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Bio 1215-chapter 2
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who came up with the
first hierarchical system
?
Linnaeus
degree of relatedness can be estimated by comparing what four things?
anatomy
embryonic or juvenile development
similarity of sequence of DNA/RNA
appearance of novel features
(ex.milk production)
what are the 3 domains of life?
bacteria
archaea
eukarya
what are
viruses
?
microscopic entities
that
attack living cells
Each particle of a virus is called a _______. Describe this particle.
virion
nucleic acid in a protein bag
viruses copy by _________ a living cell
hijacking
what do viruses use to make more virions?
use the
host cell's enzymes and raw materials
virion must bond to _______________ of a host cell. Then the viral nucleic acid enters the host.
surface protein
what 3 things might suggest that viruses are alive?
have protein
carry nucleic acid
use same genetic code as all life
what 2 things suggest that living things are NOT alive?
no metabolism
cannot reproduce independently
viruses probably descended from?
escaped genes
how are prokaryotes considered diverse?
diverse in terms of
metabolism and habitats
what are the 3 general features of bacteria?
lack nucleus
and
membrane-covered organelles
unicellular but may form
clonal colonies
or
biofilms
what is an example of a prokaryote?
bacteria
what is the advantage of bacteria having lots of membrane?
more membrane means there is
more surface area to undergo reactions
such as photosynthesis and cellular respiration
Bacteria cell walls contain ____________. Describe it.
peptidoglycans
combinations of
sugar and peptides
describe gram-positive bacteria.
have
many peptidoglycans
(purple)
describe gram-negative bacteria.(2)
have
few peptidoglycans
(pink)
have a
second outer membrane
what are the 3 bacteria cell shapes?
spheres (cocci)
rods (bacilli)
corkscrews (spirilla)
Many bacteria also secrete an outer, sticky capsule, for what function?
for
adhesion and protection
Bacteria cells may have hairlike extensions, for what function?
fasten to host and attach for conjugation.
what are 3 ways bacteria are motile?
flagella
slime gliding
spinning helical filaments
what is the term used for the movement towards or away from certain stimuli?
taxis
what are chemotaxis and phototaxis?
chemotaxis
: movement to and from chemicals
phototaxis
: movement to and from light
Most DNA of bacteria are in one ring-shaped chromosome. They may also contain smaller rings of DNA called?
plasmids
Describe plasmids.(3)
replicate independently
can be transferred/traded between cells
genes are not essential but may be useful in certain conditions
(antibiotic resistance)
Bacteria reproduce via___________ or some produce dormant _______________.
Binary fission
resistant endospores
what are the 3 ways that bacteria reproduce?
transformation
: taking in
external DNA from the surroundings
conjugation
: a
direct transfer of DNA from once cell to another
transduction
:
accidental transfer by viruses
what are the 5 main groups of bacteria?
cyanobacteria
proteobacteria
chlamydia
spirochetes
gram-positive bacteria
Describe 2 things about cyanobacteria.
photosynthetic
capable of fixing nitrogen
Describe 2 things about proteobacteria. Give an example.
gram-negative
eg. salmonella
i
ncludes facultative anaerobes
eg. E.Coli
Describe 2 things about chlamydia.
intracellular animal parasites
can cause STD and blindness
Describe 2 things about spirochetes.
corkscrew-like movements,
eat dead stuff or are parasites
Describe a thing about gram-positive bacteria.
mostly harmless
but includes causes of
tuberculosis, leprosy, and botulism
Describe 4 things about archaea.
look like bacteria but are closely related to eukaryotes
no peptidoglycans in cell wall
unique lipids in membrane
many live in anaerobic or extreme environments (extremophiles)
what are the difference between thermophiles and halophiles?
thermophiles
: live in hot water
halophiles
: live in very salty water
Prokaryotes "invented" most ________________.
metabolic pathways
what are 5 things that show the "importance" of prokaryotes?
cycle of chemicals
many
symbiotic relationships with other species
some of the
toxins produced
by some species are
used for antibiotics
genetically-engineered bacteria used to produce insulin
+ other drugs
help
produce yogurt and cheese
what is an example of how prokaryotes cycle chemicals? what are they useful for?
photosynthetic cyanobacteria that 'fix" carb
on (construct organic molecules from CO2); only nitrogen fixers
useful for sewage plants; oil spill clean ups
how can some prokaryotes cause many diseases? (2)
some through
growth and invasion
some
produce toxins
Author
CanuckGirl
ID
256916
Card Set
Bio 1215-chapter 2
Description
An overview of life's diversity
Updated
1/18/2014, 5:49:47 AM
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