The Basic Rule That Governs the Effects of Teratogens Is

question 120

Multiple Choice

The basic rule that governs the effects of teratogens is that

• A) the more teratogens present, the more likely it is that prenatal development will be adversely affected.
• B) the larger the molecule (virus, chemical, etc.), the greater the risk of a harmful effect by the teratogen.
• C) the further the pregnancy has advanced, the greater the risk for defects or malformations.
• D) an organ system is most vulnerable to disruption during the time when it is developing rapidly.

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Definitions:

Alternation of Generations

A reproductive cycle of certain plants and algae that involves a regular alternation between two distinct forms: the sexual phase (gametophyte) and the asexual phase (sporophyte).

Liverwort

Bryophyte with a lobed or leafy gametophyte and a sporophyte composed of a stalk and capsule.

Protonema

The initial stage in the life cycle of mosses and some algae, characterized by a thread-like chain of cells.

Gametophyte

The haploid stage in the life cycle of plants and algae that produces gametes, or sex cells, through mitosis.