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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.

More Questions
TLS Online TPP Program

#Question id: 23253

#Unit 13. Methods in Biology

FISH is an in vitro assay that uses fluorescent reporter attached to a _______ that hybridizes to chromosomes.
TLS Online TPP Program

#Question id: 15179

#Unit 2. Cellular Organization

Escherichia coli, Neisseria gonorrhoeae, Trichomonas vaginalis bacterias are examples of
TLS Online TPP Program

#Question id: 11094

#Unit 7. System Physiology – Animal

CO2 is more easily transferred into water across respiratory membranes compared to O2 because CO2
TLS Online TPP Program

#Question id: 12484

#Unit 2. Cellular Organization

Match the following.

Column I

Column II

A. APC/CCdc20

i . responsible for ubiquitinating proteins, such as mitotic cyclins

B. APC/CCdh1

ii. responsible for destroying proteins, such as securin

 

iii. promotes the metaphase–anaphase transition

 

iv. Promotes exit from mitosis

Which of the following is correct?
TLS Online TPP Program

#Question id: 13212

#Unit 6. System Physiology – Plant

The water at the top of a tree develops a large tension (a negative hydrostatic pressure), and this tension pulls water through the xylem this mechanism is called ,