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41 Cards in this Set

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Characteristics of bacteria
smallest, simplest, most abundant organism on planet
moves, eats, reproduces: carries out life functuions
live almost everywhere
Prokaryotic cell: no nucleus and no membrane-bound organelles,has ribosomes, some have chloroplasts (producers)
live alone or in groups called colonies
aerobic
needs oxygen
anaerobic
doesn't need oxygen
ways bacteria are helpful
Vitamin K: helps blood clot
Antibiotics: kill bacteria
Digestion
fuel: methane-producing bacteria
insulin: helps people with diabetes
Food:Many foods are made w/ bacteria
Oxygen: produced as a waste product
Vaccines: help our body prepare to fight diseases
nitrogen-fixing bacteria
plants need nitrogen to grow, and bacteria supplies the nitrogen.
how some bacteria can cause human disease
by producing toxins (poisonous substances)
bacteria
smallest living organism, microscopic
Unicellular
one-celled organism
prokariotic
no nucleus, simple structures, no organelles except ribosomes
consumer
cannot produce its own food
Flagella
whiplike tails that help bacteria move
fission
asexual form of bacterial reproduction
antibiotics
kill bacteria
pathogen
anything that causes disease
parasite
invades the bodyof another organism to take its nutrients
Flagella
whiplike tails that help bacteria move
fission
asexual form of bacterial reproduction
antibiotics
kill bacteria
pathogen
anything that causes disease
parasite
invades the bodyof another organism to take its nutrients
toxins
poisonous substances
vaccines
prevent some diseases caused by bacteria
Bacilli
rod-shaped bacteria
Cocci
sphere-shaped bacteria
Spirilla
spiral-shaped bacteria
Binary Fission
simplest form of asexual reproduction
- simple cell division -- 1 cell splits into 2 identical cells
-results in new cell with same DNA
4 steps of Binary Fission
1. cell grows
2. DNA copies itself
3. Cell begins to split & DNA moves to side
4. 2 identical cells
Producer Bacteria
make their own food
contain clorophyll

example: cyanobacteria
Consumer Bacteria
have to get food by being parasite or decomposer
Decomposer Bacteria
break down dead or decaying organisms
Parasitic Bacteria
go into body of host and take host's nutrients
Eubacteria
Ex. Cyanobacteria (producer Eubacteria)
produce oxygen as waste product
important food source for other organisms
Archaebacteria
Bacteria that live in extreme conditions (produce methane)
Too many Eubacteria
cause too much to bloom
What do good bacteria do for the environment?
Bioremediation - change pollutants into harmless compounds
Recycling Bacteria - decomposers - decompose dead or decaying organic matter and creates nutrients for the earth
Pathogens enter body
inhale, eat or through cut or scab
Bad bacteria can cause
Lyme disease, cavities, strep throat, food poisoning, pneumonia
Pathogens make you sick by:
producing toxins
Pasteurization
invented by Louis Pasteur
Heat food to a temperature that kills most of the harmful bacteria but doesn't change the taste much
Treatment of bacterial diseases
Vaccines - prevent some diseases
- made from damaged bacteria cell parts or dead bacteria
- once enters your body, makes white blood cells recognize the bacteria as "bad", when bacteria enters the body, white blood cells will attack
nodules
growths on roots of plants where nitrogen fixing bacteria live