The hypostome acted as an “organizer” of the hydra. This notion has been confirmed by:

A. when transplanted, the hypostome can induce host tissue to form a second body axis.

B. the hypostome do not produces the head inhibition signal.

C. the hypostome is the only “self-differentiating” region of the hydra.

D. the hypostome produces a “head activation signal” that suppresses the formation of new organizing centers.

Which one of the following combinations are incorrect?

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#Question id: 5700

#Unit 8. Inheritance Biology

During meiosis, homologous chromosomes pair up along their lengths. The most plausible explanation for the karyotype structure shown above is that

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#Question id: 16131

#Unit 13. Methods in Biology

You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.              

 How many units of ß-galactiosidase would you expect to be expressed from deletion 4 in a gln2– mutant?

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#Question id: 2723

#Unit 2. Cellular Organization

With respect to the solenoid model of nucleosome, which of the following is true?

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#Question id: 28621

#Unit 2. Cellular Organization

Substrate-targeting subunits of the APC/C recognize specific sequence motifs on the proteins that the APC/C ubiquitinates. One motif the destruction box or D-box, has the consensus sequence is___

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#Question id: 1569

#Unit 4. Cell Communication and Cell Signaling

A bacterium entering the body through a small cut in the skin will do which of the following?