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TLS Online TPP Program

#Question id: 13163

Following statements are regarding to the interaction between β2-adrenergic receptor and G- protein.

#Unit 4. Cell Communication and Cell Signaling
  1. Binding of ligand to the receptor induces major conformational changes in which there are substantial movements of transmembrane helices 5 and 6 and changes in the structure of the C3 loop; together, these changes create a surface that can bind to a segment of the Gα subunit and when unbound by ligand, the receptor has no surface that is complementary to the G protein and thus cannot bind to it.
  2. Binding of ligand to the receptor induces major conformational changes in which there are substantial movements of transmembrane helices 1 and 4 and changes in the structure of the C3 loop; together, these changes create a surface that can bind to a segment of the Gα subunit and when unbound by ligand, the receptor has no surface that is complementary to the G protein and thus cannot bind to it.
  3. Binding of ligand to the receptor induces major conformational changes in which there are substantial movements of transmembrane helices 5 and 6 and changes in the structure of the C3 loop; together, these changes have no surface that can’t bind to a segment of the Gα subunit and when unbound by ligand, the receptor creates a surface that is complementary to the G protein and thus can bind to it.
  4. Binding of ligand to the receptor induces major conformational changes in which there are substantial movements of transmembrane helices 3, 5, 6 and 7 and changes in the structure of the E2 loop; together, these changes create a surface that can bind to a segment of the Gα subunit and when unbound by ligand, the receptor has no surface that is complementary to the G protein and thus cannot bind to it.
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TLS Online TPP Program

#Question id: 26446

#Unit 3. Fundamental Processes

Which of the following is a universal marker for double strand breaks
TLS Online TPP Program

#Question id: 23527

#General Aptitude

Humans interfere with the natural phosphorus cycle by
TLS Online TPP Program

#Question id: 27557

#Unit 1. Molecules and their Interaction Relevant to Biology

Name the amino acid which is associated with C2H2 zinc finger
TLS Online TPP Program

#Question id: 5714

#Unit 8. Inheritance Biology

Homologous chromosomes pair in prophase I as a following way, if crossing over occur between P and Q gene of homologous chromosome?

Which of the following consequence of above abnormality?

A. Dicentric chromosome visible at anaphase I

B. Results in formation of acentric chromatid

C. Recombinant gamete unable to produced viable progeny due to missing of many gene

D. Resulting recombinant gamete become aneuploid 
TLS Online TPP Program

#Question id: 4890

#Unit 8. Inheritance Biology

A strain of Neurospora crassa, unable to synthesize the vitamin thiamine (t), is crossed with a strain that cannot synthesize the amino acid arginine (a). What information can be obtained from the resultant frequencies of ascospore patterns?

 A) The two loci (a) and (t) are independent assortment of each other

B) Both genes are closely linked to their respective centromeres.

C) no crossovers occurred between either gene and its centromere.

D) These two gene may reside on different chromosomes.