The structure labeled "A" in the figure is a(n)
a. club-shaped reproductive cell.
b. zygote.
c. ascus.
d. gill from the underside of a mushroom.
e. spore sac.
A
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Microtubules grow longer:
A. more quickly at one end than the other. B. by growing outward from the centrosome. C. in cycles, following rapid depolymerization. D. if free tubulin dimers are available. E. All of these choices are correct.
The inner cell mass, which is formed when the blastula rearranges into two layers, will go on to become what?
a. myometrium b. endometrium c. embryo d. placenta
The ____________________ valve is located between the right atrium and ventricle. Fill in the blank(s) with the appropriate word(s)
Which structure is part of the placenta and completely surrounds the embryo?
A) chorion B) amnion C) yolk sac D) allantois