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TLS Online TPP Program

#Question id: 7297

How is the ABC model for floral identity in Arabidopsis similar to the models for homeotic gene function derived from studies in Drosophila?

#SCPH28 | Zoology
  1. The key resposnsibility of homeotic genes in both is patterning of dorsal-ventral asymmetry.
  2. In both organisms, one homeotic gene is expressed at the two ends, a second expressed in to domains more central to that of the first and a third expressed more centrally, thus contributing unambiguous identities to all regions of the organism.
  3. In both organisms, homeotic genes interact, so that it is often the combination of genes present that is critical in specifying structure in adult.

  4. The ABC model of Arabidopsis is essentially identical to the Drosophila model for homeotic gene function, in that the Drosophila version of the A gene is abdominal-A, the Drosophila version of the B gene is Abdominal-B, and the Drosophila version of the C gene is Ultrabithorax.

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#Question id: 5018

#SCPH28 | Zoology

Which event is nearest in time to the end of the period known as snowball Earth?
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#Question id: 4364

#SCPH28 | Zoology

A researcher found a method she could use to manipulate and quantify phosphorylation and methylation in embryonic cells in culture. One of her colleagues suggested she try increased methylation of cytosine (C) nucleotides in the DNA of promoters of a mammalian system. Which of the following results would she most likely see?
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#Question id: 18634

#SCPH05 I Biotechnology

Number of rooted trees in a phylogeny of five sequences is –
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#Question id: 773

#SCPH01 Biochemistry

Which of the following describes the function of an enzyme known as Dicer?
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#Question id: 16099

#SCPH28 | Zoology

 Following adaptation to a hot climate there is an increase in: