Phototrophy

Question 1

Photosynthesis

Answer 1

Capture light energy
Use light energy to make ATP and NADPH (reducing power)
Use ATP and NADPH to reduce and incorporate CO2 (CO2 fixation)

Question 2

Phototrophy

Answer 2

Use of light energy to fuel cellular activities, not necessarily CO2 fixation

Question 3

Rhodopsin-based phototrophy

Answer 3

PMF formed by light-absorbing pigment (light-driven proton pump)

Question 4

Chlorophyll-based phototrophy

Answer 4

e- flow through ETC to NADP+

Question 5

Rhodopsin-based phototrophy performed by

Answer 5

Performed by some bacteria and archaea

Question 6

Rhodopsin-based phototrophy called in archaea

Answer 6

Archaerhodopsin

Question 7

Archaerhodopsin

Answer 7

Halobacterium salinarum best studied

Made under low [O2] and high light intensity

Question 8

Some bacteria have rhodopsins

Answer 8

Proteorhodopsin (Proteobacteria)

Xanthorhodopsin (extreme haliphilic bacteria)

Question 9

Rhodopsin phototrophy light-drive proton pump

Answer 9

Generates PMF without oxidizing NADH by an ETC

if lacking ETC PMF can be used to make ATP by chemiosmosis

Question 10

Rhodopsin is structurally similar to

Answer 10

rhodopsin found in mammalian eye