TLS Online TPP Program

#Question id: 2185


Which amino acids would most likely reside in the membrane-anchoring domain of a membrane-embedded protein?

#Unit 2. Cellular Organization
  1. isoleucine, valine, and phenylalanine

  2. phenylalanine, valine, and aspartate

  3. leucine, threonine, and lysine

  4. lysine, arginine, and histidine

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TLS Online TPP Program

#Question id: 14497

#Unit 13. Methods in Biology

In a throw of 3 dice the probability that at least one die shows up 1 is

TLS Online TPP Program

#Question id: 8776

#Unit 9. Diversity of Life Forms

What kind of evidence has recently made it necessary to assign the prokaryotes to either of two different domains, rather than assigning all prokaryotes to the same kingdom?

TLS Online TPP Program

#Question id: 26501

#Unit 3. Fundamental Processes

Splice sites are directional in nature

TLS Online TPP Program

#Question id: 24459

#Unit 7. System Physiology – Animal

The correct sequence of events involved in phototransduction in rods and cones in response to light is:

TLS Online TPP Program

#Question id: 4103

#Unit 3. Fundamental Processes

In a biochemical experiment, you compare the products from splicing reactions carried out in vitro using three different substrates. In each case the substrate is a construct containing a single intron surrounded by two exons, and in all cases the construct is the same overall size. But in one case, the intron is a group I intron, in another a group II intron, and in the third an intron removed by the spliceosome. Each construct is labelled in a manner that allows it to be detected after gel electrophoresis, and each is tested in two reactions—one, conditions that support self-splicing, and two, in the presence of nuclear extract as well. Note that, for simplification, only the final products of the splicing reaction are seen, but before degradation of the introns.

 Which of the following observation is/are correct?

A. In lane A, the presence of nuclear abstract, a band for the lariat and the spliced product and pre-mRNA.

B. Lane B shows Group I Introns and Lane C is for Group II introns and reaction is nonself-splicing

C. Lane C is Group I intron. Splicing takes place in the absence and presence of nuclear abstract, and the reaction is self-splicing.