(February 2013) Durham tubes are used in microbiology to detect production of gas by microorganisms. They are simply smaller test tubes inserted upside down in another test tube. This small tube is initially filled with the solution in which the microorganism is to be grown.
A compound predicate is two or more simple predicates joined by a conjunction that indicate actions by the same subject. Example : Bill picked up the mail and walked the dog.. Bill is the subject for both verbs.
A clause is a group of words that can act as a sentence, but is not necessarily a complete sentence on its own. All clauses contain both a subject and a predicate, which always contains a verb. A predicate tells something about what the subject is doing.Some clauses can stand alone as a complete sentence; others cannot. Below are a few examples of clauses: Example 1: She danced.(âSheâ is the subject.ll clauses contain both a subject and a predicate, which always contains a verb. A predicate tells something about what the subject is doing. Some clauses can stand alone as a complete sentence; others cannot. Below are a few examples of clauses: Example 1: She danced. (âSheâ is the subject.