Exam 47: Animal Development

Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1)from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. (Adapted from Kamei and Glabe 2003) Treatments: A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads B: S. purpuratus sperm mixed with beads containing no ERB1 protein C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads D: S. franciscanus sperm mixed with beads containing no ERB1 protein Based on the description of the experiment, which of the treatments would be considered a "control" treatment for S. purpuratus sperm binding?

From earliest to latest, the overall sequence of early development proceeds in which of the following sequences?

Cells transplanted from the neural tube of a frog embryo to the ventral part of another embryo develop into nervous system tissues. This result indicates that the transplanted cells were

The cortical reaction of sea urchin eggs functions directly in

One primary factor in shaping the polarity of the body axes in chick embryos is ________.

The nematode Caenorhabditis elegans ________.

In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are ________.

If an amphibian zygote is manipulated so that the first cleavage plane fails to divide the gray crescent, then ________.

The archenteron of the developing sea urchin eventually develops into the ________.

Which of the following correctly displays the sequence of developmental milestones?

Cells move to new positions as an embryo establishes its three germ tissue layers during ________.

In a newly fertilized egg, the vitelline layer ________.

In a frog embryo, gastrulation ________.

The cortical reaction of sea urchin eggs functions directly in ________.

In mammalian eggs, the receptors for sperm are found in the ________.

Cell migration occurs extensively during ________.

The migratory neural crest cells ________.

Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1)from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. (Adapted from Kamei and Glabe 2003) Treatments: A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads B: S. purpuratus sperm mixed with beads containing no ERB1 protein C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads D: S. franciscanus sperm mixed with beads containing no ERB1 protein Based on the data in the graph, which of the following conclusions is supported?

In humans, identical twins are possible because ________.

Which of the following is common to the development of both birds and mammals?