光能异养型的光合细菌典型代表是红螺菌科的微生物，常以小分子有机酸或脂肪酸为碳源，进行——————或——————呼吸。

还原态无机硫化物在微生物作用下进行氧化生成硫酸盐及其盐类的过程称为————————。

在厌氧条件下，微生物将硫酸盐还原为硫化氢的过程称为————————。

湖泊水体中微生物种类多样性与水面面积有关，面积越大，微生物多样性________。

死区现象，即水体富营养化的根本原因是________________。

Which of the following reactors has a continuous input, output, and are completelymixed?

A. Batch reactor
B. Chemostat
C. Plug flow reactor
D. Swquencing batch reactor

We can enumerate cells in pure cultures by all of the following EXCEPT: ()

A. Most probale number
B. Plate counts
C. turbidity
D. PCR

Acetate is added to sites that have both Uranium and Iron in subsurface, which:

A. gets oxidized and it oxidizes both Iron and Uranium rendering them immobile
B. gets oxidized and it reduces both Iron and Uranium rendering them immobile
C. is oxidized by Geobacter and the consequent products immobilize Iron and Uranium
D. is more effective than addition of lactate when it comes to Uranium sequestration

Which of the following intermediates is the last step in biodegradation of many aromatic compounds, because upon its degradation the aromatic ring breaks and is easily degraded:

A. benzendiol
B. catechol
C. benzoate
D. o-cresol

反硝化作用的最终产物是;()

A. NH3
B. HNO3
C. N2
D. HNO2