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Bio103

Unit 24 & 25

pathogens infective microorganism agents such as viruses, bacteria, and protozoa that cause disease
What is the core of the virus and what is it dependent on? -core= nucleic acid -dependent on a living host
Why are viruses considered as nonliving particles? 1. they're not composed of cells 2. they cannot carry out metabolic activities 3. cannot reproduce
capsid a protein coat that surrounds the core of a virus
Bacteriophages infect ___ bacteria
What are the 2 types of of reproductive cycles observed among viruses? -lytic- causes disease and death -lysogenic
What are the 5 steps that are typical of LYTIC viral reproduction? 1. attachment 2. penetration (penetrates membrane) 3. replication 4. assembly (viruses put together) 5. release
temperate viruses viruses that do NOT always destroy the host cell -alternates between a lytic and lysogenic cycle
viral lysogeny occurs when bacteria exhibit new properties as a result of integration of temperate viral DNA
retroviruses RNA viruses, transcribes their DNA genome into a DNA strand that is then used as a template to produce more viral RNA ex: HIV
Spherical prokaryotes are called __ cocci
1. paired cocci= 2. chained cocci= 3. clumped or bunched cocci= 1. dipilcocci 2. streptococci 3. straphylococci
bacilli rod- shaped prokaroyotes
3 different types of reproduction in prokaryotes 1. binary fusion (most common)- divides 2. budding 3. fragmentation
3 types of symbiotic relationships that can be observed when prokaryotes interact 1. mutualism 2. commensalism 3. parasitism
mutualism when both partners benefit
commensalism one partner benefits and other is neither harmed or helped
parasitism one benefits and the other is harmed in a way
endospores dormant durable cells that bacteria formed due to unfavorable environment conditions
Created by: lacim05
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