Puttoff Lecture LOs 9-10

Question 1

3 Oxygen using enzymes

Answer 1

1) Catalase
2) Peroxidase
3) superoxide dismutase

Question 2

Catalase

Answer 2

2H202–> 2H20 + O2

Question 3

Peroxidase

Answer 3

breaks down hydrogen peroxide

Question 4

Superoxide Dismutase

Answer 4

O2(-) + O2(-) + 2H –> H2O2 + 02

Question 5

Obligate aerobes possess what oxygen enzymes?

Answer 5

All of the above, plus all the ones involved in krebs and the ETC

Question 6

Facultative anaerobes possess what oxygen enzymes ?

Answer 6

have catalase and superoxide dismutase

use fermentation when oxygen isn’t present

Question 7

Microaerophilic bacteria

Answer 7

also called aerotolerant anaerobes

use fermentation because they dont use an electron transport chain, but tolerate oxygen because they have superoxide dismutase but NO catalase

Question 8

Obligate anaerobes

Answer 8

hate oxygen, die in its presence

Question 9

all medically improtant bacteria are classified as

Answer 9

chemoheterotrophs

they use both chemical compounds and organic compounds like glucose

Question 10

How do medically important bacteria utilize oxygen?

Answer 10

oxygen metabolism is utilized by fermentation (glycolysis) and for facultative anaerobes and obligate anaerobes, respiration (Krebs and a coupled electron transport system)

Question 11

How do obligate intracellular organisms acquire their energy source if they dont utilize glycolysis or respiration?

Answer 11

they have to steal ATP from their hosts

two examples: chlamydia and Rickettsia