Unit 1

5. Rivers and glacial sediments deposit iron near coasts
6. Organic sulfur compound produced by marine phytoplankton as a compatible solute
7. heterotrophic microbes, release carbon as CO2 is an example of a __________ of carbon
8. Iron-chelating molecules that solubilize Fe³⁺ and transport it into cells as Fe²
9. A saturated zone example which is of increasing interest to environmental microbiologists for their potential to treat polluted waste streams
11. Zone of lake - The surface of open water with sufficient light for photosynthesis
13. warm, oxygen-rich upper layer of lake
14. Saturated zone of soil
15. When water potential becomes less negative (closer to 0 atm), soil becomes __________________
17. This is an example of a low temperature environment
19. pH of soil in high rainfall areas
21. The ability of soil to hold and exchange positively charged ions.
23. An example of a substance that stabilize proteins and membranes during dehydration
24. Direct contact with iron oxides via _________________ is a microbial strategy to combat the challenge of poor availability of Fe³⁺ in the environment

1. Red tide is an example of ___________
2. An example of an aphotic environment based on chemolithoautotrophy
3. Step in which nitrate is reduced and incorporated in biomass.
4. Freshwater environments, lakes, like the open seas, are often __________ environments
10. Fe³⁺ serves as a terminal electron acceptor for anaerobic respiration
12. interfacial aquatic habitat in which many microbial groups are laterally and tightly compressed into a thin mat of biological activity
16. Humified organic matter accumulates in this layer of soil
18. Special proteins that repair or refold damaged proteins exposed to high temperatures.
20. Mangroves are described as trees adapted to ____________ environment
22. This soil texture have many small pores, so they have high total pore space, but water moves slowly