Week7C2 : Taxonomy bacteria

Question 1

Binomial system developed by ____

Answer 1

Carl Linnaeus

Question 2

t or f :Stromatolites gave the earliest conclusive evidence of life on earth.

Answer 2

t

Question 3

what are stromatolites?

Answer 3

Microbial matsconsisting of layers of filamentous prokaryotes, sediments andextracellular matrix.

Question 4

What is the difference between the ancient and modern stromatolites?

Answer 4

ancient are anoxygenic (filamentous bacteria) and modern are oxygenic (cyanobacteria)

Question 5

As early Earth was anoxic, energy-generating metabolism of primitive cells wasexclusively anaerobic and likely ____

Answer 5

chemoautotrophic.

Question 6

if you get a similarity coefficient of ___ the two microorganisms are from the same species.

Answer 6

0.85

Question 7

What did carl woese invented

Answer 7

sequencing small subunit ribosomal RNA (SSU rRNA) for phylogenetic studies of microorganisms

Question 8

What are the steps of rRNA sequencing?

Answer 8

–Amplification of the gene encoding SSU rRNA
–Sequencing of the amplified gene
–Analysis of sequence in reference to other sequences

Question 9

What is the weight of the SSU rRNA of procaryotes?

Answer 9

16s

Question 10

What is the weight of the SSU rRNA of eukaryotes

Answer 10

18s

Question 11

what is the serial endosymbiotic theory

Answer 11

the eukaryotes ancestor diverged from the archae before the engulfing. The later engulfing of a chloroplast by the eukarya gave rise to the ancestor of all plants and photosynthetic eukaryotes.

Question 12

what is the serial hydrogen hypothesis

Answer 12

propose that the eukaryotic
cell evolved from symbiotic relationship between a
bacteria that produce H2 and a archae that consume H2.
This involved over time into the mitochondria. the organelles of eukarya evolved after the establishment of
the endosymbiosis.

Question 13

what is the particularity of the bdellovibrio

Answer 13

this bacteria is a
predator and attacks
other bacteria. They
use the cytoplasm
constituent of their host
has nutrients. The
bdellovibrio penetrates
the cell wall of the prey
and replicates in the
periplasmic space,
eventually forming a
spherical structure
called the bdelloplast

Question 14

Which type of bacteria does bdellovibrio attacks?

Answer 14

gram-

Question 15

what is the particularity of the caulobacter

Answer 15

reproduction cycle with one swarmer daughter cell and a stalked mother cell (unequal binary fission)

Question 16

What is the infectious form of the chlamydia

Answer 16

elementary bodies

Question 17

what are the two cells seen in the life cycle of the chlamydia?

Answer 17

elementary bodies

reticulate body

Question 18

What is the MLST

Answer 18

multilocus sequence typing : method in which several different “housekeeping genes” from a species are
sequenced and aligned to the respective sequences of other individuals of the
same species.

Question 19

Can 16s rRNA method differentiate between strains of a species?

Answer 19

no, but MLST can

Question 20

Name various properties that can help in identification of micoorganisms

Answer 20

–Morphology
–Biochemical properties
–16S rRNA gene sequencing
–MLST

Question 21

the Dichotomous key dfferentiate organisms based on which properties?

Answer 21

(morphology and phenotype)