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TLS Online TPP Program

#Question id: 1104

Which of the following statements is true of signal molecules?

#Unit 4. Cell Communication and Cell Signaling

  1. When signal molecules first bind to receptor tyrosine kinases, the receptors phosphorylate a number of nearby molecules.

  2. In response to some G protein-mediated signals, a special type of lipid molecule associated with the plasma membrane is cleaved to form IP3 and calcium.

  3. In most cases, signal molecules interact with the cell at the plasma membrane, enter the cell, and eventually enter the nucleus.

  4. Protein kinase A activation is one possible result of signal molecules binding to G protein coupled receptors.

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TLS Online TPP Program

#Question id: 4994

#Unit 11. Evolution and Behavior

In certain motile prokaryotes, dozens of different proteins comprise the motor that powers the prokaryotic flagellum. The motor has a complicated structure, and its various proteins interact to carry out its function. Based on Darwinʹs explanation for the existence of human eyes, how would he probably have explained the existence of such motors?
TLS Online TPP Program

#Question id: 7513

#General Aptitude

A boat travels upstream from Q to P and downstream from p to Q in 3 h. If the distance between P to Q is 4 km and the speed of the current is 1 km/h , then what is the speed of the boat in still water?
TLS Online TPP Program

#Question id: 2578

#Unit 2. Cellular Organization

Following statements are regarding to proteins which involve actin filament assembly.

A. To nucleate the assembly of branched actin, Arp2/3 needs to be activated by interacting with a nucleation promoting factor (NPF), in addition to associating with the side of a pre-existing actin filament.

B. The NPF WASp is inactive due to an intramolecular interaction that masks the WCA domain.

C. Two NPFs each bind an actin subunit at their WH2 domains, and together, they activate the Arp2/3 complex through its interaction with their connector and acidic domains.

D. The NPF WASp is activated by a coincidence detection mechanism by which intramolecular interaction in WASp is relieved, allowing the W domain to bind actin and the acidic A domain to activate the Arp2/3 complex.

Which of the following statements represents regulation of the Arp2/3 complex by NPF?
TLS Online TPP Program

#Question id: 26508

#Unit 3. Fundamental Processes

Which of the following are true regarding the splicing of tRNA 
a.RnaseP cuts at 5’ end 
b.RnaseD cuts at 3’ end 
c.Base modification followed by CCA addition by specific polymerase
d.And then final script of 78 bp formed
TLS Online TPP Program

#Question id: 23670

#Unit 13. Methods in Biology

How might infection of a plant by E. coli transformed with a recombinant Ti plasmid be used to have a new gene (e.g. insect toxin) expressed in all cells of the plant?