Chapter 27.3

Question 1

Prokaryotic metabolism

Obligate Aerobes

Answer 1

Obligate aerobes require O2 for cellular respiration

Question 2

Prokaryotic metabolism

Obligate Anaerobes

Answer 2

Obligate anaerobes are poisoned by O2 and use fermentation or anaerobic respiration

Question 3

Prokaryotic metabolism

Faculative Anaerobes

Answer 3

Facultative anaerobes can survive with or without O2

Question 4

Nitrogen Fixation

Answer 4

In nitrogen fixation, some prokaryotes convert atmospheric nitrogen (N2) to ammonia (NH3)

Question 5

Heterocysts

(or heterocytes)

Answer 5

Nitrogen-Fixing cells

In the cyanobacterium Anabaena, photosynthetic cells and heterocysts exchange metabolic products

Question 6

Biofilms

Answer 6

In some prokaryotic species, metabolic cooperation occurs in surface-coating colonies called biofilms