Ch 27

Question 1

Prok cell walls

Answer 1

Maintain shape
Protect
Prevent bursting in hypotonic enviro

Question 2

Archea

Answer 2

Asexual reproduction
Single circular dna
RNA and ribo protein more like euk than eubact
Common ancestor w euk
Plasma memb tolerates low pH and high heat

Question 3

3 archea groups

Answer 3

Methanogens-use H2 to turn co2->ch4 strict anaerobics

Extreme halophile- high salinity(15-20%)

Extreme thermophiles-live in 60-80 C

Question 4

Domain Bacteria eubacteria

Answer 4

Has forms of every mode nutrition

Single celled

Question 5

Gram +

Answer 5

Thick layer petidoglycan outside plasma membrane

Question 6

Gram -

Answer 6

Outer bilious membrane thin petidoglycan thin plasma membrane

Question 7

Eubacteria shapes

Answer 7

Spheres (cocci)
Rods(bacilli)
Helices(spirilla)

Question 8

Taxis

Answer 8

Directed movement to away from stimulus

Photo taxis etc
Pos=towards

Question 9

Prok flagella

Answer 9

Solid protein
Oar not whip
Powered by proton diffusion

Question 10

Bacterial structures

Answer 10

Pili-long appendages for DNA transfer

Frimbrae-short number out appendage for sticking

Capsule-gelatinous secretion proving adhesion and hydration

Question 11

Prok impact on earth

Answer 11

Very few cause disease
Fixers/decomps essential in geo Chem cycles
Symbiotic w other prok and euk
M/c and chloroplasts may have descended from symb bact