TLS Online TPP Program

#Question id: 19692


What does ST interval show on ECG?

#Unit 13. Methods in Biology
  1. plateau portion of the ventricular action potential
  2. an isoelectric portion of the ECG that corresponds to AV node conduction
  3. plateau portion of the Atrial action potential
  4. Depolarization initiated in the SA node
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TLS Online TPP Program

#Question id: 385

#Unit 1. Molecules and their Interaction Relevant to Biology

In which reaction below does water not participate as a reactant (rather than as a product)?

TLS Online TPP Program

#Question id: 1234

#Unit 4. Cell Communication and Cell Signaling

Which of the following mutations would likely have a similar cancer-promoting effect as the RasD mutation?

a. mutation in Grb2 so that it cannot bind Sos

b. mutation in Sos so that it binds Ras independent of Grb2

c. mutation in GAP so that it cannot bind Ras

d. mutation in EGF receptor so that it binds GRB2 independent of EGF

TLS Online TPP Program

#Question id: 4913

#Unit 8. Inheritance Biology

Which one of the following statements is INCORRECT about cytoplasmic inheritance?

TLS Online TPP Program

#Question id: 5733

#Unit 8. Inheritance Biology

In individuals heterozygous for a chromosome inversion, the homologous chromosomes form a loop in prophase I of meiosis.

Which of the following is effect of inversion?

A. A dicentric and an acentric chromosome in meiosis I as the chiasmata gets terminated when inversion includes centromere  

B. Appearance of deletion and duplication in both the cross over products chromosomes when centromere outside of inversion region  

C. All recombinant gamete are non-viable gametes when single crossing over within inverted region; irrespective to paracentric or pericentic inversion

D. Nonviable gametes are usually produced, resulting in a depression in observed recombination frequencies.

Which of the above statements are correct?

TLS Online TPP Program

#Question id: 26481

#Unit 2. Cellular Organization

Which of the following are the characteristics of prokaryotic operator O1
a. Made up of 21-bp sequence 
b. It has twofold/dyad symmetry 
c. Recognized by two subunits of Lac repressor
d. On each O1 four unit of Lac repressor binds