Which of the Following Statements Is True Concerning the Use

question 58

Multiple Choice

Which of the following statements is true concerning the use of cyclic di-GMP as a second messenger?

• A) It activates the expression of flagellin genes and thus enhances motility.
• B) It is found in all microbes: bacteria, archaea, and eukaryotic microbes.
• C) It is produced by the action of diguanylate cyclase.
• D) It decreases in level as biofilm is produced.
• E) Phosphodiesterase can convert GMP to cyclic di-GMP.

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Definitions:

Desert

A barren area of landscape where little precipitation occurs, and consequently, living conditions are hostile for plant and animal life.

Wind Erosion

The removal of soil, rock fragments, or fine particles by the force of the wind over land surfaces.

Volcanic Necks

Solidified lava within the conduit of an extinct volcano, exposed after the surrounding softer rock has eroded away.

Desertification

The converting of a land into a desert by natural or human causes.