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TLS Online TPP Program

#Question id: 7110

What may be the molecular trigger that causes cells in the presomitic mesoderm to finally condense into somites?

#Unit 5. Developmental Biology

  1. A gradient of retinoic acid exists that emanates both anteriorly and posteriorly from the somites.

  2. The FGF gradient drops off in the region that is forming somites.

  3. Periodic waves of c-hairy1 are expressed in the presomitic mesoderm, such that cells in the more anterior somites will have been exposed to fewer waves of c-hairy1 than the cells in more posterior somites.

  4. Signaling from the receptor Notch is required for somite formation.
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TLS Online TPP Program

#Question id: 26496

#Unit 3. Fundamental Processes

Two transesterification reactions takes place for 2 exon -1 intron configuration. Choose the correct  statement
a. First transesterification is always caused by exon 1 -3’OH
b. second transesterification is catalysed variably either by external G or branch point while .
c. First transesterification is catalysed variably either by external G or branch point while 
d. second transesterification is always caused by exon 1 -3’OH.
TLS Online TPP Program

#Question id: 26497

#Unit 3. Fundamental Processes

There are three type of Splicing signals 1. Major U2-type or GU-AG introns 2. Minor U12-type or AU-AC introns & 3. Minor U12-type with GU-AG introns (hybrid type), which of the following is responsible for the recognition of branch point sequence UACUAAC?
TLS Online TPP Program

#Question id: 26498

#Unit 3. Fundamental Processes

Which of the following shows correct bond pattern in Lactose and Allolactose
TLS Online TPP Program

#Question id: 26499

#Unit 3. Fundamental Processes

There are three type of Splicing signals 1. Major U2-type or GU-AG introns 2. Minor U12-type or AU-AC introns & 3. Minor U12-type with GU-AG introns (hybrid type), which of the following is responsible for the recognition of branch point sequence UACUAAC?
TLS Online TPP Program

#Question id: 26500

#Unit 3. Fundamental Processes

Choose the correct statement 
1.UACUAAC is branch point sequence for U2 type introns 
2.UACUAAC is branch point sequence for U12 type introns
3.CCUUAAC is branch point sequence for U12 type introns
4.CCUUAAC is branch point sequence for U2 type introns
TLS Online TPP Program

#Question id: 26501

#Unit 3. Fundamental Processes

Splice sites are directional in nature