What is the most likely effect of exposure to a teratogen such as thalidomide during the embryonic phase of development?

Question

BlackTom AI · Accepted Answer

The question asks about the most likely effect of exposure to a teratogen like thalidomide during the embryonic phase of development.
Option A suggests physiological changes without structural changes in organs. While functional disturbances can occur, thalidomide is classically associated with visible structural malformations rather than only functional changes, especially when exposure occurs during specific embryonic windows. This makes A incomplete as a general characterization.
Option B states that the embryo may develop structural abnormalities in several organs. This aligns with classic teratogenic risk data for thalidomide, which during critical periods of organogenesis can produce congenital malformations affecting multiple structures, such as limbs and internal organs depending on timing of exposure. The emphasis on structural abnormalities corresponds to well-established teratogenic effects.
Option C posits that the embryo would either undergo death and miscarriage, or survive intact. While severe teratogen exposure can cause fetal loss, this option exaggerates the binary outcome and ignores the common occurrence of malformations in live births; it thus oversimplifies and is not the most accurate general statement for thalidomide exposure.
Option D claims that only growth or organ size would be affected. Teratogenic effects are typically more specific to structural formation and patterning rather than simply altering size; size changes may occur as a secondary consequence, but this option fails to capture the hallmark risk of malformations. Therefore, it is an incomplete description.
In summary, option B is the most consistent with the established teratogenic profile of thalidomide during organogenesis, which results in structural abnormalities across multiple developing organs. The other choices describe narrower or less accurate outcomes that do not reflect the primary risk profile associated with embryonic teratogen exposure.

What is the most likely effect of exposure to a teratogen such as thalidomide during the embryonic phase of development?单项选择题

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