In proteins, there are three types of chromophores relevant for UV/Vis spectroscopy:

peptide bonds (amide bond);

certain amino acid side chains (mainly tryptophan and tyrosine); and

certain prosthetic groups and coenzymes (e.g. porphyrine groups such as in haem).

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#Id: 486

#Unit 2. Cellular Organization

MARs are AT rich heterochromatic regions which contains cis-acting sites that regulate transcription, 5’ introns, and a recognition site for topoisomerase II is usually present in the MAR.

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#Id: 5934

#Unit 10. Ecological Principles

Functional webs which emphasize the most important links in the food web. Line thickness relates to the importance of a link, which may or may not describe energy flow.

 

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#Id: 4237

#Unit 12. Applied Biology

Hayflick limit of animal cell culture

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#Id: 1244

#Unit 7. System Physiology – Animal

GHRH- Hypothalamus stimulates growth hormone secretion by utilizing both cAMP and IP3/Ca2+ as second messengers.

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#Id: 7550

#Unit 6. System Physiology – Plant

In the absence of gibberellin, the DELLA proteins positively regulate GID1, GA20ox, and GA3ox (plus signs), and negatively regulate GA2ox (minus sign). Conversely, both bioactive gibberellin and the GID1 receptor enhance DELLA repressor degradation (plus signs), while GA2ox blocks DELLA repressor degradation (minus signs).