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#Question id: 7260

There are maternally-determined variations along the animal-vegetal axis that are necessary for normal development in sea urchin. Which of the following statements about regulation in sea urchin embryos is consistent with that fact?

#Unit 5. Developmental Biology
  1. Up until the hatching of the embryo as a pluteus larva, any blastomere can be separated from the others and will regulate to go on and develop into a fully formed and full size larva.
  2. Up until the hatching of the embryo as a pluteus larva, any blastomere can be separated from the others and will regulate to go on and develop into a fully formed, yet smaller, larva.
  3. Blastomeres from the animal or vegetal poles of the embryo can be isolated and will go on to form an embryo, as long as either an animal or vegetal pole is included.
  4. Blastomeres at the 4-cell stage each still possesses a portion of the original animal-vegetal axis, and if isolated will go on to form a fully formed, yet smaller, larva.
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#Question id: 15269

#Unit 13. Methods in Biology

The protein concentration in DNA extraction sample measured by
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#Question id: 6580

#General Aptitude

Which term comes next in the sequence : 2, A, 9, B, 6, C, 13, D, ? 
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#Question id: 3700

#Unit 3. Fundamental Processes

In the Meselson-Stahl DNA replication experiment, if the cells were first grown for many generations in 15N containing media, and then switched to 14N containing media, what percent of the DNA had 1 light strand and 1 heavy strand after 2 generations of growth in 15N growth media?
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#Question id: 1839

#Unit 4. Cell Communication and Cell Signaling

The first production of live but non-virulent forms of chicken cholera bacillus was achieved by:
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#Question id: 4169

#Unit 3. Fundamental Processes

The first amino acid incorporated into proteins __.