Biology

In mammalian eggs, the receptors for sperm are found in the A) fertilization me

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Compared to sea urchin eggs, those of mammals A) complete the fertilization proc

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A human blastomere is A) an embryonic cell that is much smaller than the ovum. B

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At the moment of sperm penetration, human eggs A) have used flagellar propulsion

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In a developing frog embryo, most of the yolk is A) located near the animal pole

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The pattern of embryonic development in which only the cells lacking yolk subseq

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As cleavage continues during frog development, the size of the blastomeres A) in

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During the early part of the cleavage stage in frog development, the rapidly dev

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The vegetal pole of the zygote differs from the animal pole in that A) the veget

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The small portion of the embryo that will become its dorsal side develops from t

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The yolk of the frog egg A) prevents gastrulation. B) is concentrated at the ani

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An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive s

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Meroblastic cleavage occurs in A) sea urchins, but not humans or birds. B) human

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Which of the following correctly displays the sequence of developmental mileston

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The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate e

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Cells move to new positions as an embryo establishes its three germ tissue layer

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If gastrulation was blocked by an environmental toxin, then A) cleavage would no

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The archenteron of the developing frog eventually develops into the A) reproduct

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The vertebrate ectoderm is the origin of the A) nervous system. B) liver. C) pan

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In frog embryos, the blastopore becomes the A) anus. B) ears. C) eyes. D) nose.

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In a frog embryo, gastrulation A) produces a blastocoel displaced into the anima

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The earliest developmental stage among these choices is A) germ layers. B) morul

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Which of the following is a correct description of an anatomical relationship? A

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An open space within the gastrula is the A) ectoderm. B) mesoderm. C) archentero

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Although it contributes no cells to the embryo, the formation of the primitive s

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