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BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
ISBN: 9781305967359

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BuyFindarrow_forward

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition
STARR
ISBN: 9781305967359
Textbook Problem

In 2005, a new species of green sulfur bacteria was discovered near a geothermal vent at the bottom of the ocean. An exceptionally efficient light-harvesting mechanism allows these bacteria to carry out photosynthesis where the only illumination is a dim volcanic glow emanating from the vent. Cell membranes are required for electron transfer chains in the light-dependent reactions, but these bacteria have no internal membranes. How do you think they carry out the light-dependent reactions?

Summary Introduction

To determine:

The way in which light-dependent reactions are carried out by green sulfur bacteria.

Introduction:

Photosynthesis is the process by which carbon dioxide and water are converted into sugar and oxygen molecules. Photosynthesis is not done in a single step; rather it is a two-stage reaction. The reactions that are involved in the photosynthetic pathway are light-dependent reactions and light-independent reactions.

Explanation

Green sulfur bacteria are unique because it has photosynthetic apparatus and powerful antennas that capture the light even if it is present in a minute amount. These bacteria have an efficient light-harvesting system that allows them to survive even in lowermost parts.

The ways in which light-dependent reactions are carried out by green sulfur bacteria are as follows:

• These bacteria do not have internal membranes to carry light-dependent reaction, but these have light harvesting organelles that are known as chlorosomes...

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