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TLS Online TPP Program

#Question id: 13159

How signaling is involved in ensuring that yeast cells fuse only with cells of the opposite mating type?

#Unit 4. Cell Communication and Cell Signaling
  1. The two cells of opposite mating type (a and alpha) each secrete a certain signaling molecule, which can only be bound by receptors carried on cells of the opposite mating type. Thus, the a mating factor cannot bind to another a cell and cause it to grow toward the first a cell. Only an alpha cell can “receive” the signaling molecule and respond by directed growth.
  2. The two cells of opposite mating type (a and alpha) each secrete a certain signaling molecule, which can only be bound by receptors carried on cells of the same mating type. Thus, the a mating factor can bind to another a cell and cause it to grow toward the first a cell.
  3. The two cells of opposite mating type (a and alpha) each proteins attached to the plasma membrane of one cell can interact directly with cell-surface receptors on adjacent cells. Thus, the a mating factor can directly bind to another a cell and cause it to grow.
  4. The two cells of opposite mating type (a and alpha) each respond to substances that they themselves release.
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TLS Online TPP Program

#Question id: 4447

#Unit 3. Fundamental Processes

Sequences in the direction in which transcription proceeds are referred to as __?from the start site, and allotted a? value.
TLS Online TPP Program

#Question id: 4448

#Unit 3. Fundamental Processes

Three defined steps in a transcription cycle; choose correct one

1a. Closed complex

In this form, the DNA remains double-stranded, and the enzyme is bound to one face of the helix. I

1b. Open complex

In which the DNA strands separate over a distance of 13 bp around the start site to form the transcription bubble. In the next stage of initiation,

2. Promoter escape

Incorporation of the first 10 or so ribonucleotides is a rather inefficient process, and at that stage, the enzyme often releases short transcripts and then begins synthesis again

3. Initial transcribing complex.

Once an enzyme makes a transcript longer than 10 nucleotides, it is said to have

TLS Online TPP Program

#Question id: 4449

#Unit 3. Fundamental Processes

Promoters recognized by polymerase containing s70 share the following characteristic structure;
TLS Online TPP Program

#Question id: 4450

#Unit 3. Fundamental Processes

According to the correlation between promoter strength and sequence, in all these promoters which one is seems like very weak promoter or non-existing in any organism
TLS Online TPP Program

#Question id: 4451

#Unit 3. Fundamental Processes

Promoter consensus sequence was derived by aligning 300 sequences known to function as s70 promoters and ascertaining the most common base found at each position in the –35 and –10 hexamers are,
TLS Online TPP Program

#Question id: 4452

#Unit 3. Fundamental Processes

A final DNA element that binds RNA polymerase is sometimes found just downstream from the –10 element. This element is called the