The Inhibition of the Synthesis of DNA by Methotrexate Results

question 50

Multiple Choice

The inhibition of the synthesis of DNA by methotrexate results from direct inhibition of

• A) a reaction in the pathway of purine biosynthesis.
• B) thymidylate synthase.
• C) the reduction of ribonucleotides to deoxyribonucleotides.
• D) synthesis of S-adenosylmethionine.
• E) the reduction of dihydrofolate to tetrahydrofolate.

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Definitions:

Language Development

The process by which infants and children acquire the ability to understand and produce spoken language.

Mean Length Of Utterance

A measurement used in the study of child language development that calculates the average number of morphemes per sentence in a child's speech sample.

MLU

Mean Length of Utterance, a measure used in language development research to estimate the complexity of children's speech.

Telegraphic Speech

Type of speech in which only the essential words are used.