In an Organism Such as a Sea Urchin, Administration of Actinomycin

question 15

Multiple Choice

In an organism such as a sea urchin, administration of actinomycin D prevents RNA synthesis. However, early development up to gastrula formation can take place in the presence of actinomycin D but gastrulation cannot. This implies that __________.

• A)development beyond gastrulation requires actD
• B)actD is part of the normal environment of a sea urchin and serves as a developmental signal molecule
• C)actD receptors begin to form only on cell surfaces of the gastrula
• D)maternal effect genes regulate development until gastrulation
• E)immature sea urchin embryos produce actD to regulate further development

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