Use the Following Information to Answer the Question

question 29

Multiple Choice

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

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

• A) In sea urchins, fertilization of eggs by sperm is dependent upon species-specific protein interactions.
• B) Only some species of sea urchins use receptor proteins on their eggs to bind sperm.
• C) Protein-coated plastic beads should not be used to test sperm binding to eggs.
• D) S. franciscanus is probably not a sea urchin, but must be some other type of organism.

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Definitions:

Diet

The sum of food and beverages consumed by an individual or group, often considered in the context of variety, quality, and quantity for health and nutrition.

Correlational Research

A type of non-experimental research method that measures the relationship between two or more variables, without implying causation.

Systematic Observations

Observational methods that are structured and organized in a consistent manner to collect data about behavior or phenomena.

Dependent Variable

The variable in an experiment that is expected to change in response to manipulations of the independent variable.