#Question id: 11952

#Unit 7. System Physiology – Animal

Lysine is an essential amino acid for animals. If an animal did not consume lysine in its diet, you might expect that the animal

#Question id: 5647

#Unit 5. Developmental Biology

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?

#Question id: 17076

#Unit 12. Applied Biology

#Question id: 10453

#Unit 6. System Physiology – Plant

Studies have shown that a mutants in fact do not survive in the field under conditions of full sunlight due to photooxidative damage.

#Question id: 17072

#Unit 12. Applied Biology