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TLS Online TPP Program

#Question id: 5646

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 description of the experiment, which of the treatments would be considered a "control" treatment for S. purpuratus sperm binding?

#Unit 5. Developmental Biology

  1. Treatment A

  2. Treatment B

  3. Treatment C

  4. Treatment D

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TLS Online TPP Program

#Question id: 15247

#Unit 5. Developmental Biology

In the syncytial blastoderm, nuclei in the anterior part of the cell are exposed to ------------- that are not present in the posterior part of the cell, and vice versa.
1. Cytoplasmic determinants
2. Maternal factors
3. Zygotic gene
4. Paracrine signals
TLS Online TPP Program

#Question id: 26881

#Unit 10. Ecological Principles

later arriving species are generally K-selected which are___
TLS Online TPP Program

#Question id: 28782

#Unit 2. Cellular Organization

The rate of polymerization of actin filaments is given by rate constant K, in which_____
a) the addition of monomers is given by kon (M–1 sec–1 ) 
b) the addition of monomers is given by koff  (sec–1)
c) the loss of monomers is given koff (M–1 sec–1 ) 
d) the loss of monomers is given koff (sec–1)
TLS Online TPP Program

#Question id: 12581

#Unit 10. Ecological Principles

Which of the following causes an increase in the intensity of UV radiation reaching the Earth? 
TLS Online TPP Program

#Question id: 32139

#Unit 1. Molecules and their Interaction Relevant to Biology

The core of the helix consists of the base pairs that stack together through