Teratogens ____.

Question

Teratogens ____.

BlackTom AI · Accepted Answer

Teratogens are agents that can interfere with development in utero, leading to birth defects or developmental abnormalities. 
Option 1 suggests they are harmful because they irritate skin or lungs. While some teratogens may have irritant properties, the core definition of a teratogen centers on developmental harm to an unborn child, not merely irritation of external tissues. This makes the statement incomplete and misleading as a general characterization.
Option 2 claims they cause infections. Teratogens are not defined by causing infections; infections can be harmful to pregnancy for various reasons, but that does not define teratogenic effects. The causal link to birth defects is not established by this option.
Option 3 states they are fatal to humans in low doses. Teratogens do not have a universal rule of being fatal at low doses; many teratogens may cause subtle or variable developmental issues rather than immediate fatal outcomes. The dose-response relationship for teratogenicity is complex and not accurately captured by this blanket claim.
Option 4 asserts they cause allergic reactions. Allergic reactions pertain to immunologic responses and are not the defining mechanism of teratogenic harm to fetal development. While exposure could conceivably trigger an allergy, that does not describe teratogenic risk.
Option 5 correctly states that teratogens cause birth defects. This aligns with the established understanding that these agents can disrupt fetal development and result in congenital abnormalities, which is the key feature of teratogenicity.

11:375:101:01 INTRO ENV SCIENCE Exam #3

Teratogens ____.

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