In most eumetazoans, the innermost tissue layer during development is the ____
a. mesoderm
b. epiderm
c. mesoglea
d. endoderm
e. ectoderm
ANSWER: d
You might also like to view...
Which of the following represents the expected genotypes of an F1 generation consisting of 8 individuals from a cross of a true-breeding black BB. rabbit and a true-breeding white bb. rabbit?
A. 8 BB, 0 bb, 0 Bb B. 4 BB, 4 bb, 0 Bb C. 2 BB, 2 bb, 4 Bb D. 0 BB, 0 bb, 8 Bb
Which of the following statements about plant and animal development is false?
A. Cell division occurs in discrete regions within the plant body, but tissue differentiation occurs throughout the plant body. B. Cell differentiation and growth occurs throughout the developing animal body. C. Animal cells move during development, whereas plant cells do not. D. In both plants and animals, signaling molecules induce cell differentiation. E. Animal embryos pass through a gastrula stage, whereas plant embryos do not.
This lineage of Echinoderms is made up of sea cucumbers, which are elongated along their oral-aboral
axis and have a well-developed circulatory system.
a. Echinoidea b. Ophiuroidea c. Crinoidea d. Holothuroidea e. Asteroidea
The dermal endoskeleton of echinoderms is made of
a. cartilage. b. bone. c. calcium carbonate. d. chitin.