In single factor crosses between two true breeding strains of tree frog, a scientist discovers that plain green tree frogs and tree frogs with a red 'racing stripe' always produce offspring that have red racing stripes. Why?

#Question id: 12322

#Unit 10. Ecological Principles

#Question id: 24155

#General Aptitude

#Question id: 5535

#Unit 5. Developmental Biology

What type of animal forms a trophoblast for the duration of its early development?

#Question id: 5767

#Unit 8. Inheritance Biology

 An enzyme that repairs thymine dimers in visible light in E. coli

#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?