The Effect of the Chemotherapeutic Drug Methotrexate Is Best Described

question 4

Multiple Choice

The effect of the chemotherapeutic drug methotrexate is best described as:

• A)Disruption of the mitotic spindle.
• B)Impaired synthesis of deoxyribonucleotides from ribonucleotides.
• C)Inhibition of orotic acid synthesis in the biosynthetic pathway of pyrimidine nucleotides.
• D)Depletion of tetrahydrofolate.
• E)Induction of mutations by DNA methylation.

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Definitions:

Petals

Colored or patterned parts of a flower, involved in attracting pollinators and protecting reproductive structures.

Double Fertilization

A process in the flowering plant life cycle in which there are two fertilizations; one fertilization results in formation of a zygote, whereas the second results in formation of endosperm.

Sperm

Male reproductive cells designed to fertilize female ova (eggs) during sexual reproduction.

Reproductive Structures

Organs or features of organisms that are involved in the production of offspring.