BIOL 3332 Micro Biology Exam Combined. Complete With Answers

Your answer is CORRECT.
Organotrophy is a term describing microorganisms that:
A) use preformed organic compounds as a source of electrons and obtain
energy through fermentations or organic respiration
B) obtain electrons and H+ via photolysis of H2O or H2S, producing O2 or S2,
respectively
C) perform photolysis of small organic molecules
D) all of the above
E) none of th e above

Your answer is CORRECT.
Which of the following statements is true regarding the electron donors in
bacterial and archaeal metabolism?

A) The use of organic compounds as electron donors is known as organotrophy.

B) Lithotrophy refers to the use of inorganic molecules as electron sources.

C) Photoheterotrophs support catabolism by using light energy to catabolize
organic molecules.

D) All of the above statements are true
E) Only two of the above statements (A-C) are true.


Your answer is CORRECT.
Which of the following statements is true regarding the electron donors in
bacterial and archaeal metabolism?
A) The use of inorganic compounds as electron donors is known as
organotrophy.
B) Lithotrophy refers to the use of organic molecules as electron sources.
C) Organotrophs perform photolysis of small organic molecules.
D) Fe2+, H2S, or H2 would be electron donors for lithotrophs.
E) None are true; all are false statements.

Your answer is CORRECT.

,Which of the following statements is false regarding the electron donors in
bacterialand archaeal metabolism?
A) The use of organic compounds as electron donors is known as organotrophy.
B) Glucose would be a suitable electron donor for lithotrophs.
C) Photoheterotrophs support catabolism by using light energy to catabolize
organic molecules.
D) Organotrophs would not use Fe2+, H2S, or H2as electron donors

Your answer is CORRECT
Which of the following regarding respiration, phototrophy, & lithotrophy is
mismatched?
A) anaerobic reduction of CO2 to CH4: methanotrophy
B) arrangement of electron transfer system components: strong electron donors
followed by strong electron acceptors
C) combination of proteins, chlorophylls, & accessory pigments: antenna complex
D) the reduction of organic or inorganic molecules using H2: hydrogenotrophy

Your answer is CORRECT.
Which of the following regarding respiration, phototrophy, & lithotrophy
is mismatched?

A) anaerobic reduction of CO2 to CH4: methanogenesis

B) arrangement of electron transfer system components: strong electron donors
followed by strong electron acceptors

C) combination of proteins, chlorophylls, & accessory pigments: antenna
complex

D) the reduction of organic or inorganic molecules using H2:
denitrification

E) oxidation of sulfur in the presence of iron: produces sulfuric acid & corrodes
iron

Your answer is INCORRECT.
Which of the following regarding respiration, phototrophy, & lithotrophy is
mismatched?

,A) anaerobic reduction of CO2 to CH4: methanogenesis
B) arrangement of electron transfer system components: strong electron donors
followed by strong electron acceptors
C) combination of proteins, chlorophylls, & accessory pigments: antenna
complex
D) oxidation of sulfur in the presence of iron: produces sulfuric acid & corrodes
iron
E) all are matched correctly


Your answer is CORRECT.
What is lithotrophy?

A) breakdown of molecules using light energy

B) oxidation of organic electron donors to CO2 and H2O

C) photolysis of H2S or H2O coupled to CO2 fixation

D) oxidation of inorganic electron donors such as Fe2+ using O2 or
anaerobic electronic acceptors

E) none of the above

Your answer is CORRECT.
Which of the following is true concerning phototrophy?
A) Cyanobacteria have either photosystem 1 (PS1) or photosystem 2 (PS2), not
both.
B) Green-sulfur bacteria like Chlorobia have an anaerobic PS2 which forms
NADPH.
C) An oxygenic PS1 produces ATP in the purple nonsulfur bacteria like
Rhodospirillum.
D) Green-sulfur bacteria can photolyze inorganic electron donors like H2S or
Fe2+; cyanobacteria photolyze water.

Your answer is CORRECT.
Which of the following is false concerning phototrophy?

, A) Cyanobacteria have both photosystem 1 (PS1) and photosystem 2 (PS2)
B) Green-sulfur bacteria like Chlorobia have an anaerobic PS1 which forms
NADPH.
C) An anaerobic PS2 produces ATP in the purple nonsulfur bacteria like
Rhodospirillum.
D) Green-sulfur bacteria can photolyze inorganic electron donors like H2S or
Fe2+; cyanobacteria photolyze water.
E) None are false; all are correct statements.

Which of the following is false concerning phototrophy?

A) Cyanobacteria have both photosystem 1 (PS1) and photosystem 2 (PS2)

B) Green-sulfur bacteria like Chlorobia have an anaerobic PS1 which forms
NADPH.

C) An anaerobic PS2 produces ATP in the purple nonsulfur bacteria like
Rhodospirillum.

D) PS1 and PS2 both utilize bacteriorhodopsins to absorb light.
E) Green-sulfur bacteria can photolyze inorganic electron donors like H2S or

Fe2+; cyanobacteria photolyze Water

Your answer is CORRECT.
Which is false concerning bacteriorhopsin-based phototrophy?
A) Chlorophyll is the light absorbing molecule in the protein.
B) it optimally absorbs light in the green wavelength, giving the bacteriorhopsin a
purplish color.
C) Light-induced conformational changes of the bacteriorhopsin cause the protein
to extrude one proton.
D) It is present in Archaea and in some bacteria.

Your answer is CORRECT.
Which is true concerning bacteriorhopsin-based phototrophy?