A couple requests blood typing of their 2-year-old child (father AB, Rh-negative; mother B, Rhnegative). Results of hemagglutination assays of the child’s blood are shown in the next figure. Which of the following conclusions concerning the child’s parentage is valid?

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#Question id: 23244

#SCPH01 Biochemistry

At which position does this piperidine cleaves?

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#Question id: 8692

#SCPH05 I Biotechnology

Which of the following statements is accurate with regard to a phylogeny, as represented by a phylogenetic tree?

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#Question id: 12912

#SCPH05 I Biotechnology

Name the enzyme which separates the double-helical DNA into single strands.

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#Question id: 11411

#SCPH06 I Botany

Vulnerability to extinction can be linked to species following characteristics. Which of the following statement are correct?

 A. Rare species are more prone to extinction than common ones.

 B. Species that are capable of migrating between fragments of habitat, such as between mainland areas and islands, may be more resistant to extinction

 C. Organisms that are specialists are more likely to go extinct

 D. Species with naturally long life spans may be more likely to become extinct

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#Question id: 607

#SCPH05 I Biotechnology

In E. coli ________ is an activator and ________ is a negative allosteric modulator of the enzyme phosphofructokinase-1.