Exam 19: Archaeal Diversity

Which of the following is responsible for movement away from DNA-damaging light?

Bacteriorhodopsin absorbs light and pumps H⁺ ________ the cell, whereas light-activated halorhodopsin pumps chloride ________ the cell.

All types of methanogenesis are poisoned by ________ and therefore require extreme ________.

Sulfolobus species are referred to as double ________, meaning they require high temperature and high acidity simultaneously.

In methanogenesis from CO₂ and H₂, the initial incorporation of H₂ requires a coupled gradient of which ion?

Methanogenesis includes a unique pathway of carbon fixation, called the carbon monoxide ________ pathway, because the key enzyme can fix CO as well as CO₂.

Which of the following is unique to archaea?

Most organisms of the order ________ lack both a cell wall and an S-layer.

Which of the following species is aerobic?

With respect to pH, the ________ show the widest range of any clade.

What are some of the unique features of archaeal gene regulation?

Which of the following influences the fermentation efficiency of the gut flora?

Commercial evaporation pools for salt production benefit from the presence of red ________, whose light absorption accelerates heating and evaporation.

The energy-yielding process of ________ occurs only in the archaea.

In wastewater, the bacteria are packed together by filamentous ________ to form sludge.

The Sulfolobus species maintains an internal pH ________ that of its habitat.

The major environmental location of methanogens is

Why are the archaea so difficult to classify?

Bovine ________ not only make a significant contribution to global methane, but also divert carbon from meat production.

Why are hot springs and geysers important habitats for many crenarchaeotes?