Exam 13: Phototrophy, Chemolithotrophy, and Major Biosyntheses

What is the difference between chlorophyll and bacteriochlorophyll, and which organisms contain each?

Due to the sensitivity of dinitrogenase reductase, nitrogen fixation is inhibited by

Photosynthetic membrane systems in chloroplasts are called________ .

In photosynthesis NADH and NADPH are produced from NAD+ and NADP+ by

In the autotrophic reactions of photosynthesis, chemical energy is used to reduce carbon dioxide.

Inorganic nitrogen compounds are oxidized aerobically by certain bacteria in the process known as________ .

Definitive proof of N₂ fixation is obtained using

Under what circumstances does oxygenic photophosphorylation use non- cyclic photophosphorylation and when does it use cyclic photophosphorylation? Also describe what occurs during each process.

Ferrous iron oxidation generally occurs in environments with

Photosynthesis is most correctly defined as the

The rapid and simplistic method of assaying for nitrogenase activity uses

The reduction of N₂(g) for use as a source of nitrogen for biosynthetic needs is called nitrogen

One result of the oxidation of reduced sulfur compounds is a rise in the pH of the medium.

Which statement is TRUE?

Plastocyanin is a

In synthesizing one hexose from carbon dioxide by the Calvin cycle,________ molecules of NADPH and _________ molecules of ATP are required.

Nitrogen fixation is repressed by________ and ________.

As long as Thiobacillus ferrooxidans has Fe3+ available, ATP synthesis can occur at the expense of the natural proton motive force that preexists across the cytoplasmic membrane.

Why does an organism that is able to respire both aerobically and anaerobically preferentially undergo aerobic respiration?

Photosystem II absorbs shorter wavelengths of light, whereas photosystem I absorbs the longer wavelengths.