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Do Halobacteria grow best in the presence or absence of oxygen?

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Presentation on theme: "Do Halobacteria grow best in the presence or absence of oxygen?"— Presentation transcript:

1 Do Halobacteria grow best in the presence or absence of oxygen?

2 Are halobacteria able to grow without oxygen? What data supports your conclusion?

3 Halobacteria use bacteriorhodopsin (BR) to produce ATP using light energy bacteriorhodopsin (BR) ADP ATP P+ LIGHT

4 bacteriorhodopsin (BR) ADP ATP P LIGHT LIGHT PRESENT Halobacteria use bacteriorhodopsin (BR) to produce ATP using light energy

5 ATP bacteriorhodopsin (BR) ADP ATP P LIGHT LIGHT PRESENT Halobacteria use bacteriorhodopsin (BR) to produce ATP using light energy

6 bacteriorhodopsin (BR) ADPP+ LIGHTLIGHT ABSENT (DARK) Halobacteria use bacteriorhodopsin (BR) to produce ATP using light energy

7 bacteriorhodopsin (BR) ADP ATP P+ LIGHT LIGHT PRESENT Halobacteria use bacteriorhodopsin (BR) to produce ATP using light energy bacteriorhodopsin (BR) ADP ATP P+ LIGHT LIGHT ABSENT (DARK)

8 Bacteriorhodopsin (BR) is made from bop protein and the molecule retinal bop protein retinal Drawing not to scale and shapes are over simplified!!! bacteriorhodopsin (BR)

9 Light Drawing definitely not to scale!!! Halobacterium cell Halobacteria change their expression of BR in response to the amount of light in their environment

10 LightbR + The amount of bR increases when there is more light. Note that the size of nodes in this diagram relates to the amount of light and bR, not the actual size. In other words, the size of bR does not change; a larger node for bR indicates a larger amount of bR. Halobacteria change their expression of BR in response to the amount of light in their environment

11 OUR QUESTION: How do Halobacteria cells change the amount of bR in response to light?


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