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TLS Online TPP Program

#Question id: 5227

One of the characteristics of retrotransposons is that

#SCPH28 | Zoology

  1. they code for an enzyme that synthesizes DNA using an RNA template.

  2. they are found only in animal cells.

  3. they generally move by a cut-and-paste mechanism.

  4. they contribute a significant portion of the genetic variability seen within a population of gametes.

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TLS Online TPP Program

#Question id: 5026

#SCPH06 I Botany

Whatever its ultimate cause(s), the Cambrian explosion is a prime example of
TLS Online TPP Program

#Question id: 23246

#SCPH01 Biochemistry

Which element in the Sanger sequencing actually terminates the chain elongation?
TLS Online TPP Program

#Question id: 8296

#SCPH28 | Zoology

Giardia intestinalis can cause disease in several different mammalian species, including humans. Giardia organisms (G. intestinalis) that infect humans are similar morphologically to those that infect other mammals, thus they have been considered a single species. However, G. intestinalis has been divided into different subgroups based on their host and a few other characteristics. In 1999, a DNA sequence comparison study tested the hypothesis that these subgroups actually constitute different species. The following phylogenetic tree was constructed from the sequence comparison of rRNA from several subgroups of G. intestinalis and a few other morphologically distinct species of Giardia. The researchers concluded that the subgroups of Giardia are sufficiently different from one another genetically that they could be considered different species.


According to the phylogenetic tree in the figure above, G. intestinalis constitutes a ________ group.
TLS Online TPP Program

#Question id: 3880

#SCPH01 Biochemistry

Which one of the following properties of the L-19 IVS ribozyme is not shared with enzymes that are purely protein?
TLS Online TPP Program

#Question id: 18662

#SCPH01 Biochemistry

Which of the following method is particularly useful for separating isoenzymes, which are different forms of the same enzyme, often differing by only one or two amino-acid residues.