Which of the following statements is true of teratogens?
A)Teratogens include only the chemical substances that are classified as alcohols.
B)The effects of chemical teratogens depend on the timing of exposure.
C)Teratogen refers to the birth defect caused by radiation.
D)Teratogens enhance the development of a fetus.

Question

Quizplus · Accepted Answer

Teratogens are substances, like drugs, chemicals, and infections, that can cause birth defects or negatively impact prenatal development. The effects of teratogens depend on the timing of exposure, as the different stages of development have different vulnerabilities. For example, exposure to alcohol during the first trimester can lead to fetal alcohol syndrome, while exposure during later stages may have less impact. Therefore, option B is the correct choice as it correctly describes the variable effects of chemical teratogens. The other options are incorrect; teratogens are not limited to alcohols (option A); teratogen refers to the causative substance not the birth defect (option C); and teratogens do not enhance development but interfere with it (option D).

Which of the Following Statements Is True of Teratogens