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TLS Online TPP Program

#Question id: 5647

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. 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?

#Unit 5. Developmental Biology

  1. Plastic beads will bind to sperm from both species of sea urchin.

  2. ERB1 prevents S. franciscanus sperm from binding the beads.

  3. Sperm from S. purpuratus bind to beads only if ERB1 is present.

  4. S. franciscanus and S. purpuratus are actually the same species.

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TLS Online TPP Program

#Question id: 10860

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TLS Online TPP Program

#Question id: 4997

#Unit 11. Evolution and Behavior

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TLS Online TPP Program

#Question id: 19994

#Unit 2. Cellular Organization

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TLS Online TPP Program

#Question id: 11775

#Unit 10. Ecological Principles

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TLS Online TPP Program

#Question id: 969

#Unit 1. Molecules and their Interaction Relevant to Biology

In mammals, most amino acids undergo deamination in the ________.