In the blastocyst, the trophoblast will become ________, whereas the embryoblast will become ________.
A. the embryo; the yolk sac
B. part of the placenta; the embryo
C. the yolk sac; the embryo
D. the embryo; part of the placenta
E. part of the placenta; the yolk sac
Answer: B
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Microtubules
A) are usually composed of myosin. B) are hollow, filamentous structures. C) attach the plasma membrane to the underlying cytoplasm. D) interact with filaments composed of tubulin to produce muscle contractions. E) are found on the ribosomes.
Which statement best describes the texture of the sheep lung?
A) It feels stiff and rigid. B) It feels like a slippery hose. C) It feels like a copper pipe. D) It feels like a sponge.
Tubular ____________________ and tubular ____________________ are selective processes that occur in the nephron
Fill in the blank(s) with correct word
What is the permeability barrier that joins the plasma membranes of adjacent cells to form a tight seal?
A. Desmosomes B. Tight junction C. Hemidesmosomes D. Adhesion belt E. Gap junction