In case of β turns conformation of 

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#Question id: 1626

#Unit 4. Cell Communication and Cell Signaling

The initial complement component activated by complement-fixing antibodies is:

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#Question id: 11163

#Unit 9. Diversity of Life Forms

The reason that paralogous genes can diverge from each other within the same gene pool, whereas orthologous genes diverge only after gene pools are isolated from each other, is that

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#Question id: 2326

#Unit 2. Cellular Organization

The movement of chromosomes during mitosis is due to the:

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#Question id: 16133

#Unit 13. Methods in Biology

You are running a human assisted reproduction clinic and providing state-of-the-art genetic diagnostic services. A married couple who already had a child with cystic fibrosis approach you because they wish to have another child, but only if they can be assured that the child will not have cystic fibrosis. You genotype the woman and discover that she is a heterozygote for Del508, the most common mutation causing cystic fibrosis. You suggest that the couple consider first polar body testing, in which several unfertilized oocytes (each with its first polar body) are retrieved from the woman, the first polar bodies are removed, and PCR tests are conducted on DNA from each of the first polar bodies. The couple agrees, and you obtain the following results:

 

Given the couple's desire to have a child without cystic fibrosis, which oocytes would you employ in vitro fertilization?

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#Question id: 1973

#Unit 4. Cell Communication and Cell Signaling

Clonal selection is an explanation for how