TLS Online TPP Program

#Question id: 31232


Condensin association with chromosomes is facilitated by mitotic CDKs and Aurora B kinase, which phosphorylates 

#Unit 2. Cellular Organization
  1. Histone H2A
  2. Histone H2B
  3. Histone H3
  4. Histone H1
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TLS Online TPP Program

#Question id: 5641

#Unit 5. Developmental Biology

The fate map of the arabidopsis embryo at the heart stage indicates that:

TLS Online TPP Program

#Question id: 5642

#Unit 5. Developmental Biology

One of the earliest events in arabidopsis development is formation of the _____ axis, in response to a gradient of _____.

TLS Online TPP Program

#Question id: 5643

#Unit 5. Developmental Biology

The genetic analysis of arabidopsis development was strongly influenced by genetic analysis of Drosophila development, and as is the case in Drosophila, genes that influence development are often named for:

TLS Online TPP Program

#Question id: 5644

#Unit 5. Developmental Biology

If embryos are disaggregated with chemicals or proteases, and the individual cells are mixed together in culture, what will happen?

TLS Online TPP Program

#Question id: 5645

#Unit 5. Developmental Biology

A reproductive difference between sea urchins and humans is ________.

TLS Online TPP Program

#Question id: 5646

#Unit 5. Developmental Biology

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?