Dental Admissions Test (DAT) Practice Test

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Prepare for the Dental Admissions Test (DAT) efficiently. Utilize flashcards and multiple-choice questions with helpful explanations. Ace your exam!

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Which of the three primary germ cell layers is responsible for forming the nervous system?

Domain, Phylum, Class, Family
Ectoderm
Incomplete Dominance
Unipotent

The correct answer is: Ectoderm

The other options, namely Domain, Phylum, Class, and Family are not primary germ cell layers. Instead, they are various taxonomic levels used to classify living organisms. Option C, Incomplete Dominance, refers to a type of genetic inheritance and is not a germ cell layer. Option D, Unipotent, refers to a cell's ability to differentiate into one specific cell type and is not a germ cell layer. Only option B, Ectoderm, is one of the three primary germ cell layers responsible for forming the nervous system. The ectoderm is the outermost layer of cells in the early embryo and gives rise to structures such as the brain, spinal cord, and skin. Therefore, option B is the correct answer.