TLS Online TPP Program

#Question id: 6953


Maternal factors are:

#Unit 5. Developmental Biology
  1. energy rich proteins and lipids packaged into the vegetal pole
  2. mRNAs and proteins packaged into the egg by the mother, which act to control early development in the embryo
  3. genes contributed to the embryo by the maternal haploid genome
  4. components of the cortical granules which prevent polyspermy
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TLS Online TPP Program

#Question id: 21143

#Unit 12. Applied Biology

Polyketides are a class of natural products derived from___

TLS Online TPP Program

#Question id: 3671

#Unit 3. Fundamental Processes

_____________ promotes recombination between specific sites on the plasmid if the same site occurs more than once in the molecule, as it would in a dimer or multimer.

TLS Online TPP Program

#Question id: 4135

#Unit 3. Fundamental Processes

In the “activation” of an amino acid for protein synthesis:

TLS Online TPP Program

#Question id: 15853

#Unit 5. Developmental Biology

In XY cells, the early promoter is not active and there is no early Sxl protein because-

TLS Online TPP Program

#Question id: 4114

#Unit 3. Fundamental Processes

Splice-site recognition is prone to two kinds of errors. First, splice sites can be skipped, with components bound at, for example, a given 5’ splice site pairing with those at a 3’ site beyond the correct one. Ways in which the accuracy of splice-site selection can be enhanced are as

A. The factors that recognize that site are transferred from the polymerase carboxy-terminal “tail” onto the RNA. Once in place, the 5’ splice site components are poised to interact with those other factors that bind to the next 3’ splice site to be synthesized.

B. SR (serine–arginine-rich) proteins bind to sequences called exonic splicing enhancers (ESEs) within the exons. SR proteins bound to these sites recruit the splicing machinery to the nearby splice sites to ensure correct splicing

C. By recruiting splicing factors to each side of a given exon, this process encourages the so-called “exon definition, contribute to correct splicing

D. Alternative splicing is intentional missplicing mechanism

Which of the following is INCORRECT?