Chromatin-mediated repression of transcription involves

a. modification of lysine residues in histones. 

b. large, multiprotein complexes.

c. acetylation of histone tails.   

d. deacetylation of histone tails.

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#Question id: 7141

#Unit 5. Developmental Biology

Engrailed comes to be expressed in posterior compartments during Drosophila embryogenesis; what is the consequence of engrailed activation of hedgehog (Hh) signaling from the posterior compartment of the wing disc?

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#Question id: 26567

#Unit 3. Fundamental Processes

E(var) mutations lie in genes whose products are needed to activate gene expression. They include members of 

TLS Online TPP Program

#Question id: 32353

#Unit 1. Molecules and their Interaction Relevant to Biology

The principal form in the brain of Hexokinase is 

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#Question id: 727

#Unit 1. Molecules and their Interaction Relevant to Biology

26-residue peptide composed of alanine and leucine shows a circular dichroism (CD) spectrum characteristic of α-helix at 50°C in 5 mM phosphate buffer at pH 7.4. When the peptide solution is cooled gradually to 25°C, and the CD spectra are recorded at different temperatures, the most likely observation will be that

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#Question id: 5693

#Unit 8. Inheritance Biology

Type of nondisjunction leads to regions of tissue with different chromosome constitutions, a condition known as mosaicism is due to