Which era is known as the ʺage of reptilesʺ?

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#Question id: 3002

#I Life Science/ Life Sciences Group – I-V

Cells are most sensitive to penicillin during which phase of the growth curve?

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#Question id: 749

#SCPH28 | Zoology

Which of the following is correct for the A form of DNA structures?

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#Question id: 2931

#SCPH28 | Zoology

Which of the following is a substrate of Cln3-Cdc28?

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#Question id: 968

#SCPH28 | Zoology

In the urea cycle which molecule is transported from the mitochondrial matrix to the cytosol as ornithine is transported in the opposite direction?

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#Question id: 16132

#SCPH06 I Botany

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:

 

the observation that the polar bodies for oocytes #1 and #5 test positive for both Del508 and the wild type sequence, because