Many marine mollusks have distinctive larvae which have their bodies encircled by a row of cilia. These larvae are called
A. planulae.
B. polyps.
C. miracidia.
D. zoecia.
E. trochophores.
E. trochophores.
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Which of the following statements is NOT true about gamete formation in mammals?
A. In the female, the separation of cytoplasm is unequal during meiosis. B. Only one of the four cells resulting from meiosis goes on to become an oocyte. C. Only one of the four cells resulting from meiosis goes on to become an egg, which becomes a zygote upon fertilization by a sperm cell. D. The polar bodies formed during meiosis in the female can participate in fertilization with sperm. E. The cytoplasm is diminished during development of sperm, and a flagellum is formed to give sperm locomotion.
The oldest well-documented flowering plant fossils date to about ____ years ago
a. 1.5 billion b. 420 million c. 125 million d. 250 million e. 17 million
Respiratory neurons from the dissected brainstem of a neonatal rodent can maintain rhythmic firing for
how many hours?
a. 0 b. 1 c. 4 d. 6 e. 8
What enables the pigments indigo and carmine to capture light?
a. a single hydrogen bond b. a single bond of any element c. a conjugated system d. a double oxygen bond