Steric Hindrance and Combinations of Major and Minor Splice Sites are major reasons behind alternative splicing (Mutually Exclusive Splicing) 

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#Id: 8956

#Unit 11. Evolution and Behavior

Mixtures of exons duplicated from genes with different functions can generate new genes with new functions, a process that is called exon shuffling.

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#Id: 6305

#Unit 3. Fundamental Processes

The E. coli rrn promoters are also regulated by a pair of small molecules: the initiating NTP (the iNTP) and an alarmone,  guanosine 5 -diphosphate 3-diphosphate (ppGpp). An abundance of iNTP indicates that the concentration of  nucleotides is high, and therefore it is appropriate to synthesize plenty of rRNA. 

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#Id: 3354

#Unit 3. Fundamental Processes

In photoreactivation, the enzyme DNA photolyase captures energy from light and uses it to break the covalent bonds linking adjacent pyrimidines.

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#Id: 7177

#Unit 5. Developmental Biology

The ectoderm is induced to become epidermal tissue by BMPs

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#Id: 8083

#Unit 1. Molecules and their Interaction Relevant to Biology