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TLS Online TPP Program

#Question id: 28858

Which of the following kinesin is a C-terminal kinesin & travel toward the microtubule minus end?

#Unit 2. Cellular Organization
  1. Kinesin-1
  2. Kinesin-2
  3. Kinesin-13
  4. Kinesin-14
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TLS Online TPP Program

#Question id: 12386

#Unit 7. System Physiology – Animal

Which of the following changes would you expect to find in a patient who developed acute renal failure after ingesting poisonous mushrooms that caused renal tubular necrosis?
TLS Online TPP Program

#Question id: 5252

#Unit 8. Inheritance Biology

Which type(s) of genetic transfer lead to incorporation of new DNA into the bacterial chromosome?

I. Conjugation mediated by F factor

II. Hfr mediated conjugation

III. Transduction

IV. Transformation
TLS Online TPP Program

#Question id: 2863

#Unit 2. Cellular Organization

The promoter of the araBAD operon from E. coli is activated in the presence of arabinose and the absence of glucose and directs expression of genes encoding enzymes required for arabinose metabolism. Unlike the cases of lac and gal genes, where a repressor and an activator work together, here two activators work together: AraC and CAP

+ arabinose

AraC binds that sugar and adopts a configuration that allows it to bind DNA as a dimer to the adjacent half-sites, araI1 and araI2

– arabinose

the AraC dimer adopts a different conformation and binds to araO2 and araI1, there is no monomer at site araI2, and so the protein cannot activate the araBAD promoter (araPBAD). This promoter is also controlled by CAP.

TLS Online TPP Program

#Question id: 15653

#Unit 13. Methods in Biology

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. You have isolated a mutation that causes constitutive melibiase activity, which you designate MelA–. P1 phage mapping experiments using a Tn5 insertion linked to Mel1 show that MelA– is not linked to Mel1. Moreover you find that when an amber suppressor is introduced into a MelA– mutant, normal melibiase regulation is restored. Classify the MelA– mutation on the basis of genetic properties,  make a proposal for the type of regulatory functions affected by the MelA– mutation?
TLS Online TPP Program

#Question id: 29029

#Unit 11. Evolution and Behavior

zoologist Konrad Lorenz described, in which he took very young ducks fixes its attention on himself as first thing of young ones with which it has seen, and seeing that, there after these ducks follow him. this type of behaviour known as___