FALSE regarding biotransformation of drugs is:

 # FALSE regarding biotransformation of drugs is:

A. It usually converts a drug into its lipid soluble non ionized form

B. It generally involves modifications of the chemical structure of the drug

C. It principally occurs in the microsomal enzyme system of the liver

D. The rate may vary significantly between species

The correct answer is A.  It usually converts a drug into its lipid soluble non ionized form.

Biotransformation involves the conversion of a lipid soluble non ionized form of a drug into its more water soluble metabolites.

Biotransformation increases the absorption of the drug into the bloodstream, enhancing the bioavailability of the drug. Water soluble drugs are also easily excreted in the urine.

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Globulomaxillary cyst is found between:

 # Globulomaxillary cyst is found between:

A. Central incisors

B. Central incisor and lateral incisor

C. Lateral incisor and canine

D. Canine and premolar

The correct answer is C. Lateral incisor and canine.

The globulomaxillary cyst has traditionally been described as a fissural cyst found within the bone between the maxillary lateral incisor and canine teeth. Radiographically, it is a well-defined radiolucency which frequently causes the roots of the adjacent teeth to diverge.

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The name of the second visceral arch is:

# The name of the second visceral arch is:

A. Mandibular

B. Hyoid

C. Maxillary

D. None of the above

The correct answer is B. Hyoid.

There is no specific name for each branchial arch except the first and second. The first one is called as the Mandibular and the second one is the hyoid arch.

The nerve fibers from the mandibular division of the trigeminal nerve are derived from the mandibular arch. The seventh, ninth and tenth cranial nerves are derived from the second, third and fourth branchial arches respectively.

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The name of the first visceral arch is:

 # The name of the first visceral arch is:

A. Mandibular

B. Hyoid

C. Maxillary

D. None of the above

The correct answer is A. Mandibular.

There is no specific name for each branchial arch except the first and second. The first one is called as the Mandibular and the second one is the hyoid arch.

The nerve fibers from the mandibular division of the trigeminal nerve are derived from the mandibular arch. The seventh, ninth and tenth cranial nerves are derived from the second, third and fourth branchial arches respectively.

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