Which of the following is a category used in chemotherapy?

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Multiple Choice

Which of the following is a category used in chemotherapy?

Chemotherapy drugs are grouped by how they disrupt cancer cell growth. Antimetabolites are one such group. They resemble the normal building blocks of DNA and RNA and interfere with DNA synthesis by acting as faulty substrates or by blocking enzymes needed to make nucleotides. Because cancer cells divide rapidly, they are particularly affected during DNA replication in the S phase, leading to impaired replication and cell death. This mechanism makes antimetabolites effective in treating various cancers, with examples like methotrexate, 5-fluorouracil, cytarabine, and mercaptopurine. Other options listed serve different purposes—beta blockers affect the heart, vaccines stimulate immune protection, and antihistamines counter allergic reactions—so they are not chemotherapy categories.

Chemotherapy drugs are grouped by how they disrupt cancer cell growth. Antimetabolites are one such group. They resemble the normal building blocks of DNA and RNA and interfere with DNA synthesis by acting as faulty substrates or by blocking enzymes needed to make nucleotides. Because cancer cells divide rapidly, they are particularly affected during DNA replication in the S phase, leading to impaired replication and cell death. This mechanism makes antimetabolites effective in treating various cancers, with examples like methotrexate, 5-fluorouracil, cytarabine, and mercaptopurine. Other options listed serve different purposes—beta blockers affect the heart, vaccines stimulate immune protection, and antihistamines counter allergic reactions—so they are not chemotherapy categories.

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