Georgia Tech School of Biology

Fall 2011Biol 1510

Q: If cytoplasmic ATP concentration is high, and the extracellular H+ concentration is low, then

a) ATP synthase will synthesize ATP at a slower rate

b) ATP synthase will synthesize ATP at a faster rate

c) ATP synthase will hydrolyze ATP and pump protons out of the cell

d) ATP synthase will hydrolyze ATP and pump protons into the cell

Georgia Tech School of Biology

Fall 2011Biol 1510

When a marshmallow catches fire and burns (C6H12O6 + 6O2 6CO2 + 6 H2O),

a) The carbon atoms of sugar are reducedb) The hydrogen atoms of sugar are reducedc) Molecular oxygen is reducedd) All of the abovee) None of the above

Georgia Tech School of Biology

Fall 2011Biol 1510

Heating the marshmallow

a) Made the G of the glucose oxidation reaction more negative

b) Lowered the activation energy barrier for the glucose oxidation reaction

c) Acted as a catalyst for the glucose oxidation reaction

d) Provided the activation energy required for the glucose oxidation reaction

Biology 1510

Georgia Tech School of Biology

Fall 2011Biol 1510

In cells, the pathway of electrons is

a) From food to the electron transport chain to NAD+ to oxygen

b) From oxygen to the electron transport chain to NAD+ to food.

c) From food to NAD+ to the electron transport chain to ATP synthase

d) From food to NAD+ to the electron transport chain to the terminal electron acceptor

e) From food to NAD+ to the electron transport chain to ADP

Georgia Tech School of Biology

Fall 2011Biol 1510

Q: An organism that gets electrons from H2 and makes its own organic carbon from carbon dioxide is classified as a:

a) Chemoheterotrophb) Chemoautotrophc) Photoheterotrophd) Photoautotroph

Georgia Tech School of Biology

Fall 2011Biol 1510

Q: Which of the following would NOT have been a possible energy-harvesting pathway for the LUCA?

a. Organic molecules as electron donor, sulfate as electron acceptor

b. Organic molecules as electron donor, oxygen as electron acceptor

c. H2 as electron donor, Fe+3 as electron acceptor

Georgia Tech School of Biology

Fall 2011Biol 1510

Q: Oxidative phosphorylation occurs in

a) All cells in the presence of oxygen

b) Only in mitochondria in the presence of oxygen

c) Only in mitochondria, using either oxygen or alternative electron acceptors

d) All respiring cells, using either oxygen or alternative electron acceptors

e) All respiring cells, except Archaea

Georgia Tech School of Biology

Fall 2011Biol 1510

Microbial fuel cells – bioelectrical energy

Anoxic layer

Oxic zone

Georgia Tech School of Biology

Fall 2011Biol 1510

What metabolic processes are microbes at the anode using to make most of their ATP?

a) Aerobic respirationb) Oxidative phosphorylationc) Anaerobic respirationd) Both a) and b)e) Both b) and c)

Biology 1510

Georgia Tech School of Biology

Fall 2011Biol 1510

What is the ultimate source of the electrons collected by the anode?

a) Organic molecules used as food by the bacteria

b) Water c) Oxygend) Carbon dioxide

Georgia Tech School of Biology

Fall 2011Biol 1510

The electron transport chain in bacteria is located

a) In their mitochondrial inner membranesb) In their mitochondrial outer membranesc) On their plasma membranesd) In the cytoplasme) In the nucleoid

Georgia Tech School of Biology

Fall 2011Biol 1510

Which reagents added to the mud around the anode would boost electricity output?

a) Oxygenb) More organic food moleculesc) More terminal electron acceptors such as

sulfated) More protons (lower pH)e) A microbicide (antibiotic)

Georgia Tech School of Biology

Fall 2011Biol 1510

Can eukaryotic cells generate electric current in this kind of microbial fuel cell?