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TLS Online TPP Program

#Question id: 5648

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

 What is a broader implication from the observations of the experiment?

#Unit 5. Developmental Biology

  1. In sea urchins, fertilization of eggs by sperm is dependent upon species-specific protein interactions.

  2. Only some species of sea urchins use receptor proteins on their eggs to bind sperm.

  3. Protein-coated plastic beads should not be used to test sperm binding to eggs.

  4. S. franciscanus is probably not a sea urchin, but must be some other type of organism.

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TLS Online TPP Program

#Question id: 13190

#Unit 10. Ecological Principles

During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were
TLS Online TPP Program

#Question id: 3278

#Unit 11. Evolution and Behavior

What does the biological species concept use as the primary criterion for determining species boundaries?
TLS Online TPP Program

#Question id: 9277

#Unit 6. System Physiology – Plant

The light energy absorbed by the carotenoids is transferred to chlorophyll for photosynthesis; because of this role they are called
TLS Online TPP Program

#Question id: 19803

#Unit 12. Applied Biology

Cowpea trypsin inhibitor (cpti), serine protease inhibitor (aprotinin), are all used as alternative insecticidal proteins. They are inhibitors of 
TLS Online TPP Program

#Question id: 23563

#Unit 13. Methods in Biology

________ is the direct uptake of foreign DNA by a host cell.