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TLS Online TPP Program

#Question id: 8680

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


By examining the phylogenetic tree diagrammed in the figure above, what conclusion can you draw about the species G. microti?

#SCPH06 I Botany
  1. It evolved before G. intestinalis.
  2. It is more closely related to G. muris than to G. intestinalis.
  3. It should not be labeled a species distinct from G. intestinalis.
  4. It is part of a monophyletic group that also includes G. intestinalis.
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TLS Online TPP Program

#Question id: 19337

#SCPH28 | Zoology

Which one of the following is a type of cancer biomarker?
1. Prostate-specific antigen
2. Hydrogen peroxide
3. Epidermal growth factor receptor
Which of the following options is/are correct?
TLS Online TPP Program

#Question id: 4815

#SCPH28 | Zoology

The cross over percentage between linked genes J and M is 20%, J and L is 35%, J and N is 70%, L and K is 15%, M and N 50%. The sequence of genes on the chromosome is
TLS Online TPP Program

#Question id: 4828

#SCPH12 I Genetics

Consider two pairs of alleles, G/g and H/h, that follow complete dominance inheritance. The initial cross consisted of GG hh males and gg HH females, and the F I female progeny were test crossed with gg hh males to produce 380 Gghh progeny out of 1000 total progeny. What is approximate distance between Gene G and H.
TLS Online TPP Program

#Question id: 7294

#SCPH28 | Zoology

Multiple factors regulate flowering in Arabidopsis. FT mRNA is expressed in companion cells of the leaf vein in response to multiple signals, including day length, light quality, and temperature. FT moves in the phloem from leaves to the apical meristem. FT is unloaded from the phloem in the meristem and interacts with FD.

FT-FD complex activates multiple genes. Which of the following combination is correct?(SS)
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#Question id: 11989

#SCPH28 | Zoology

If mayflies lay eggs on roads instead of in water, this behavior could involve which of the following?