Practice Questions

TLS Online TPP Program

#Question id: 7245

Gradients of Wnt are essential for normal regeneration of a head and a tail by planaria. Which one of the following statement is incorrect?

#Unit 5. Developmental Biology

In the absence of all Wnt signaling, caused by treatment of the excised body fragment with an inhibitory RNA specific for β-catenin, a two-headed planarian is regenerated.
In the absence of Notum signaling, caused by treatment with an inhibitory RNA specific for Notum, a two-tailed planarian is regenerated; in this case, Wnt is present and active at both the anterior and posterior wounds, and thus two tails are formed.
In the absence of both Wnt and Notum signaling, caused by treatment with inhibitory RNAs for both β-catenin and Notum, the phenotype is similar to that caused by the loss of Notum alone.
In the absence of both Wnt and Notum signaling, caused by treatment with inhibitory RNAs for both β-catenin and Notum, the phenotype is similar to that caused by the loss of Wnt alone.

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TLS Online TPP Program

#Question id: 10631

#Unit 10. Ecological Principles

To estimate the number of foxes m an area, a researcher conducted a mark-recapture survey. In the fast survey, he caught and marked 90 foxes. In his second survey a week later, he caught 120 foxes of which 40 were marked (recaptures). If you are told that the actual number of foxes in this area is 400, which of the following is a plausible explanation for the anomaly in the researcher's data?

TLS Online TPP Program

#Question id: 11398

#Unit 9. Diversity of Life Forms

Assuming that each of these possesses a cell wall, which prokaryotes should be expected to be most strongly resistant to plasmolysis in hypertonic environments?

TLS Online TPP Program

#Question id: 28889

#Unit 4. Cell Communication and Cell Signaling

Which tumor suppressor protein is held together with cytosolic destruction complex targeted for degradation of β-catenin?

TLS Online TPP Program

#Question id: 19130

#Unit 12. Applied Biology

The biological component is suitably immobilized on to the transducer by which ways.

1. Enzymes are immobilized by glutaraldehyde

2. Porous sheet like lens tissue paper or nylon net fabric are used

3. Transducer surface may not be covalently linked to this cross-linked siloxane

Which of the statements is incorrect?