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TLS Online TPP Program

#Question id: 8682

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


Which of the following changes would a modern systematist be most likely to make after learning of the results of the rRNA analyses?

#SCPH06 I Botany
  1. continue to keep subgroups A-D as members of the species G. intestinalis
  2. break the species G. intestinalis into four separate species, A, B, C, and D
  3. combine subgroup D and G. microti into one species
  4. combine all the subgroups of G. intestinalis (A-D) and G. microti to make one species
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TLS Online TPP Program

#Question id: 14803

#I Life Science/ Life Sciences Group – I-V

The percentage SIMILARITIES and IDENTITIES, respectively, between the two peptide sequences given below will be ______% and _____%.

Peptide I :
Ala-Ala-Arg-Arg-Gln-Trp-Leu-Thr-Phe-Thr-Lys-Ile-Met-Ser-Glu

Peptide II:
Ala-Ala-Arg-Glu-Gln-Tyr-Ile-Ser-Phe-Thr-Lys-Ile-Met-Arg-Asp
TLS Online TPP Program

#Question id: 11144

#SCPH28 | Zoology

The membrane potential in which there is no net movement of the ion across the membrane is called the ________.
TLS Online TPP Program

#Question id: 14333

#SCPH05 I Biotechnology

A cylindrical bioreactor of diameter 3 m has four baffles. A Rushton turbine mounted in the reactor has a diameter one third the tank diameter and is operated at a speed of 90 rpm. The density of the fluid is approximately I g cm-3. The reactor is used to culture an anaerobic organism that does not require gas sparging. The broth can be assumed Newtonian. As the cells grow, the viscosity of the broth increases. when the viscosity is 1000 times greater than water, estimate the power required to achieve turbulence.
TLS Online TPP Program

#Question id: 8952

#SCPH28 | Zoology

The blastopore is a structure that first becomes evident during
TLS Online TPP Program

#Question id: 10994

#SCPH28 | Zoology

When recording lead II on an EKG, the positive electrode is the