (bacillus), Round (coccus), Spiral (spirillium)
(disease causing) bacteria can make the host feel ill by feeding on its resources. EX. tuberculolus, acne.
-Bacteria can also produce TOXINS (poison substance) EX. Staph Infections, BOTULISM
the deliberate exposure to viruses, bacteria, or their toxins.
fight many bacterial diseases.
if antibiotics end prematurely the bacteria may not all be killed and they can mutate to become resistant to the drug.
Importance of Bacteria
used in food production, fermenting, medecines, mining, and clean up of oil spills
agents that cause disease
may contain RNA or DNA
proteins with attached carbohydrate molecules
viruses that infect bacteria
outside the cell wall and cell membrane, many bacteria have this gel-like layer
process in which two organisms exchange genetic material
describes a process that does not require oxygen
process that requires oxygen
encloses the genetic info of a virus
DNA and RNA
2 types of genetic info in a virus
cant not make its own food (HUMANS)
can make its own food
Breach or Rift
How does a virus enter a plant?
What causes HIV?
bacterias pili exchange info